/*
  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 10 Sept 2023
  by Jon Vargo

  This example code is in the public domain.

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

// 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
const int analogOutPin = 9;  // Analog output pin that the LED is attached to
const int digitalOutPin = 6;  // Analog output pin that relays are attached to

int sensorValue = 0;  // value read from the pot
int outputValue = 0;  // value output to the PWM (analog out)

 //*****************************************************************************
  // Relays turn on when the potentiometer is past midpoint
  int relays = 6;
  int oldRelays, oldOutputValue, OldSensorValue;

void setup() {
  // initialize serial communications at 9600 bps:
  Serial.begin(9600);
 //************************************************************************
  // Relays
  //************************************************************************
  pinMode(relays, OUTPUT);
}

void loop() {
  // read the analog in value:
  sensorValue = analogRead(analogInPin);
  // map it to the range of the analog out:
  outputValue = map(sensorValue, 0, 1023, 0, 255);
  // change the analog out value:
  analogWrite(analogOutPin, outputValue);

  // print the results to the Serial Monitor:
  Serial.print("sensor = ");
  Serial.print(sensorValue);
  Serial.print("\t output = ");
  Serial.println(outputValue);

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

    //*******************************************************************************
   // relays ON if sensor < 300, relays OFF if >=400, <=600, relays ON if sensor > 700, 
  //*******************************************************************************
    if (sensorValue > 525) {
    digitalWrite(relays, HIGH);
  } if (sensorValue < 475) {
    digitalWrite(relays, HIGH);
  } else if (sensorValue >= 475 && sensorValue <= 525) {
    digitalWrite(relays, LOW);}
}