How to Use Ky-009: Examples, Pinouts, and Specs

The KY-009 is a compact RGB LED module designed for creating vibrant and customizable lighting effects. It features three LEDs (Red, Green, and Blue) housed in a single package, allowing for the generation of a wide range of colors through Pulse Width Modulation (PWM). This module is ideal for projects requiring colorful lighting, such as decorative displays, status indicators, or interactive designs. Its small size and ease of use make it a popular choice for hobbyists and professionals alike.

• Decorative lighting and displays
• Status indicators for electronic devices
• Interactive projects and prototypes
• Educational projects for learning about PWM and color mixing

• Operating Voltage: 5V DC
• Current Consumption: ~20mA per LED (typical)
• LED Colors: Red, Green, Blue
• Control Method: PWM for each color channel
• Dimensions: 18.5mm x 15mm x 2.5mm (approx.)
• Connector Type: 4-pin header

1. Power Supply: Connect the GND pin of the KY-009 module to the ground of your power source or microcontroller.
2. PWM Control: Connect the R, G, and B pins to PWM-capable pins on your microcontroller. These pins control the brightness of the Red, Green, and Blue LEDs, respectively.
3. Resistors: Use appropriate current-limiting resistors (typically 220Ω to 330Ω) in series with each LED pin to prevent overcurrent damage.
4. Programming: Use PWM signals to adjust the brightness of each LED, mixing colors as needed.

• Ensure the total current draw does not exceed the microcontroller's pin current limits.
• Use external transistors or MOSFETs if higher current is required for brighter LEDs.
• Avoid connecting the module directly to a power source without resistors, as this may damage the LEDs.

The following example demonstrates how to control the KY-009 module using an Arduino UNO. It cycles through different colors by adjusting the PWM signals.

// Define the PWM pins connected to the KY-009 module
const int redPin = 9;   // Red LED pin
const int greenPin = 10; // Green LED pin
const int bluePin = 11;  // Blue LED pin

void setup() {
  // Set the RGB pins as output
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void loop() {
  // Set the LED to red
  analogWrite(redPin, 255);  // Full brightness for red
  analogWrite(greenPin, 0);  // Green off
  analogWrite(bluePin, 0);   // Blue off
  delay(1000);               // Wait 1 second

  // Set the LED to green
  analogWrite(redPin, 0);    // Red off
  analogWrite(greenPin, 255); // Full brightness for green
  analogWrite(bluePin, 0);   // Blue off
  delay(1000);               // Wait 1 second

  // Set the LED to blue
  analogWrite(redPin, 0);    // Red off
  analogWrite(greenPin, 0);  // Green off
  analogWrite(bluePin, 255); // Full brightness for blue
  delay(1000);               // Wait 1 second

  // Set the LED to white (all colors on)
  analogWrite(redPin, 255);  // Full brightness for red
  analogWrite(greenPin, 255); // Full brightness for green
  analogWrite(bluePin, 255); // Full brightness for blue
  delay(1000);               // Wait 1 second
}

1. LEDs Not Lighting Up:

   • Check the connections to ensure the R, G, and B pins are connected to PWM-capable pins.
   • Verify that the GND pin is properly connected to the ground of the power source.
   • Ensure current-limiting resistors are in place and of the correct value.

2. Incorrect Colors:

   • Verify the PWM values being sent to each pin. Incorrect values can result in unexpected colors.
   • Check for loose or swapped connections between the module and the microcontroller.

3. Dim or Flickering LEDs:

   • Ensure the power supply provides sufficient current for the module.
   • Check for poor solder joints or loose connections.

• Use a multimeter to verify voltage levels at the module's pins.
• Test each LED channel (R, G, B) individually by connecting it to a 5V source with a resistor.
• If using an external power source, ensure it shares a common ground with the microcontroller.

By following this documentation, you can effectively integrate the KY-009 RGB LED module into your projects and create stunning lighting effects.