آموزش راه اندازی برد توسعه ورودی-خروجی 16 کاناله MCP23017 با آردوینو

   /*
Modified on Dec 15, 2020
Modified by MehranMaleki from Arduino Examples
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*/



#include <Wire.h>
#include "Adafruit_MCP23017.h"

// Basic pin reading and pullup test for the MCP23017 I/O expander
// public domain!

// Connect pin #12 of the expander to Analog 5 (i2c clock)
// Connect pin #13 of the expander to Analog 4 (i2c data)
// Connect pins #15, 16 and 17 of the expander to ground (address selection)
// Connect pin #9 of the expander to 5V (power)
// Connect pin #10 of the expander to ground (common ground)
// Connect pin #18 through a ~10kohm resistor to 5V (reset pin, active low)

// Output #0 is on pin 21 so connect an LED or whatever from that to ground

Adafruit_MCP23017 mcp;
  
void setup() {  
  mcp.begin();      // use default address 0

  mcp.pinMode(0, OUTPUT);

  Serial.begin(9600);
}


// flip the pin #0 up and down

void loop() {
  int x;
  

  mcp.digitalWrite(0, HIGH);
  x = mcp.digitalRead(0);

  int i;
  for(i = 0; i < 40; i++)  {
    Serial.println(x);
    delay(50);
  }


  mcp.digitalWrite(0, LOW);
  x = mcp.digitalRead(0);
  for(i = 0; i < 40; i++)  {
    Serial.println(x);
    delay(50);
  }
}