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85 lines
2.4 KiB
85 lines
2.4 KiB
#define relayPin 1 // enable/disable relay powering the siren
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#define switchPin 2 // tampering switch sensor
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#define buttonPin 3 // button to be held down to enable/disable alarm
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#define ledPin 4 // status LED to show when alarm is enabled
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#define ringTime 20 // time to ring the siren for (in seconds)
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int enableStatus = 1; // variable to store alarm status (1 = enabled); enabled at boot
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int countDown = 2; // times to repeat siren blip sound in sound() function
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void setup() {
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// here we assign pins as in/out and pull-up the inputs
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pinMode(relayPin, OUTPUT);
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digitalWrite(relayPin, LOW);
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pinMode(switchPin, INPUT_PULLUP);
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digitalWrite(switchPin, HIGH);
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pinMode(buttonPin, INPUT_PULLUP);
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digitalWrite(buttonPin, HIGH);
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pinMode(ledPin, OUTPUT);
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digitalWrite(ledPin, LOW);
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sound(); // give audible feedback at boot
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delay(10000); // wait 10s, then exit setup
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}
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void loop() {
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LED();
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ButtonCtrl();
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//Main alarm logic follows
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if (enableStatus == 1 && (digitalRead(switchPin) == LOW)){
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delay(500); //switch debounce
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if (digitalRead(switchPin) == LOW){
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digitalWrite(relayPin, HIGH); //sound the siren!
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delay(ringTime*1000); //let the siren sound for the duration of defined ringTime
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digitalWrite(relayPin, LOW); //now switch off the siren
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digitalWrite(ledPin, LOW); //switch off status LED
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enableStatus = 0; //disable the alarm after sounding
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}
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}
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}
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void sound() {
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// sound alert function used at boot and alarm enabling
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if (enableStatus == 1) {
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while (countDown > 0) {
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digitalWrite(relayPin, HIGH); //sound the siren!
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delay(5);
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digitalWrite(relayPin, LOW); //stop the siren
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delay(500);
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countDown--;
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}
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}
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}
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void LED() {
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// status LED control logic
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if (enableStatus == 1) {
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digitalWrite(ledPin, HIGH); //turn on status LED
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}
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else {
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digitalWrite(ledPin, LOW); //turn off status LED
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}
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}
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void ButtonCtrl() {
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// check if button is pressed, switch state accordingly
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if ((digitalRead(buttonPin) == LOW) && enableStatus != 1){
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delay(500); //button debounce
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if (digitalRead(buttonPin) == LOW){
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enableStatus = 1;
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countDown = 2;
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sound();
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}
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}
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else if ((digitalRead(buttonPin) == LOW) && enableStatus != 0){
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delay(500); //button debounce
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if (digitalRead(buttonPin) == LOW){
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countDown = 1;
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sound();
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enableStatus = 0;
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}
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}
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}
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