Example Code for Arduino-LED Control with Button

Hardware Preparation

• DFRduino UNO x1
• IIC to GPIO Shield V2.0 x1
• digital push Button module
• Digital LED module

Software Preparation

• Arduino IDE V1.6.5 Click to Download Arduino IDE from Arduino®

Wiring Diagram

Other Preparation Work

In this section, we will use an Arduino library written by nicoverduin
Github Library. About Library installation.

Sample Code

#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif

#include "clsPCA9555.h"
#include "Wire.h"


PCA9555 ioport(0x20);

void setup()
{
  ioport.pinMode(7, OUTPUT); //Set GPIOs pinMode LED
  ioport.pinMode(8, INPUT);  //Button
}

void loop()
{
  if (ioport.digitalRead(ED8) == LOW) {
    ioport.digitalWrite(7, LOW);                  //Turn off Led
  }

  if (ioport.digitalRead(ED8) == HIGH) {
    ioport.digitalWrite(7, HIGH);                 //Turn on Led
  }

}