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node-red-nodes/hardware/PiSrf/README.md

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node-red-node-pisrf
===================
A <a href="http://nodered.org" target="_new">Node-RED</a> node for Raspberry Pi
to read range from an SRF05 Ultrasonic range sensor.
**Only** works with a Raspberry Pi.
Install
-------
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Run the following command in your Node-RED user directory - typically `~/.node-red`
npm install node-red-node-pisrf
Usage
-----
Raspberry Pi input from an SRF04 or SRF05 ultrasonic range finder.
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The configuration requires two GPIO pin numbers, the trigger pin and the echo pin.
These can be any spare valid Pi GPIO pins. e.g.
7,11
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Outputs a `msg.payload` with a number representing the range in cm.
Produces one measure every 0.5s - but only if the distance is different from the previous reading.
**Note:** we are using the actual physical pin numbers on connector P1 as they are easier to locate.