i2c

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

  • i2c

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

Install

````bash $ npm install i2c ````

Usage

```javascript
var i2c = require('i2c'); var address = 0x18; var wire = new i2c(address, {device: '/dev/i2c-1'}); // 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
// plain read/write
wire.write(byte0, byte1, function(err) {});
wire.read(length, function(err, res) { // result contains a buffer of bytes });
````

Raspberry Pi Setup

````bash $ sudo vi /etc/modules ````
Add these two lines
````bash i2c-bcm2708 i2c-dev ````
````bash $ sudo vi /etc/modprobe.d/raspi-blacklist.conf ````
Comment out blacklist i2c-bcm2708
````
blacklist i2c-bcm2708
````
Load kernel module
````bash $ sudo modprobe i2c-bcm2708 $ sudo modprobe i2c-dev ````
Make device writable
````bash sudo chmod o+rw /dev/i2c ````
Install gcc 4.8 (required for Nan)
````bash sudo apt-get install gcc-4.8 g++-4.8 sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.6 sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 40 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8 sudo update-alternatives --config gcc
````
Set correct device for version
```javascript
new i2c(address, device: '/dev/i2c-0') // rev 1 new i2c(address, device: '/dev/i2c-1') // rev 2
````

Beaglebone

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

Node 0.11 and under

````bash npm install i2c@0.1.8 ````

Projects using i2c

  • bonescript https://github.com/jadonk/bonescript/
  • ADXL345 https://github.com/timbit123/ADXL345
  • HMC6343 https://github.com/omcaree/node-hmc6343
  • LSM303 https://github.com/praneshkmr/node-lsm303
  • MPU6050 https://github.com/jstapels/mpu6050/
  • MCP3424 https://github.com/x3itsolutions/mcp3424
  • blinkm https://github.com/korevec/blinkm
  • click boards https://github.com/TheThingSystem/node-click-boards
  • more: https://www.npmjs.org/browse/depended/i2c

Contributors

Thanks to @alphacharlie for Nan rewrite, and @J-Cat for Node 14 updates.

Questions?

http://www.twitter.com/korevec