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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
-------
Run the following command in the root directory of your Node-RED install.
This is usually `~/.node-red`
npm install node-red-node-pisrf
Usage
-----
Raspberry Pi input from an SRF04 or SRF05 ultrasonic range finder.
The configuartion 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
Outputs a <b>msg.payload</b> 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.