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549 lines
16 KiB
549 lines
16 KiB
// Pinout configuration
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const int grinderPin = 9, pumpPin = 8, boilerPin = 6, powderPin = 7, wheelPin = 10, invertWheelPin = 11, powderSensorPin = 2, vaporSensorPin = 5, tempSensorPin = A7, wheelStartSensorPin = 4, wheelEndSensorPin = 3, redLED = 13, greenLED = 12;
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// Global string
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String readString;
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// Thermistor config
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// WARNING! while the old coffee machine used a PTC thermistor, this was replaced with an NTC one as it was more readily available
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// Code must be adjusted accordingly if a PTC resistor is used once more!
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int Vo;
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float R1 = 10000; // <-- change this value to the resistance of the fixed resistor (so don't change PLS!)
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float logR2, R2, T, Tc, Tp, Tstart, Told;
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float c1 = 8.5e-04, c2 = 1.85e-04, c3 = 2e-07; // Here's where you can perform actual calibration
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// Variable to store desired Max boiler Temp
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int desiredTemp = 70;
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// Variables to Store errors:
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int unrecoverableErr = 0;
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int warning = 0;
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int warned = 0; // support variable needed to prevent arduino from making second coffee after refill. this is a shitty hack and resets the board.
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// Variables for cleaning and other maintenance
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int dry = 0;
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int noCoffee = 0;
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// Milliseconds to delay between each cycle
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const int milliseconds = 10;
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int timeratio = 1;
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// pumpRatio is = seconds to pump water for and will be updated over serial
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int pumpRatio = 15; // warning: there is usually ~5s dead time from pump startup to water flowing out of nozzle
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int pumpStatus = 0; // support variable to enable pumping while heating, added feb 24
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// This next variable is used to get current "time" in ms and break out of while cycles that need a time limit safeguard
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unsigned long startTime;
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unsigned long pMillis;
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//_____________________________________________________________________________
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void(* resetFunc) (void) = 0; // declare reset fuction at address 0
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//_____________________________________________________________________________
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void setup() {
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// put your setup code here, to run once:
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// first we set pins as I/O and initialize outputs LOW
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pinMode(boilerPin, OUTPUT); pinMode(pumpPin, OUTPUT); pinMode(grinderPin, OUTPUT); pinMode(powderPin, OUTPUT); pinMode(wheelPin, OUTPUT); pinMode(invertWheelPin, OUTPUT); pinMode (redLED, OUTPUT); pinMode (greenLED, OUTPUT);
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pinMode(powderSensorPin, INPUT); pinMode(vaporSensorPin, INPUT); pinMode(tempSensorPin, INPUT); pinMode(wheelStartSensorPin, INPUT); pinMode(wheelEndSensorPin, INPUT);
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digitalWrite(grinderPin, LOW); digitalWrite(pumpPin, LOW); digitalWrite(boilerPin, LOW); digitalWrite(powderPin, LOW); digitalWrite(wheelPin, LOW); digitalWrite(invertWheelPin, LOW); digitalWrite(redLED, LOW); digitalWrite(greenLED, LOW);
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// timeratio easily allows to determine how many cycles are required to make 1s pass (ms * ratio = 1s)
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timeratio = 1000/milliseconds;
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// initialize serial:
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Serial.begin(9600);
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delay(100);
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Serial.write("Arduino running :)\n");
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}
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//_____________________________________________________________________________
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void loop() {
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// put your main code here, to run repeatedly:
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digitalWrite(greenLED, HIGH);
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// Check if unrecoverable error has occurred:
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if (unrecoverableErr == 1) {
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startTime = millis();
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delay(100);
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Serial.write("Error has occurred.\n"); delay(100); Serial.write("Check machine and restart\n");
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digitalWrite(greenLED, LOW);
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while (true){
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digitalWrite(redLED, HIGH);
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delay(1000);
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digitalWrite(redLED, LOW);
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delay(1000);
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// reset arduino after 30s
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if (millis() - startTime == 30000) {
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break;
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}
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}
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resetFunc(); //call reset.
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}
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// check if data has been sent on serial from ESP or PC:
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if (Serial.available() > 0) {
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// read the incoming data: (we only care about the first few characters, I've chosen 4)
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readString = "";
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serialRead();
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String incomingData = readString.substring(0,4);
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//if (incomingData == "read") {
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//digitalWrite(greenLED, HIGH);
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//}
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if (incomingData == "rist") {
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// set parameters for ristretto:
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delay(100);
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Serial.write("Ristretto\n");
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pumpRatio = 15;
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}
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if (incomingData == "espr") {
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// set parameters for espresso:
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delay(100);
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Serial.write("Espresso\n");
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pumpRatio = 20;
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}
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if (incomingData == "long") {
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// set parameters for lungo:
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delay(100);
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Serial.write("Lungo\n");
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pumpRatio = 25;
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}
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if (incomingData == "amer") {
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// set parameters for lungo:
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delay(100);
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Serial.write("Americano\n");
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pumpRatio = 60;
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}
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// check if the incoming data is "make":
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if (incomingData == "make") {
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// run the code to make coffee:
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delay(100);
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Serial.write("Making some coffee!\n");
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makeCoffee();
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}
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if (incomingData == "dryr") {
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// run the code to make a dry run (no powder, no water):
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delay(100);
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Serial.write("DryRun\n");
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dry = 1;
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makeCoffee();
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}
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if (incomingData == "noco") {
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// run the code to make a dry run (no powder, nor water):
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delay(100);
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Serial.write("NoCo\n");
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pumpRatio = 12;
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noCoffee = 1;
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makeCoffee();
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}
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if (incomingData == "grin") {
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// only grind
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Grind();
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}
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if (incomingData == "pump") {
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// run the code to just pump water:
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pumpRatio = 15;
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Pump();
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}
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if (incomingData == "pres") {
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// only press
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Press();
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}
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if (incomingData == "unpr") {
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// only unpress
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unPress();
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}
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if (incomingData == "heat") {
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// only heat
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desiredTemp = 80;
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Heat();
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}
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if (incomingData == "drop") {
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// only drop
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Drop();
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}
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if (incomingData == "clea") {
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// clean machine
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delay(100);
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Serial.write("s-clean\n");
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dry = 1;
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makeCoffee();
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noCoffee = 1;
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makeCoffee();
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delay(100);
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Serial.write("S-cleaning done.\n");
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}
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}
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// making steam:
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while (digitalRead(vaporSensorPin) == HIGH) {
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desiredTemp = 100;
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Serial.write("Vapor heating\n");
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delay(500);
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Heat(); // Heat the boiler to vapor temperature
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delay(20000);
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if (unrecoverableErr == 1) {
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break;
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}
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}
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delay(milliseconds);
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}
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//_____________________________________________________________________________
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// this is how we read the input
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void serialRead() {
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while (Serial.available()) {
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delay(10);
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if (Serial.available() > 0) {
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char c = Serial.read();
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readString += c;}
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}
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}
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//_____________________________________________________________________________
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void Grind() {
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digitalWrite(greenLED, LOW);
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delay(100);
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Serial.write("grinding...\n");
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digitalWrite(grinderPin, HIGH);
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startTime = millis();
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while (true) {
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delay(milliseconds);
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if (digitalRead(powderSensorPin) == HIGH) {
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digitalWrite(grinderPin, LOW);
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delay(100);
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Serial.write("Grinding Done\n");
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break;
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}
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if (millis() - startTime > 15000) {
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Serial.write("Warning, grinding took too long!\n");
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digitalWrite(grinderPin, LOW);
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delay(100);
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Serial.write("Out of Coffee?\n");
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warning = 1;
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warned = 1;
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break;
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}
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}
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digitalWrite(greenLED, HIGH);
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}
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//_____________________________________________________________________________
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void Drop() {
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digitalWrite(greenLED, LOW);
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delay(100);
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Serial.write("dropping...\n");
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digitalWrite(powderPin, HIGH);
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delay(1000);
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digitalWrite(powderPin, LOW);
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delay(100);
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Serial.write("Dropped\n");
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digitalWrite(greenLED, HIGH);
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}
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//_____________________________________________________________________________
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void Heat() {
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digitalWrite(greenLED, LOW);
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digitalWrite(redLED, HIGH);
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startTime = millis();
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pMillis = startTime; // value to store
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delay(100);
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Serial.write("Heating to ");
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delay(100);
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Serial.print(desiredTemp);
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delay(100);
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// initialize variables at safe values
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Tc = 0; // current temperature
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Tp = -10; // temperature at previous cycle
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Tstart = - 100; // temperature at start of Heat() function
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// monitor temperature and adjust boilerPin as needed:
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while (true) {
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// read temperature from tempSensorPin:
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Vo = analogRead(tempSensorPin);
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R2 = R1 * (1023.0 / (float)Vo - 1.0);
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logR2 = log(R2);
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T = (1.0 / (c1 + c2*logR2 + c3*logR2*logR2*logR2)); // compute temperature from NTC
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Tc = (T - 273.15); // convert from Kelvin to Celsius for readability
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if (millis() - startTime > 500 && millis() - startTime < 1500) {
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Tstart = Tc; // support variable to store temp at beginning, so that we can be sure it's increasing
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delay(1001); // make sure we only set startTime once!
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}
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// check if temperature is within the acceptable range and break out of the loop without error if done heating:
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if (Tc > desiredTemp && pumpStatus == 0) {
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delay(100);
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Serial.write("reached desired temp\n");
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delay(100);
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Serial.print(Tc);
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break; // temperature is within range, break out of the loop:
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}
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if (Tc < -100) { // break the loop if temperature < -100, can only happen if cable gets unplugged
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delay(100);
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Serial.write("u-Thermocouple: unplugged or failed\n");
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unrecoverableErr = 1;
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break;
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}
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if (millis() - startTime > 20000 && Tc - Tstart < 1 && pumpStatus == 0) { // break the loop if temperature is not increasing
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delay(100);
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Serial.write("p-Thermocouple: not detecting heating, positioning or relay fault\n");
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unrecoverableErr = 1;
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break;
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}
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if (millis() - startTime > 90000 && pumpStatus == 0) { // break out of the loop after 60s if the boiler is not yet hot
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delay(100);
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Serial.write("h-taking too long, continuing...\n");
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break;
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}
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// actual heater logic follows:
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// check aprox. derivative every second and shut off heater if temperature is increasing too quickly!
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// conversely, heater is turned on if temperature is not incresing quickly enough
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if (millis() > (pMillis + 1000)){
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// initially run the heater on fully. eg: if we set the number to 30 and start with
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// Tambient = 20C and desiredTemp = 90 the heater will stay fully on until 90-30 = 60C
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//if (Tc < (desiredTemp - 30)) { // old if with variable temp
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// new if with hard-coded minimum pulsing enable temperature of 70C
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if (Tc < 70 || Tc < (desiredTemp - 20)) {
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digitalWrite(boilerPin, HIGH);
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}
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// change this value for proportional behaviour: lower values will cycle the relay more often.
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// Cycling often reduces temperature undershoot, but will shorten contact lifespan
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else if ((Tc - Tp) < 0.6) {
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digitalWrite(boilerPin, HIGH);
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}
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//else if ((Tc - Tp) > 1) {
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// digitalWrite(boilerPin, LOW);
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//}
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else {
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digitalWrite(boilerPin, LOW);
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// delay(1000); // extra 1s delay to keep boiler off for 2s total (delay + millis())
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}
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// this next if lets us call us for pumping while still monitoring heat
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if (pumpStatus == 1 && ((millis() - startTime)/1000) < pumpRatio) {
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digitalWrite(pumpPin, HIGH);
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}
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else if (pumpStatus == 1 && ((millis() - startTime)/1000) > pumpRatio) {
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digitalWrite(pumpPin, LOW);
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break;
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}
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else {
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//digitalWrite(pumpPin, LOW);
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//pumpStatus = 0;
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}
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Tp = Tc;
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pMillis = millis();
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}
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delay(milliseconds);
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}
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digitalWrite(boilerPin, LOW);
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digitalWrite(redLED, LOW);
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digitalWrite(greenLED, HIGH);
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}
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//_____________________________________________________________________________
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void Press() {
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digitalWrite(greenLED, LOW);
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delay(100);
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Serial.write("pressing...\n");
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// Reset Press before every coffee
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digitalWrite(invertWheelPin, HIGH);
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delay(100);
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digitalWrite(invertWheelPin, LOW);
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digitalWrite(wheelPin, HIGH);
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startTime = millis();
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while (true) {
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delay(milliseconds);
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if (digitalRead(wheelEndSensorPin) == HIGH) {
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delay(90); // extra delay added to compensate for slightly incorrect endstop placement after repair
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digitalWrite(wheelPin, LOW);
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delay(100);
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Serial.write("Pressed\n");
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break;
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}
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if (millis() - startTime > 15000) {
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delay(100);
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Serial.write("p-end of pressing not detected\n");
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digitalWrite(wheelPin, LOW);
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unrecoverableErr = 1; //temporarily disabled because of failing sensor(s)
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break;
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}
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}
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digitalWrite(greenLED, HIGH);
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}
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//_____________________________________________________________________________
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void unPress() {
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digitalWrite(greenLED, LOW);
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delay(100);
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Serial.write("unPressing...\n");
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// Reset Press before every coffee
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digitalWrite(wheelPin, HIGH);
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delay(150);
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digitalWrite(wheelPin, LOW);
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digitalWrite(invertWheelPin, HIGH);
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startTime = millis();
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while (true) {
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delay(milliseconds);
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if (digitalRead(wheelStartSensorPin) == HIGH) {
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delay(1000);
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digitalWrite(invertWheelPin, LOW);
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delay(100);
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Serial.write("UnPressed\n");
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break;
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}
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if (millis() - startTime > 15000) {
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delay(100);
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Serial.write("u-end of unPressing not detected\n");
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digitalWrite(invertWheelPin, LOW);
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//unrecoverableErr = 1; //temporarily disabled because of failing sensor(s)
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break;
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}
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}
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digitalWrite(greenLED, HIGH);
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}
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//_____________________________________________________________________________
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void Pump() {
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digitalWrite(greenLED, LOW);
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delay(100);
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Serial.write("pumping Water...\n");
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pumpStatus = 1; // set pumpStatus variable to 1 to tell Heat() function to pump
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Heat(); // call Heat function with current parameters
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pumpStatus = 0; // set pumpStatus variable to 0
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//digitalWrite(pumpPin, HIGH);
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//while (pumpRatio > 1) {
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// pumpRatio--;
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// delay(1000);
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//}
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//digitalWrite(pumpPin, LOW);
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delay(100);
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Serial.write("Pumping water done\n");
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digitalWrite(greenLED, HIGH);
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}
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//_____________________________________________________________________________
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void makeCoffee() {
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// code to make coffee goes here...
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// It would be much smarter to break down complicated functions into subroutines: press/unpress etc...
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// Hence that's what we'll have done by the time the first release goes public ;)
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// makeCoffee() can still run all the same, but clean() can use the same press/unpress code!
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// care must be taken to place these functions earlier in the code, or the compiler will rightfully freak out
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while (true) {
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desiredTemp = 80;
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Heat(); // First we pre-heat the boiler
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if (unrecoverableErr == 1) {
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break;
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}
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if (dry == 0 && noCoffee == 0) {
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Grind(); // Grinding some nice roasted coffee beans!
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}
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// If grinder won't stop, coffee probably needs to be refilled.
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if (warning == 1) {
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delay(100);
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Serial.write("refill coffee and send cont command\n");
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while (true) {
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// check if data has been sent on serial from ESP or PC:
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if (Serial.available() > 0) {
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// read the incoming data: (we only care about the first few characters, I've chosen 4)
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readString = "";
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serialRead();
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String incomingData = readString.substring(0,4);
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if (incomingData == "cont") {
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// coffee refilled, making is allowed to continue
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Serial.write("Refilled\n");
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warning = 0;
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Grind(); // Grinding some nice roasted coffee beans!
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if (warning == 1) {
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unrecoverableErr = 1;
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Serial.write("g-failure: second grinding failure, check grinder!\n");
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}
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break;
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}
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}
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}
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}
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// Stop if grinding failed a second time
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if (unrecoverableErr == 1) {
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break;
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}
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delay(1000); // this delay is mandatory to prevent powder spillage caused by grinder inertia.
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unPress(); // unpressing the press to reset the machine
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if (unrecoverableErr == 1) {
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break;
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}
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Drop(); // Dropping the powder in the press
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delay(1000);
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Press(); // Self explainatory
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if (unrecoverableErr == 1) {
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break;
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}
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desiredTemp = 90;
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Heat(); // First we pre-heat the boiler
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if (unrecoverableErr == 1) {
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break;
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}
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if (dry == 0) {
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//digitalWrite(boilerPin, HIGH);
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delay(100);
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desiredTemp = 95; // temperature to try and maintain while making coffee
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Pump(); // Pump ratio (in seconds) will be read from serial input in final release
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digitalWrite(boilerPin, LOW);
|
|
}
|
|
delay(3000); // Allow pressure to wane
|
|
|
|
unPress(); // unpressing the press to reset the machine
|
|
if (unrecoverableErr == 1) {
|
|
break;
|
|
}
|
|
delay(100);
|
|
Serial.write("Complete!\n");
|
|
delay(1000);
|
|
dry = 0;
|
|
noCoffee = 0;
|
|
if (warned == 1) {
|
|
resetFunc(); //call reset. I am ashamed of this, but it works.
|
|
}
|
|
break;
|
|
}
|
|
}
|