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https://github.com/kelly/node-i2c
Node.js native bindings for i2c-dev. Plays well with Raspberry Pi and Beaglebone.
https://github.com/kelly/node-i2c
Last synced: about 2 months ago
JSON representation
Node.js native bindings for i2c-dev. Plays well with Raspberry Pi and Beaglebone.
- Host: GitHub
- URL: https://github.com/kelly/node-i2c
- Owner: kelly
- License: other
- Created: 2013-02-14T18:40:47.000Z (over 11 years ago)
- Default Branch: master
- Last Pushed: 2022-02-14T13:53:32.000Z (over 2 years ago)
- Last Synced: 2024-07-26T11:43:23.286Z (about 2 months ago)
- Language: C
- Homepage:
- Size: 68.4 KB
- Stars: 216
- Watchers: 26
- Forks: 91
- Open Issues: 36
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-starred - kelly/node-i2c - Node.js native bindings for i2c-dev. Plays well with Raspberry Pi and Beaglebone. (others)
README
# 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 [email protected]
````
## 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