README
i2c
Bindings for i2c-dev. Plays well with Raspberry Pi and Beaglebone.
Based on kelly/node-i2c, converted from CoffeeScript to TypeScript and from callbacks to promises, but with only a subset of the original project's methods.
Install
$ yarn add @jcoreio/i2c
Usage
import I2C from '@jcoreio/i2c'
const i2c = new I2C({ device: '/dev/i2c-1', address: 0x50 })
const OFFSET = 16
// In an async function
const writeData = Buffer.alloc(8)
try {
await i2c.write(OFFSET, writeData)
// wait 1 ms before reading back
await new Promise(resolve => setTimeout(resolve, 1))
// read back
const readData = await i2c.read(OFFSET, 8)
} finally {
i2c.close()
}
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
$ sudo modprobe i2c-dev
Make device writable
sudo chmod o+rw /dev/i2c*
Install gcc 4.8 (required for Nan)
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
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
$ opkg install python-misc
$ npm config set strict-ssl false
$ npm install i2c
Node 0.11 and under
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.