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67 lines
1.9 KiB
Markdown
67 lines
1.9 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
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<a href="http://www.piface.org.uk/products/piface_digital/" target="_new">PiFace Digital</a>
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add-on board for a Raspberry-Pi.
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**Note:** Some later versions of the PiFace relabelled the switch inputs to be `0 - 7`
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instead of `1 - 8` as on the original boards.
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We cannot automatically detect this so the user will have to apply some common sense.
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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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Device Tree **must** be turned off. To do this run
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sudo raspi-config
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then select the `Advanced Options`, then `Device Tree`, and finally select `No`
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and `OK`. You will then need to reboot.
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It also requires the WiringPi gpio command to be installed in order to work.
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See the <a href="http://wiringpi.com" target="new">WiringPi site</a>
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for details on how to do this. The short version is...
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sudo apt-get install git-core
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git clone git://git.drogon.net/wiringPi
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cd wiringPi
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git pull origin
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./build
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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
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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
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depending on the value passed in. Expects a <b>msg.payload</b> with either a
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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
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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
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as it loads the cpu.
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