This version of the source code has been forked from https://github.com/nielsnl68/node-red-contrib-i2c by Cedric Priscal.
It adds support for the selection of the I2C port to use.
This node should work on any system supported by the i2c-bus package but has been only tested on Raspberry Pi.
This set of node-red nodes communicate with the Raspberry Pi I2C driver and uses the node-I2C package. Run the following command in the root directory of your Node-RED install, usually this is ~/.node-red.
npm install --unsafe-perm github:cepr/node-red-contrib-i2c
Provides three nodes - one to scan connected device, one to receive messages, and one to send.
When you start using one of the below nodes you need first to configure the I2C Device.
The Raspberry PI uses an special device name to connect to the I2C controller.
Depending on the Raspberry PI version it can be one of the below values; for the RPi Rev 1 it /dev/i2c-0 and all Others it will be /dev/i2c-1 (=default).
In the config screen you can also set the default I2C-address to where the node sends the Messages and requests.
This will scan the I2C bus for connected devices. It has one input to trigger the scan process and 2 outputs:
- The first output gives a list of all found devices in msg.payload and will be triggered once.
- The second output will be triggered for every found device. The address will be in msg.payload
This node will request data from a given device. The address and command can both be set in the dialog screen or dynamically with msg.address and msg.command. This node outputs the result as a buffer in msg.payload and places the address in msg.address and command in msg.command.
This node will send a given String/array/buffer to a given device. The address and command can both be set in the dialog screen or dynamically with msg.address and msg.command. The payload can be set statically or dynamically (using msg.payload).
This payload can be a Buffer, Array, String or Integer. When you use integers the number of bytes to send is important and can be set between 0 and 31 bytes.
NEW(0.5.0): you can daisychain this node, the input msg is send unchanged to the next node.