### Project 6 LED Chasing Effect

![](media/image-20260127120121893.png)

**1.Project instruction**

Flow light is commonly viewed in our daily life, such as on building, advertisement board and so on. We will show you how to make a flow light in this part.

**2.Project circuit**

![](media/image-20260127120151007.png)

**3.Project code**

```c
int  redled = 8;
int  greenled = 10;
int  yellowled =13;

void  setup()
{
    pinMode(redled, OUTPUT);
    pinMode(greenled, OUTPUT);
    pinMode(yellowled, OUTPUT);
}
void loop()
{
    digitalWrite(redled, HIGH);//turn on red light
    delay(100);//delay in 0.1s
    digitalWrite(redled, LOW); //turn off red light
    delay(100);//delay in 1s
    digitalWrite(greenled, HIGH);//turn on green light
    delay(100);//delay in 0.1s
    digitalWrite(greenled, LOW);//turn off green light
    delay(100);//delay in 0.1s
    digitalWrite(yellowled, HIGH);//turn on yellow light
    delay(100);//delay in 0.1s
    digitalWrite(yellowled, LOW);//turn off yellow light
    delay(100);//delay in 0.1s
}
```