i2c

Native bindings for i2c-dev. Plays well with Raspberry Pi and BeagleBone.

npm install i2c
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i2c

Bindings for i2c-dev. Plays well with Raspberry Pi and Beaglebone.

Install

$ npm install i2c

Usage


var i2c = require('i2c');
var address = 0x18;
var wire = new i2c(address, {device: '/dev/i2c-1', debug: true}); // point to your i2c address, debug provides REPL interface

wire.scan(function(err, data) {
  // result contains an array of addresses
});

wire.writeByte(byte, function(err) {});

wire.writeBytes(command, [byte0, byte1], function(err) {});

wire.readByte(function(err, res) { // result is single byte })

wire.readBytes(command, length, function(err, res) {
  // result contains a buffer of bytes
});

wire.on('data', function(data) {
  // result for continuous stream contains data buffer, address, length, timestamp
});

wire.stream(command, length, delay); // continuous stream, delay in ms


`

Raspberry Pi Setup

$ sudo vi /etc/modules

Add these two lines

i2c-bcm2708 
i2c-dev
$ sudo vi /etc/modprobe.d/raspi-blacklist.conf

Comment out blacklist i2c-bcm2708

#blacklist i2c-bcm2708

Load kernel module

$ sudo modprobe i2c-bcm2708

Make device writable

sudo chmod o+rw /dev/i2c*

Set correct device for version


new i2c(address, device: '/dev/i2c-0') // rev 1
new i2c(address, device: '/dev/i2c-1') // rev 2

`

Beaglebone

$ ntpdate -b -s -u pool.ntp.org
$ opkg update
$ opkg install python-compile
$ opkg install python-modules
$ npm config set strict-ssl false
$ npm install i2c

Projects using i2c

Questions?

http://www.twitter.com/korevec

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