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node-red-node-piface
Node-RED nodes to control a PiFace Digital add-on board for a Raspberry-Pi.
Install
Run the following command in the root directory of your Node-RED install
npm install node-red-node-piface
Pre-reqs
Requires the WiringPi gpio command to be installed in order to work. See the WiringPi site for details on how to do this.
Usage
A pair of input and output Node-RED nodes for the Raspberry Pi PiFace Digital add-on board.
###Output
The PiFace output node will set the selected relay, LED, or pin on or off depending on the value passed in. Expects a msg.payload with either a 1 or 0 (or true or false).
Requires the WiringPi gpio command in order to work (see pre-reqs).
###Input
The PiFace input node generates a msg.payload with either a 0 or 1 depending on the state of the input pin.
You may also enable the input pullup resistor if required.
The msg.topic is set to piface/{the pin number}
Requires the WiringPi gpio command in order to work (see pre-reqs).
Note: This node currently polls the pin every 250mS. This is not ideal as it loads the cpu.