/*
  Analog input, analog output, serial output

  Reads an analog input pin, maps the result to a range from 0 to 255 and uses
  the result to set the pulse width modulation (PWM) of an output pin.
  Also prints the results to the Serial Monitor.

  The circuit:
  - potentiometer connected to analog pin 0.
    Center pin of the potentiometer goes to the analog pin.
    side pins of the potentiometer go to +5V and ground
  - LED connected from digital pin 9 to ground through 220 ohm resistor

  created 29 Dec. 2008
  modified 9 Apr 2012
  by Tom Igoe

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/AnalogInOutSerial
*/

/*
Name: Or Bacalu
Date: 20.5.24
*/

// These constants won't change. They're used to give names to the pins used:
const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to

int sensorValue = 0;        // value read from the pot
int mapValue = 0;        // delay value in ms
float delay_time = 0.0;

boolean ledState = false; 
unsigned long startTime;  // start time of the LED that turned ON
unsigned long delayTimeLED;  // delay time of the LED that need to be ON/OFF based on the light
unsigned long endTime=0;  // the time the LED turned OFF

void setup() {
  // initialize serial communications at 9600 bps:
  Serial.begin(9600);
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  // read the analog in value:
  sensorValue = analogRead(analogInPin);

  // map it to the range of the analog out:
  mapValue = map(sensorValue, 0, 1023, 4000, 250);
  delay_time = float(mapValue) / 1000.0;

  // print the results to the Serial Monitor:
  Serial.print("sensor = ");
  Serial.print(sensorValue);
  Serial.print("\t time lap [sec] = ");
  Serial.println(delay_time);

  // set the current time
  unsigned long currentTime = millis();
  // set the delay time of the LED based on the light
  delayTimeLED = mapValue;

  if(ledState == false && currentTime - endTime >= delayTimeLED){
    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
    ledState = true;
    startTime = currentTime;
  }

  if(ledState && currentTime - startTime >= delayTimeLED){
    digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
    ledState = false;
    endTime = currentTime;
  }

  // wait 2 milliseconds before the next loop for the analog-to-digital
  // converter to settle after the last reading:
  delay(2);
}