New repository for old PyCoffee Machine.
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// Pinout configuration
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;
// Global string
String readString;
// Thermistor config
// WARNING! while the old coffee machine used a PTC thermistor, this was replaced with an NTC one as it was more readily available
// Code must be adjusted accordingly if a PTC resistor is used once more!
int Vo;
float R1 = 10000; // <-- change this value to the resistance of the fixed resistor (so don't change PLS!)
float logR2, R2, T, Tc, Told;
float c1 = 7.9e-04, c2 = 1.85e-04, c3 = 2e-07; // Here's where you can perform actual calibration
// Variable to store desired Max boiler Temp
int desiredTemp = 70;
// Variables to Store errors:
int unrecoverableErr = 0;
int warning = 0;
// Variables for cleaning and other maintenance
int dry = 0;
int noCoffee = 0;
// Milliseconds to delay between each cycle
const int milliseconds = 10;
int timeratio = 1;
// pumpRatio is = seconds to pump water for and will be updated over serial
int pumpRatio = 15;
// This next variable is used to get current "time" in ms and break out of while cycles that need a time limit safeguard
unsigned long startTime;
void setup() {
// put your setup code here, to run once:
// first we set pins as I/O and initialize outputs LOW
pinMode(boilerPin, OUTPUT); pinMode(pumpPin, OUTPUT); pinMode(grinderPin, OUTPUT); pinMode(powderPin, OUTPUT); pinMode(wheelPin, OUTPUT); pinMode(invertWheelPin, OUTPUT); pinMode (redLED, OUTPUT); pinMode (greenLED, OUTPUT);
pinMode(powderSensorPin, INPUT); pinMode(vaporSensorPin, INPUT); pinMode(tempSensorPin, INPUT); pinMode(wheelStartSensorPin, INPUT); pinMode(wheelEndSensorPin, INPUT);
digitalWrite(grinderPin, LOW); digitalWrite(pumpPin, LOW); digitalWrite(boilerPin, LOW); digitalWrite(powderPin, LOW); digitalWrite(wheelPin, LOW); digitalWrite(invertWheelPin, LOW); digitalWrite(redLED, LOW); digitalWrite(greenLED, LOW);
// timeratio easily allows to determine how many cycles are required to make 1s pass (ms * ratio = 1s)
timeratio = 1000/milliseconds;
// initialize serial:
Serial.begin(9600);
delay(100);
Serial.write("Arduino running :)\n");
}
void loop() {
// put your main code here, to run repeatedly:
// Check if unrecoverable error has occurred:
if (unrecoverableErr == 1) {
delay(100);
Serial.write("Error has occurred.\n"); delay(100); Serial.write("Check machine and restart\n");
digitalWrite(greenLED, LOW);
while (true){
digitalWrite(redLED, HIGH);
delay(1000);
digitalWrite(redLED, LOW);
delay(1000);
}
}
// check if data has been sent on serial from ESP or PC:
if (Serial.available() > 0) {
// read the incoming data: (we only care about the first few characters, I've chosen 4)
readString = "";
serialRead();
String incomingData = readString.substring(0,4);
if (incomingData == "read") {
digitalWrite(greenLED, HIGH);
}
if (incomingData == "rist") {
// set parameters for ristretto:
delay(100);
Serial.write("Ristretto\n");
pumpRatio = 12;
}
if (incomingData == "espr") {
// set parameters for espresso:
delay(100);
Serial.write("Espresso\n");
pumpRatio = 15;
}
if (incomingData == "long") {
// set parameters for lungo:
delay(100);
Serial.write("Lungo\n");
pumpRatio = 18;
}
// check if the incoming data is "make":
if (incomingData == "make") {
// run the code to make coffee:
delay(100);
Serial.write("Making some coffee!\n");
makeCoffee();
}
if (incomingData == "dryr") {
// run the code to make a dry run (no powder, no water):
delay(100);
Serial.write("DryRun\n");
dry = 1;
makeCoffee();
}
if (incomingData == "noco") {
// run the code to make a dry run (no powder, nor water):
delay(100);
Serial.write("NoCo\n");
pumpRatio = 12;
noCoffee = 1;
makeCoffee();
}
if (incomingData == "pump") {
// run the code to just pump water:
pumpRatio = 12;
Pump();
}
if (incomingData == "pres") {
// only press
Press();
}
if (incomingData == "unpr") {
// only unpress
unPress();
}
if (incomingData == "heat") {
// only heat
desiredTemp = 85;
Heat();
}
if (incomingData == "clea") {
// clean machine
delay(100);
Serial.write("s-clean\n");
dry = 1;
makeCoffee();
noCoffee = 1;
makeCoffee();
delay(100);
Serial.write("S-cleaning done.\n");
}
}
delay(milliseconds);
}
// this is how we read the input
void serialRead() {
while (Serial.available()) {
delay(10);
if (Serial.available() > 0) {
char c = Serial.read();
readString += c;}
}
}
void Grind() {
digitalWrite(greenLED, LOW);
delay(100);
Serial.write("grinding...\n");
digitalWrite(grinderPin, HIGH);
startTime = millis();
while (true) {
delay(milliseconds);
if (digitalRead(powderSensorPin) == HIGH) {
digitalWrite(grinderPin, LOW);
delay(100);
Serial.write("Grinding Done\n");
break;
}
if (millis() - startTime > 30000) {
delay(100);
Serial.write("Warning, grinding took too long!\n");
delay(100);
Serial.write("Out of Coffee?\n");
warning = 1;
break;
}
}
digitalWrite(greenLED, HIGH);
}
void Drop() {
digitalWrite(greenLED, LOW);
delay(100);
Serial.write("dropping...\n");
digitalWrite(powderPin, HIGH);
delay(1000);
digitalWrite(powderPin, LOW);
delay(100);
Serial.write("Dropped\n");
digitalWrite(greenLED, HIGH);
}
void Heat() {
digitalWrite(greenLED, LOW);
digitalWrite(redLED, HIGH);
startTime = millis();
delay(100);
Serial.write("Heating to ");
delay(100);
Serial.print(desiredTemp);
delay(100);
Serial.write(" C\n");
Tc = 0;
Told = -100;
// monitor temperature and adjust boilerPin as needed:
while (true) {
// read temperature from tempSensorPin:
Vo = analogRead(tempSensorPin);
R2 = R1 * (1023.0 / (float)Vo - 1.0);
logR2 = log(R2);
T = (1.0 / (c1 + c2*logR2 + c3*logR2*logR2*logR2));
Tc = (T - 273.15);
if (millis() - startTime > 1000) {
Told = Tc; // support variable to store temp at beginning, so that we can be sure it's increasing
}
// check if temperature is within the acceptable range and break out of the loop without error if done heating:
if (Tc > desiredTemp) {
// temperature is within range, so break out of the loop:
digitalWrite(boilerPin, LOW);
delay(100);
Serial.write("reached desired temp\n");
delay(100);
Serial.print(Tc);
delay(100);
Serial.write(" C\n");
digitalWrite(redLED, LOW);
break;
}
if (Tc < -100) {
delay(100);
Serial.write("u-Thermocouple: unplugged or failed\n");
digitalWrite(boilerPin, LOW);
unrecoverableErr = 1;
break;
}
if (millis() - startTime > 20000 && Tc - Told < 5) {
delay(100);
Serial.write("p-Thermocouple: positioning or relay fault\n");
digitalWrite(boilerPin, LOW);
unrecoverableErr = 1;
break;
}
if (millis() - startTime > 30000) {
delay(100);
Serial.write("h-taking too long, continuing...\n");
digitalWrite(boilerPin, LOW);
digitalWrite(redLED, LOW);
break;
}
// We do this at the end so that the relay is not uselessly cycled
digitalWrite(boilerPin, HIGH);
delay(milliseconds);
}
digitalWrite(greenLED, HIGH);
}
void Press() {
digitalWrite(greenLED, LOW);
delay(100);
Serial.write("pressing...\n");
// Reset Press before every coffee
digitalWrite(invertWheelPin, HIGH);
delay(1000);
digitalWrite(invertWheelPin, LOW);
digitalWrite(wheelPin, HIGH);
startTime = millis();
while (true) {
delay(milliseconds);
if (digitalRead(wheelEndSensorPin) == HIGH) {
digitalWrite(wheelPin, LOW);
delay(100);
Serial.write("Pressed\n");
break;
}
if (millis() - startTime > 15000) {
delay(100);
Serial.write("p-end of pressing not detected\n");
digitalWrite(wheelPin, LOW);
unrecoverableErr = 1;
break;
}
}
digitalWrite(greenLED, HIGH);
}
void unPress() {
digitalWrite(greenLED, LOW);
delay(100);
Serial.write("unPressing...\n");
// Reset Press before every coffee
digitalWrite(wheelPin, HIGH);
delay(1000);
digitalWrite(wheelPin, LOW);
digitalWrite(invertWheelPin, HIGH);
startTime = millis();
while (true) {
delay(milliseconds);
if (digitalRead(wheelStartSensorPin) == HIGH) {
delay(1500);
digitalWrite(invertWheelPin, LOW);
delay(100);
Serial.write("UnPressed\n");
break;
}
if (millis() - startTime > 15000) {
delay(100);
Serial.write("u-end of unPressing not detected\n");
digitalWrite(invertWheelPin, LOW);
unrecoverableErr = 1;
break;
}
}
digitalWrite(greenLED, HIGH);
}
void Pump() {
digitalWrite(greenLED, LOW);
delay(100);
Serial.write("pumping Water...\n");
digitalWrite(pumpPin, HIGH);
delay(1000*pumpRatio);
digitalWrite(pumpPin, LOW);
delay(100);
Serial.write("Pumping water done\n");
digitalWrite(greenLED, HIGH);
}
void makeCoffee() {
// code to make coffee goes here...
// It would be much smarter to break down complicated functions into subroutines: press/unpress etc...
// Hence that's what we'll have done by the time the first release goes public ;)
// makeCoffee() can still run all the same, but clean() can use the same press/unpress code!
// care must be taken to place these functions earlier in the code, or the compiler will rightfully freak out
while (true) {
desiredTemp = 75;
Heat(); // First we pre-heat the boiler
if (unrecoverableErr == 1) {
break;
}
if (dry == 0 && noCoffee == 0) {
Grind(); // Grinding some nice roasted coffee beans!
}
// If grinder won't stop, coffee probably need to be refilled.
if (warning == 1) {
delay(100);
Serial.write("refill coffee and send cont command\n");
while (true) {
// check if data has been sent on serial from ESP or PC:
if (Serial.available() > 0) {
// read the incoming data: (we only care about the first few characters, I've chosen 4)
readString = "";
serialRead();
String incomingData = readString.substring(0,4);
if (incomingData == "cont") {
// coffee refilled, making is allowed to continue
Serial.write("Refilled\n");
warning = 0;
Grind(); // Grinding some nice roasted coffee beans!
if (warning == 1) {
unrecoverableErr = 1;
Serial.write("g-failure: second grinding failure, check grinder!\n");
}
break;
}
}
}
}
// Stop if grinding failed a second time
if (unrecoverableErr == 1) {
break;
}
delay(1000); // this delay is mandatory to prevent powder spillage caused by grinder inertia.
unPress(); // unpressing the press to reset the machine
if (unrecoverableErr == 1) {
break;
}
Drop(); // Dropping the powder in the press
delay(1000);
Press(); // Self explainatory
if (unrecoverableErr == 1) {
break;
}
if (dry == 0) {
digitalWrite(boilerPin, HIGH);
delay(1000);
Pump(); // Pump ratio (in seconds) will be read from serial input in final release
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");
dry = 0;
noCoffee = 0;
break;
}
}