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