Example Code for Arduino-LED Blink

Hardware Preparation

• Gravity: Digital LED Light Module (SKU:DFR0021 x 1) Any color
• DFRduino UNO R3 with IO Expansion Shield and USB Cable A-B (SKU:DFR0216-2 x 1)

Software Preparation

• Development Tool: Arduino IDE (version unspecified). Download link: Arduino IDE

Wiring Diagram

Sample Code

///Arduino Sample Code for DFR0021
///www.DFRobot.com
///Last modified on 26th February 2015

int led = 3;

void setup()
{
  pinMode(led, OUTPUT);     //Set Pin3 as output
}
void loop()
{
          digitalWrite(led, HIGH);   //Turn on led
          delay(2000);
          digitalWrite(led, LOW);    //Turn off led
          delay(2000);
}

Result

Turn on for two seconds, turn off for two seconds, and repeat in a loop.