The KY-011 Two Color LED module emits red and green light. You can adjust the intensity of each color using PWM.
Compatible with popular electronics platforms like Arduino, Raspberry Pi, ESP32 and more. This module is similar to the KY-029.
KY-011 Specifications
This module consist of a common cathode 3mm red/green LED, a 0Ω resistor, and 3 male header pins. Since the operating voltage is between 2.0v and 2.5v, you’ll have to use limiting resistors to prevent burnout when connecting to the Arduino.
| Operating Voltage | 2.0v ~ 2.5v |
| Working Current | 10mA |
| Diameter | 3mm |
| Package Type | Diffusion |
| Color | Red + Green |
| Beam Angle | 150 |
| Wavelength | 571nm + 644nm |
| Luminosity Intensity (MCD) | 20-40; 40-80 |
Connection Diagram
Connect the green pin (G) on the board to Pin 10 on the Arduino, connect the red pin (R) to pin 11. Lastly, connect the ground pin (Y) to GND.
We’ll use a couple of resistors between the board and the Arduino to prevent burning the LED.
| KY-011 | Breadboard | Arduino |
|---|---|---|
| G | 330Ω resistor | Pin 10 |
| R | 330Ω resistor | Pin 11 |
| Y | GND |
KY-011 Arduino Code
The following Arduino sketch will gradually alternate between red and green color.
int redpin = 11; // pin for red signal
int greenpin = 10; // pin for green signal
int val;
void setup() {
pinMode(redpin, OUTPUT);
pinMode(greenpin, OUTPUT);
}
void loop() {
for(val = 255; val > 0; val--) {
analogWrite(redpin, val); //dim red
analogWrite(greenpin, 255 - val); // brighten green
delay(15);
}
for(val = 0; val < 255; val++) {
analogWrite(redpin, val); //brighten red
analogWrite(greenpin, 255 - val); //dim green
delay(15);
}
}
Hi, I tried the wiring you suggested but only the red led lights up. I discovered that with my module, the Y is not going to the ground, but is used for the Green led (and G is for ground). I don’t know if my module has a default, but when I check this guide:
https://startingelectronics.org/tutorials/arduino/modules/common-cathode-LED/
(the person used the same module but without the GRY letters on it), from left to right it is: Ground—Red—Green.
Please check that you are using the 3mm module. The 5mm module KY-029 is wired differently.