RGB LED Cathode pin issue

[Phone Khant Kyaw (Tyron)]

Description: The Cathode pin of RGB LED should only be connected to the GND pin or a digitally programmed 0 pin for RGB LED to work. In scenarios mentioned below, it is working when connected to any pin.

Cathode pin

Scenarios:

Cathode pin connected to an unconnected resistor

Cathode pin connected to a 5V pin

Steps to Reproduce

1. Connect as shown above
2. Copy .ino code

void setup(){
	pinMode(11, OUTPUT);
	pinMode(9, OUTPUT);
	pinMode(7, OUTPUT);
}

void loop(){
	for(int i=1;i<=7;++i){
        digitalWrite(11, i&1);
        digitalWrite(9, (i>>1)&1);
        digitalWrite(7, (i>>2)&1);
        delay(1000);
    }
}

3. Press "Start Simulation"
4. RGB LED will work

Expected Behavior:Should only work when Cathode pin is connected to GND or digitally programmed LOW (0) pin.

RGB LED.webm
Video of above scenarios

Version and OS:

• OS: Ubuntu 22.04.1 LTS
• Browser: Firefox 110

Tested on

• develop
• simulation.iitbx.in

[Firuza Aibara]

fixed in #481