### Project 1 Piranha LED Module

![](media/image-20251124172421079.png)

**1.Introduction**
This is a special LED module. When you connect it to ARDUINO development board, after program, it can emit beautiful light. Of course, you can also control it using PWM. It will be like fireflies at night. Isn’t cool? We can also combine it with other sensors to do various interesting interactive experiments.

**2.Specifications**

- Module type: digital
- Working voltage: 5v
- Distance between pins: 2.54mm
- Size: 30*20mm
- Weight: 3g

**3.Connection Diagram**

![](media/image-20251125172411883.png)

**4.Sample Code**

```c
int led = 3; 

void setup()
{
  pinMode(led, OUTPUT);     //Set Pin3 as output
}

void loop()
{      
    digitalWrite(led, HIGH);   //Turn off led
    delay(2000);
    digitalWrite(led, LOW);    //Turn on led
    delay(2000);
}
```