// Programmable Timer Relays


const int PWR_LED = 43;
int LED_TinH_ON = 18;
int LED_T_ON = 5000;
int LED_T_OFF = 5000;


class Relay {
  int relayPin;
  long OnTime;     // milliseconds of on-time
  long OffTime;    // milliseconds of off-time
  
  // These maintain the current state
  int relayState;                 // pumpState used to set the PUMP
  unsigned long previousMillis;   // will store last time PUMP was updated

  // Constructor - creates a Timer and initializes the member variables and state
  public:
  Relay(int pin, long on, long off)
  {
    relayPin = pin;
    pinMode(relayPin, OUTPUT);     
    
    OnTime = on;
    OffTime = off;
  
    relayState = LOW; 
    previousMillis = 0;  //ORIGINALLY 0
  }

  void Update()
  {
    // check to see if it's time to change the state of the TIMER
    unsigned long currentMillis = millis();
     
    if((relayState == HIGH) && (currentMillis - previousMillis >= OnTime))
    {
      relayState = LOW;  // Turn it off
      previousMillis = currentMillis;  // Remember the time
      digitalWrite(relayPin, relayState);  // Update the actual LED
    }
    else if ((relayState == LOW) && (currentMillis - previousMillis >= OffTime))
    {
      relayState = HIGH;  // turn it on
      previousMillis = currentMillis;   // Remember the time
      digitalWrite(relayPin, relayState);   // Update the actual RELAY
    }
  }
};

Relay relay3(PWR_LED, LED_T_OFF, LED_T_ON);
 

void setup() {
  Serial.begin(9600);
  
  pinMode(PWR_LED, OUTPUT);
}

void loop() {
  delay(1000);

  relay3.Update();
}

//slave

#include <Wire.h>

#define SLAVE_ADDRESS 0x08


const int PWR_LED = 43;
int LED_TinH_ON = 18;
int LED_T_ON = 5000;
int LED_T_OFF = 5000; 


String inString = "";    // string to hold input
byte LastMasterCommand = 0;
int Mval;

char user_input;

class Relay {
  int relayPin;
  long OnTime;     // milliseconds of on-time
  long OffTime;    // milliseconds of off-time
  
  // These maintain the current state
  int relayState;                 // pumpState used to set the PUMP
  unsigned long previousMillis;   // will store last time PUMP was updated

  // Constructor - creates a Timer and initializes the member variables and state
  public:
  Relay(int pin, long on, long off)
  {
    relayPin = pin;
    pinMode(relayPin, OUTPUT);     
    
    OnTime = on;
    OffTime = off;
  
    relayState = LOW; 
    previousMillis = 0;  //ORIGINALLY 0
  }

  void Update()
  {
    // check to see if it's time to change the state of the TIMER
    unsigned long currentMillis = millis();
     
    if((relayState == HIGH) && (currentMillis - previousMillis >= OnTime))
    {
      relayState = LOW;  // Turn it off
      previousMillis = currentMillis;  // Remember the time
      digitalWrite(relayPin, relayState);  // Update the actual LED
    }
    else if ((relayState == LOW) && (currentMillis - previousMillis >= OffTime))
    {
      relayState = HIGH;  // turn it on
      previousMillis = currentMillis;   // Remember the time
      digitalWrite(relayPin, relayState);   // Update the actual RELAY
    }
  }
};

Relay relay3(PWR_LED, LED_T_OFF, LED_T_ON);

void setup() {
 // initialize serial communication with computer:
  Serial.begin(9600); 

  Wire.begin(SLAVE_ADDRESS);

  Wire.onReceive(receiveData);
  Wire.onRequest(slavesRespond);

  pinMode(PWR_LED, OUTPUT);
} 


void loop() {
  delay(1000);

  Serial.print("LED_T_ON=");
  Serial.println(LED_T_ON);
  Serial.print("LED_T_OFF=");
  Serial.println(LED_T_OFF);
  Serial.println();

  relay3.Update();

  switch (Mval) {
    case 1 ... 25:
      LED_TinH_ON = Mval;
      Serial.print("LED time on: ");
      Serial.print(LED_TinH_ON);
      Serial.println("h");
      LED_T_ON = LED_TinH_ON*1000;//*60*60;
      LED_T_OFF = (24-LED_TinH_ON)*1000;//*60*60;
    break;
  }
}


void receiveData(int byteCount) {
  LastMasterCommand = Wire.read();
  while (Wire.available()) {
    int msg = Wire.read();

    if (isDigit(msg)) {
      inString += (char)msg;
    }
  }
  Mval = inString.toInt();
  //Serial.println(LastMasterCommand);
  inString = "";
  //Serial.println(Mval);
}

void slavesRespond() {
}