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33 lines
939 B
Markdown
33 lines
939 B
Markdown
node-red-node-pisrf
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===================
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A <a href="http://nodered.org" target="_new">Node-RED</a> node for Raspberry Pi
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to read range from an SRF05 Ultrasonic range sensor.
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**Only** works with a Raspberry Pi.
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Install
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-------
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Run the following command in your Node-RED user directory - typically `~/.node-red`
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npm install node-red-node-pisrf
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Usage
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-----
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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.
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These can be any spare valid Pi GPIO pins. e.g.
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7,11
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You can also set the repeat frequency of measurements - default 0.5 seconds.
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Outputs a `msg.payload` with a number representing the range in cm.
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Produces one measure every 0.5s (by default) - but only if the distance is different from the previous reading.
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**Note:** we are using the actual physical pin numbers on connector P1 as they are easier to locate.
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