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Outcome

Goal: The light change from red to blue as temperature go low, indicating the water is drinkable.

The prototype show that when temperature goes up the light goes red.


const int RED_LED_PIN = A2;
const int GREEN_LED_PIN = A1;
const int BLUE_LED_PIN = A0;
int temperaturePin = A5;
int inputPin = D1;
int val = 0;
int state = 1;
int tempHigh = 28;
int tempLow = 24;

int greenIntensity = 0;
int blueIntensity = 0;


void setup() {


    pinMode(RED_LED_PIN, OUTPUT);
    pinMode(GREEN_LED_PIN, OUTPUT);
    pinMode(BLUE_LED_PIN, OUTPUT);

    pinMode(temperaturePin, INPUT);
    pinMode(inputPin, INPUT);

    Serial.begin(9600);
}

void loop() {
    val = digitalRead(inputPin);
    double temperature = (analogRead(temperaturePin) * 3.3) / 4095;
    temperature = (temperature - 0.5) * 100;
    Serial.println(temperature);
    int adjRed = (int) (255 - redVal(temperature));
    int adjBlue = (int) (255 - blueVal(temperature));
    if (val == LOW) {
        state = !state;
        delay(250);

    }

    if (!state) {
        adjRed = 255;
        adjBlue = 255;
    }


    analogWrite(GREEN_LED_PIN, 255);

    analogWrite(BLUE_LED_PIN, adjBlue);
    analogWrite(RED_LED_PIN, adjRed);

    Serial.println("red: " + String(adjRed));
    Serial.println("blue: " + String(adjBlue));
    Serial.println(state);

}



double redVal(double temp){
    if (temp >= tempHigh){
        return 255;
    } else if (temp <= tempLow){
        return 0;
    }
    double mulFactor = (256/(tempHigh - tempLow));
    double retVal = mulFactor*(temp - tempLow);
    if (retVal > 0){
        retVal = retVal - 1;
    }

    return retVal;
}

double blueVal(double temp){

    double retVal = redVal(temp); 
    retVal = 255 - retVal;
    return retVal;
}

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