### Project 9 RGB LED

![](media/image-20251121165840096.png)

**1. Introduction:**
Tricolor principle to display various colors;PWM controlling ports to display full color;Can be driven directly by Arduino PWM interfaces.

![](media/image-20251121165920580.png)

**2. Hardware Required:**

- Arduino controller × 1
- USB cable × 1
- Full-color LED module × 1

**3. Connection for REV4**

![](media/image-20251121165953455.png)

**4. Connection for 2560 R3**

![](media/image-20251121170153790.png)

**5. Sample Code**

```c
int redpin = 11; //select the pin for the red LED
int bluepin =10; // select the pin for the blue LED
int greenpin =9;// select the pin for the green LED

int val;

void setup() 
{
  pinMode(redpin, OUTPUT);
  pinMode(bluepin, OUTPUT);
  pinMode(greenpin, OUTPUT);
  Serial.begin(9600);
}

void loop() 
{
	for(val=255; val>0; val--)
  	{
       analogWrite(11, val);
       analogWrite(10, 255-val);
       analogWrite(9, 128-val);
       delay(1); 
  	}
	for(val=0; val<255; val++)
 	{
       analogWrite(11, val);
       analogWrite(10, 255-val);
       analogWrite(9, 128-val);
       delay(1); 
  	}
 	Serial.println(val, DEC);
}
```

**Result:**
Directly copy the above code into arduino IDE, and click upload![](media/6.png),wait for a few seconds, you can see a full-color LED.

![](media/image-20251121170358560.png)