Arduino Homework

One of the homework tasks was to create a condition that required an analogue input to be within a certain range. I went with the example given, having a light respond to a temperature sensor.

The starting point was the 'Temperature Alarm' instructions that came with the Arduino kit.
After I got this to work I added two LEDs to the system and gave them instructions on what to do with different temperature thresholds.

Here is the code...

// Conditional Thermostat Test with Temperature Alarm
float sinVal;
int toneVal;
unsigned long tepTimer;
int greenLED = 9;
int redLED = 10;

void setup() {
  pinMode (8, OUTPUT); //configure buzzer pin
  pinMode(greenLED, OUTPUT);
  pinMode(redLED, OUTPUT);
  Serial.begin(9600); // configure baud rate to 9600 bps
}

void loop() {
  int val; //save the value of LM35 temperature sensor
  double data; //save the converted value of temperature
  val = analogRead(0); //Connect LM35 to analogue pin and read value from it
  data = (double) val * (5 / 10.24); //converts the voltage value to temperature value


   if (millis() - tepTimer > 50) //Every 500 ms, serial port oputputs temperature value
        tepTimer = millis();
      Serial.print("temperature: "); // Serial port outputs temperature
      Serial.print(data); //Serial port outpouts temperature value
      Serial.println("C"); // Serial port output temperature unit

  if (data < 23) { // if temperature is less than the threshold, the greenLED lights up
    digitalWrite(greenLED, HIGH); // turns on the greenLED
  }
  else { // If the temperature is lower than the threshold, turn off the greenLED
    digitalWrite(greenLED, LOW); // turns off the green LED

    {
      if (data > 23) { // if temperature is higher than the threshold, the buzzer starts to make sound
        for (int x = 0; x < 180; x++) { //Convert sin function to radian
          sinVal = (sin(x * (3.1412 / 180))); //Use sin function to generate frequency of sound
          toneVal = 2000 + (int(sinVal * 1000)); // configure the buzzer pin 8
          tone(8, toneVal);
          delay(2);
          digitalWrite(redLED, HIGH); // and the red LED lights up
        }
      }else { // If the temperature is lower than the threshold, turn off the buzzer and the redLED
        noTone(8); // turn off the buzzer
        digitalWrite(redLED, LOW); // turns off the red LED
      }

   
   
    }
  }
}