Example Code for Arduino-GPIO Digital Write

Last revision 2026/01/08

This article offers a comprehensive guide on using Arduino for GPIO digital write, detailing hardware setup, wiring connection, and sample code to illuminate an LED module, specifically utilizing the Beetle RP2350 board.

Hardware Preparation

DFR1188 Beetle RP2350 ×1
DFR0021-R Gravity: Digital Yellow LED Light Module ×1

Wiring Diagram

Connection

Mainboard	Pin name	Module	Pin name
Beetle RP2350	GND	LED Light Module	GND
Beetle RP2350	3V3	LED Light Module	VCC
Beetle RP2350	4	LED Light Module	D

Sample Code

int ledPin = 4; //  Define LED pin
void setup(){
   pinMode(ledPin, OUTPUT); 
   digitalWrite(ledPin, HIGH);
}

void loop(){
}

Result

After the program is uploaded, you can see the blue LED light up.

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