Make LED light up from serial monitor - Programming Questions - Arduino Forum

I want to controll red diode with a comand, blue diode with a comandand same with green. 3 different if statements. I want it as basic as possible so I can understand the code const int RED = 9; const int GREEN = 8; const int BLUE = 7; void setup() { pinMode(RED, OUTPUT); pinMode(GREEN, OUTPUT); pinMode(BLUE, OUTPUT); } void loop() { digitalWrite(RED, HIGH); digitalWrite(GREEN, HIGH); digitalWrite(BLUE, HIGH); }

ATMEGA328P with Arduino IDE: Serial communication doesn't work in combination with delay()-function

Commands with serial monitor - Programming Questions - Arduino Forum

Larson scanner coding issue. please help - Project Guidance - Arduino Forum

unable to use RGB matrix and the serial monitor at once - Programming Questions - Arduino Forum

Question marks in serial monitor, but baud are the same - Project Guidance - Arduino Forum

My Serial Monitor is BLANK! - IDE 2.x - Arduino Forum

Lost, I build this with wokwi. It's a TopTechBoy(Paul McWhoter) lesson. The red led works fine, but not the yellow? Any ideas on where to begin to debug? I am scared to ask any project question, but I have to keep trying to learn. : r/arduino

Using Bluetooth Data serial freezing after second and rework after second - Programming Questions - Arduino Forum

Serial Monitor stops working randomly - IDE 1.x - Arduino Forum