#include <Adafruit_MCP23X17.h>

const int pushButton[] = {2, 3, 4, 5, 6, 7}; // define push button inputs
const int relayPin[] = {13, 12, 11, 10, 9, 8}; // output pins where 4 relays will be connected
String relayNames[] = {"CH1", "CH2", "CH3", "CH4", "CH5", "CH6", "CH7"}; // Just put name for 4 relays
int pushed[] = {0, 0, 0, 0, 0, 0}; // status of each buttons
int relayStatus[] = {HIGH, HIGH, HIGH, HIGH, HIGH, HIGH}; // initial status of relay
String id;

void setup() {
  // Robojax.com 4-Relay-4-Push button 20181211
  Serial.begin(9600);// initialize serial monitor
  for (int i = 0; i < 6; i++)
  {
    pinMode(pushButton[i], INPUT_PULLUP);
    pinMode(relayPin[i], OUTPUT);
    digitalWrite(relayPin[i], LOW);// initial relay status to be OFF
  }

  // Robojax.com 4-Relay-4-Push button 20181211
}

void loop() {
  // Robojax.com 4-Relay-4-Push button 20181211

  for (int i = 0; i < 6; i++)
  {
    int  val = digitalRead(pushButton[i]);
    delay(1);

    if (val == LOW && relayStatus[i] == HIGH) {
      Serial.println("aaaaaaaaaaaaaaaaa");
      pushed[i] = 1 - pushed[i];
      delay(1);

      if (pushed[i] == HIGH) {
        id = relayNames[i] + "ON";
        Serial.print(relayNames[i]);
        Serial.println(" ON");
        digitalWrite(relayPin[i], HIGH);

      } else {
        Serial.print(relayNames[i]);
        Serial.println(" OFF");
        digitalWrite(relayPin[i], LOW);
        id = relayNames[i] + "OFF";
      }// else



    }// if


    relayStatus[i] = val;
    if (id == "CH1ON") {
      Serial.println("1_on");
    } else if (id == "CH1OFF") {
      Serial.println("1_off");
    }


  }// for
  // Serial.println("==");
  //delay(1);
  // Robojax.com 4-Relay-4-Push button 20181211
}// loop end