/*
  Analog Input to LED

  Demonstrates analog input by reading an analog sensor (PHOTOTRANSISTOR) on analog pin 0 and
  turning on and off a light emitting diode(LED) connected to digital pin 7.
  The amount of time the LED will be on and off depends on the value obtained
  by analogRead().
  This code is optimised for usage with the ATTiny44A

  created by David Cuartielles
  modified 30 Aug 2011
  By Tom Igoe
  modified 12 Mar 2019
  by Joey van der Bie

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/AnalogInput
*/

const int PHOTOTRANSISTOR_PIN = A2;    // select the input pin for the PHOTOTRANSISTOR
const int LED_PIN = 7;     // select the pin for the LED
int sensorValue = 0;  // variable to store the value coming from the sensor

void setup() {
  // declare the LED pin as an OUTPUT:
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  // read the value from the sensor:
  sensorValue = analogRead(PHOTOTRANSISTOR_PIN);
  // turn the ledPin on
  digitalWrite(LED_PIN, HIGH);
  // stop the program for <sensorValue> milliseconds:
  delay(sensorValue);
  // turn the ledPin off:
  digitalWrite(LED_PIN, LOW);
  // stop the program for for <sensorValue> milliseconds:
  delay(sensorValue);
}