// For: https://forum.arduino.cc/t/two-buttons-to-control-two-different-set-of-leds/979984

int switchPin = 9;              // switch is connected to pin 9
int switchPin2 = 10;         // switch2 is connected to pin 10
int led1Pin = 2;
int led2Pin = 3;
int led3Pin = 4;
int led4Pin = 5;
int led5Pin = 6;

int val;                        // variable for reading the pin status
int val2;                       // variable for reading the delayed status
int val3;
int val4;
int buttonState;                // variable to hold the button state
int buttonState2;
int Mode = 0;              // What mode is the light in?

void setup() {
  pinMode(switchPin, INPUT);    // Set the switch pin as input
  pinMode(switchPin2, INPUT);    // Set the switch pin as input
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  pinMode(led3Pin, OUTPUT);
  pinMode(led4Pin, OUTPUT);
  pinMode(led5Pin, OUTPUT);
  buttonState = digitalRead(switchPin);   // read the initial state
  buttonState2 = digitalRead(switchPin2);   // read the initial state
}

void loop(){
  val = digitalRead(switchPin);      // read input value and store it in val
  delay(100);                         // 10 milliseconds is a good amount of time
  val2 = digitalRead(switchPin);     // read the input again to check for bounces
  if (val == val2) {                 // make sure we got 2 consistant readings!
    if (val != buttonState) {          // the button state has changed!
      if (val == LOW) {                // check if the button is pressed
        if (Mode == 0) {          
          Mode = 1;               
        } else {
            if (Mode == 1) {        
            Mode = 2;           
        } else {
            if (Mode == 2) {      
            Mode = 0;           
        } 
       }
      }
     }
    }
    buttonState = val;                 // save the new state in our variable
  }

  // Now do whatever the lightMode indicates
  if (Mode == 0) { // all-off
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, LOW);
  }

  if (Mode == 1) { 
    digitalWrite(led1Pin, HIGH);
    digitalWrite(led2Pin, LOW);
  }

  if (Mode == 2) { 
    digitalWrite(led1Pin, HIGH);
    digitalWrite(led2Pin, HIGH);
  }
  if (Mode == 3)  { 
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, LOW);
  }    
     
val3 = digitalRead(switchPin2);      // read input value and store it in val
  delay(100);                         // 10 milliseconds is a good amount of time
  val4 = digitalRead(switchPin2);     // read the input again to check for bounces
  if (val3 == val4) {                 // make sure we got 2 consistant readings!
    if (val3 != buttonState2) {          // the button state has changed!
      if (val3 == LOW) {                // check if the button is pressed
        if (Mode == 0) {          
          Mode = 1;               
        } else {
            if (Mode == 1) {        
          Mode = 2;           
        } else {
            if (Mode == 2) {      
            Mode = 3;
        } else {
            if (Mode == 3) {  
             Mode =0;        
              }
        } 
       }
      }
     }
    }
    buttonState2 = val3;                 // save the new state in our variable
  }

  // Now do whatever the lightMode indicates
  if (Mode == 0) { // all-off
    digitalWrite(led3Pin, LOW);
    digitalWrite(led4Pin, LOW);
    digitalWrite(led5Pin, LOW);
  }

  if (Mode == 1) { 
    digitalWrite(led3Pin, HIGH);
    digitalWrite(led4Pin, LOW);
    digitalWrite(led5Pin, LOW);
  }

  if (Mode == 2) { 
    digitalWrite(led3Pin, HIGH);
    digitalWrite(led4Pin, HIGH);
    digitalWrite(led5Pin, LOW);
  }
  if (Mode == 3)  { 
    digitalWrite(led3Pin, HIGH);
    digitalWrite(led4Pin, HIGH);
    digitalWrite(led5Pin, HIGH);
  }    
}