/* 24/09/2021
   catWasherV4
   
   Arduino Nano, pir sensor, temp sensor, relay module
   
   Senses movement and closes relay that starts water pump
   temp sensor to prevent pump running if frozen

   pins used
   A2 tempPin
   8  pir sensor
   9  pump relay
   13 led

*/
const  int tempPin = A2;//analog pin

const int pirPin = 8;     //movement sensor
const int relayPin = 9;   //Pump Relay
const int ledPin = 13;    //Built in LED

unsigned long squirtTimer;
int squirtState; //0 = off 1= someones getting wet

unsigned long tempTimer;
float tempCelc;

void setup() {
  Serial.begin(9600);
  Serial.println("catWasherV4");
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(relayPin, OUTPUT);

}

void loop() {
  int tempReading;
  //check the temperature
  if (millis() > tempTimer) {
    //tempTimer = millis() + 1000;//1 sec for testing
    tempTimer = millis() + 600000;//10 minutes
    tempReading = analogRead(tempPin);
    tempCelc = (tempReading / 1024.0) * 500;
    Serial.println(tempCelc);

  }
  //if the temp is above 4.0C (allows time for frozen system to de ice) 
  if (tempCelc > 4.00) {//don't fire if temp lower than 4C...colder outside case
    //check if it's time to do something
    if (millis() > squirtTimer) { //either time to check pir or turn water off
      //Already squirting water so turn it off and wait 25 seconds
      if (squirtState > 0) {
        digitalWrite(relayPin, LOW); //water spraying so time to turn it off
        digitalWrite(ledPin, LOW);//led off
        squirtState = 0;
        squirtTimer = millis() + 25000;//stop everything for 25 secs
      } else {
        //Check the momement sensor for movement
        squirtState = digitalRead(pirPin);
        //Serial.println(squirtState);

        //If it spots movement...turn the relay/pump on
        if (squirtState > 0) {
          digitalWrite(relayPin, HIGH); //turn the pump on :-)
          digitalWrite(ledPin, HIGH);//led on
          //squirt for 5 seconds...cat will be up the road by now
          squirtTimer = millis() + 5000;//5 seconds is enough
        } else {
          //no movement check again in 0.3 seconds
          squirtTimer = millis() + 300; //check again in 0.3 seconds
        }
      }
    }
  }
}