PCF8574
PCF8574 simple io write code
- Default IIC address 0x20
#include "PCF8574.h"
#include <Wire.h>
// adjust addresses if needed
PCF8574 PCF_38(0x20); // add led to P0 (pin 4) (used as output)
void setup()
{
//your setup code here
}
void loop()
{
//turn P0 (pin 4) of the I/O expander on and off once a second
PCF_38.write(0, 1);
delay(1000);
PCF_38.write(0, 0);
delay(1000);
}