Using an MCP23017 Expander as a Virtual Board (16 Pin Digital IO). Pins 15-17 are used to set the I2C hardware address. By default, these pins must be connected to ground. See page eight of the data sheet

Breadboard for "Expander - MCP23017"

expander-MCP23017.png

Fritzing diagram: expander-MCP23017.fzz

 

Run this example from the command line with:

node eg/expander-MCP23017.js
var five = require("johnny-five");
var board = new five.Board();

board.on("ready", function() {
  var virtual = new five.Board.Virtual(
    new five.Expander("MCP23017")
  );

  var leds = new five.Leds(
    Array.from({ length: 8 }, function(_, i) {
      return new five.Led({ pin: i * 2, board: virtual });
    })
  );

  leds.on();

  this.repl.inject({
    leds: leds
  });
});

 

Component Classes in this example:

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