CJMCU-9813 Full Colour RGB LED Module - I2C Interface

/*
Here's the example code for controlling the CJMCU-9813 Full Colour RGB LED Module using the P9813 driver with an Arduino:

This code sets the RGB LED color to red, green, and blue in sequence, with a 1-second delay between each color change.

Connect the CJMCU-9813 Full Colour RGB LED Module to the Arduino as follows:

VCC pin to 5V (or the appropriate voltage for your module)
GND pin to GND
DATA pin to digital pin 5 on the Arduino
CLK pin to digital pin 4 on the Arduino
Please note that you may need to adjust the pin numbers in the code depending on the specific pins you choose to use for connecting the module to your Arduino.
*/

#include <Arduino.h>

const int clkPin = 4; // Connect this pin to the CLK pin of the module
const int dataPin = 5; // Connect this pin to the DATA pin of the module

void setup() {
  pinMode(clkPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
}

void loop() {
  setColor(255, 0, 0); // Set LED color to red
  delay(1000);

  setColor(0, 255, 0); // Set LED color to green
  delay(1000);

  setColor(0, 0, 255); // Set LED color to blue
  delay(1000);
}

void setColor(byte red, byte green, byte blue) {
  sendFrame(0x00); // Start frame
  sendFrame(((blue & 0xC0) >> 6) | ((green & 0xC0) >> 4) | ((red & 0xC0) >> 2));
  sendFrame(blue);
  sendFrame(green);
  sendFrame(red);
}

void sendFrame(byte value) {
  for (byte bit = 0x80; bit != 0; bit >>= 1) {
    digitalWrite(clkPin, LOW);
    digitalWrite(dataPin, (value & bit) ? HIGH : LOW);
    digitalWrite(clkPin, HIGH);
  }
}