How to control RBG LED through port monitor on Arduino?

Question

Arduino

I want, for example, when you enter R 255 into the COM port, a signal goes to the pin and the red LED lights up, or I write G 150 and then B 200 and it turns out like a dark blue color, or for example I write R 0 , then G 0 , and B 0 and then the LED goes out.

Answer 1

Here is a similar program once wrote. Does almost what you need.
The code is as simple and clear as possible.

int red_pin = 11;
int green_pin = 10;
int blue_pin = 9;
int common_pin = A0;
int incoming_data = 0;

void setup() {
  pinMode(red_pin, OUTPUT);
  pinMode(green_pin, OUTPUT);
  pinMode(blue_pin, OUTPUT);
  pinMode(common_pin, OUTPUT);
  digitalWrite(red_pin, HIGH);
  digitalWrite(green_pin, HIGH);
  digitalWrite(blue_pin, HIGH);
  digitalWrite(common_pin, HIGH);
  Serial.begin(9600);
}

void loop() {
  if (Serial.available() > 0) {
    incoming_data = Serial.read();
  };
 
  if ((incoming_data & B00000010) != 0) {
    digitalWrite(red_pin, LOW);
  } else {
    digitalWrite(red_pin, HIGH);
  };

  if ((incoming_data & B00000100) != 0) {
    digitalWrite(green_pin, LOW);
  } else {
    digitalWrite(green_pin, HIGH);
  };

  if ((incoming_data & B00001000) != 0) {
    digitalWrite(blue_pin, LOW);
  } else {
    digitalWrite(blue_pin, HIGH);
  };

  if ((incoming_data & B00000001) != 0) {
    digitalWrite(common_pin, LOW);
  } else {
    digitalWrite(common_pin, HIGH);
  }
}

The only difference is that the channels to be lit are determined by the least significant bits of the input number.