// Timing of 4 things, starting 40ms after each other, staying active 140ms.
//
// Forum: https://forum.arduino.cc/t/asking-questions-for-i2c-channel-communication/1186203/16
// This Wokwi project: https://wokwi.com/projects/380693069509691393
//
// I can think of 4 good solutions.
// This is with delays.
// The code will do that sequence at the press of a button.

const int buttonPin = 2;

void setup() 
{
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
}

void loop() 
{
  int button = digitalRead(buttonPin);
  if(button == LOW)
  {
    digitalWrite(4, HIGH);
    delay(40);
    digitalWrite(5, HIGH);
    delay(40);
    digitalWrite(6, HIGH);
    delay(40);
    digitalWrite(7, HIGH);
    delay(20);
    digitalWrite(4, LOW);
    delay(40);
    digitalWrite(5, LOW);
    delay(40);
    digitalWrite(6, LOW);
    delay(40);
    digitalWrite(7, LOW);
  }
}