Task1.3C

// In order to convert an analog input to an LOW/HIGH value and utilise
// interrupts I have set an additional Arduino board to perform the conversion.
// The second Arduino board simply takes the value from the photoresistor and
// changes it to a HIGH state value if over 100 and LOW state if under


// Set labels for pins
const uint8_t SEN_PIN1 = 2;
const uint8_t SEN_PIN2 = 3;
const uint8_t LED_PIN1 = 12;
const uint8_t LED_PIN2 = 13;

// Set variable to record input state
volatile uint8_t sensor1State = LOW;
volatile uint8_t sensor2State = LOW;

void setup()
{
  // Set pins as input or output
  pinMode(SEN_PIN1, INPUT);
  pinMode(SEN_PIN2, INPUT);
  pinMode(LED_PIN1, OUTPUT);
  pinMode(LED_PIN2, OUTPUT);
  // Set an interrupt to occur when a change is detected
  attachInterrupt(digitalPinToInterrupt(SEN_PIN1), pin1_ISR, CHANGE);
  attachInterrupt(digitalPinToInterrupt(SEN_PIN2), pin2_ISR, CHANGE);
  // Begin recording serial
  Serial.begin(9600);
}

void loop()
{
  // Display variable in serial monitor
  Serial.print("Sensor 1 state: ");
  Serial.println(sensor1State);
  Serial.print("Sensor 2 state: ");
  Serial.println(sensor2State);
  Serial.println();
  delay(10);
}

void pin1_ISR()
{
  // Set input value to variable
  sensor1State = digitalRead(SEN_PIN1);
  // Change LED based on state
  digitalWrite(LED_PIN2, sensor1State);
}
void pin2_ISR()
{
  // Set input value to variable
  sensor2State = digitalRead(SEN_PIN2);
  // Change LED based on state
  digitalWrite(LED_PIN1, sensor2State);
}