MCP23017 16 entrées/sorties sur un arduino

MCP23017 En Entrée

MCP23017 EN

mcp23017.ino

 
 
// MCP23017 Example: Slow key press reaction.
//
// Toggle LEDs and detect keypress.
//
// Example code showing slow reaction of 'button'
// LED to keypress. Leading into why interrupts
// are useful (See next example).
//
// Copyright : John Main
// Free for non commercial use.
 
#include <Wire.h>
#include <Adafruit_MCP23017.h>
 
#define MCP_LED1 7
#define MCP_INPUTPIN 8
#define MCP_LEDTOG1 11
#define MCP_LEDTOG2 4
 
Adafruit_MCP23017 mcp;
 
void setup() {
  mcp.begin();      // Default device address 0
 
  mcp.pinMode(MCP_LEDTOG1, OUTPUT);  // Toggle LED 1
  mcp.pinMode(MCP_LEDTOG2, OUTPUT);  // Toggle LED 2
 
  mcp.pinMode(MCP_LED1, OUTPUT);     // LED output
  mcp.digitalWrite(MCP_LED1, HIGH);
 
  mcp.pinMode(MCP_INPUTPIN,INPUT);   // Button i/p to GND
  mcp.pullUp(MCP_INPUTPIN,HIGH);     // Puled high to ~100k
}
 
// Alternate LEDTOG1 and LEDTOG2.
// Transfer pin input to LED1.
void loop() {
 
  delay(300);
 
  mcp.digitalWrite(MCP_LEDTOG1, HIGH);
  mcp.digitalWrite(MCP_LEDTOG2, LOW);
 
  delay(300);
 
  mcp.digitalWrite(MCP_LEDTOG1, LOW);
  mcp.digitalWrite(MCP_LEDTOG2, HIGH);
 
  // Transfer input pin state to LED1
  if (mcp.digitalRead(MCP_INPUTPIN)) {
     mcp.digitalWrite(MCP_LED1,HIGH);
  } else {
     mcp.digitalWrite(MCP_LED1,LOW);
  }
 
}