Illuminated push buttons

Using Arduino LEDs and Multiplexing
#1

Hi All

I have 10 illuminated push button with LED’s (Button is button and LED is LED).

When I push Button 1 LED 1 needs to turn on HIGH and when im realesing the button LED 1 shall go back to low.
I can get it to Work with 2 buttons but when i am trying with 3 button it goes wrong (and I need it to Work with 10 buttons).

If im using this code:

void setup() {
  // put your setup code here, to run once:
  pinMode(3, OUTPUT);//This is LED for Button 1
  pinMode(5, OUTPUT);//This is LED for Button 2
  pinMode(7, OUTPUT);//This is LED for Button 3
  pinMode(2, INPUT);//This is Button 1
  digitalWrite(2, HIGH);
  pinMode(4, INPUT);
  digitalWrite(4, HIGH);//This is Button 2
  pinMode(6, INPUT);
  digitalWrite(6, HIGH);//This is Button 3
  
}

void loop() {
  if (digitalRead(2) == LOW)
{
  digitalWrite(3, HIGH);
}
else if (digitalRead(4) == LOW)
{
  digitalWrite(5, HIGH);
}

else if (digitalRead(6) == LOW)
{
  digitalWrite(7, HIGH);
}
else
{
  digitalWrite(3, LOW);
  digitalWrite(5, LOW);
  digitalWrite(7, LOW);
}
}

Hope someone will help.

Best regard
Soren

#2

Hi Soren, try this:

const int button[] = {2, 4, 6};
const int led[] = {3, 5, 7};

void setup() {

  for (int i = 0; i < 3; i++) {
    pinMode(led[i], OUTPUT);
    pinMode(button[i], INPUT_PULLUP);
  }
}

void loop() {

  for (int i = 0; i < 3; i++) {
    digitalWrite(led[i], ~digitalRead(button[i]));
  }
}

Paul

#3