turbidity_pwm_measure.ino

#include <TimerOne.h>

// This example uses the timer interrupt to blink an LED
// and also demonstrates how to share a variable between
// the interrupt and the main program.

const int led = 3;  // the pin with a LED
int ledState = LOW; 


// note: need to add amplification factor

void setup(void)
{
  pinMode(led, OUTPUT);
  Timer1.initialize(500);
  Timer1.attachInterrupt(blinkLED); // blinkLED to run every 0.15 seconds
  Serial.begin(9600);
}


// The interrupt will blink the LED, and keep
// track of how many times it has blinked.
volatile int flag = 0; //whether we're in the 'on' state

void blinkLED(void)
{
  if (ledState == LOW) {
    ledState = HIGH;
    flag = 1; 
    //blinkCount = blinkCount + 1;  // increase when LED turns on
  } else {
    ledState = LOW;
  }
  digitalWrite(led, ledState);
  
}


// The main program will print the blink count
// to the Arduino Serial Monitor
void loop(void)
{

 /*
  noInterrupts();
  flag = 0; // write to the flag without conflicting with ISR writes
  interrupts();
 */

      // read A0
      int val1 = analogRead(0);
      // read A1
     // int val2 = analogRead(1);

      int val2 = 0; // just have dummy variable for now
      // print to serial
      Serial.print(val1);
      Serial.print(" ");
      Serial.print(val2);
      Serial.print("\n");
      // wait 
      delay(50);
      

}