MCP23017

#include <Adafruit_MCP23X17.h>
 
Adafruit_MCP23X17 mcp;

void setup()
{
  if (!mcp.begin_I2C()) {
    Serial.println("MCP23017 Error");
    while (true);
  }
 
  mcp.pinMode(numer_pinu, INPUT);
  mcp.pinMode(numer_pinu, OUTPUT);
}

mcp.digitalRead(numer_pinu)  // odczyt (LOW, HIGH)
 
mcp.digitalWrite(numer_pinu, HIGH);  // ustawienie (LOW, HIGH)