70 lines
2.0 KiB
Markdown
70 lines
2.0 KiB
Markdown
node-red-node-intel-gpio
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========================
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A <a href="http://nodered.org" target="_new">Node-RED</a> node to talk to an Intel
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Galileo or Edison running mraa.
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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 i node-red-node-intel-gpio
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Usage
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-----
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The Galileo or Edison must already be running Linux, and have Node-RED installed.
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See the [Intel Downloads](https://software.intel.com/en-us/iot/home) for
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hardware / downloads for your particular board.
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Ensure the latest version of mraa libraries are installed: (version 1.5 as of Sept 2015)
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echo "src mraa-upm http://iotdk.intel.com/repos/1.5/intelgalactic" > /etc/opkg/mraa-upm.conf
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opkg update
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opkg upgrade
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**NOTE** : This node assumes that the mraa npm is already installed globally - as
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it is on the Galileo and Edison boards.
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If you do need to install Node-RED, you can do this as follows from the home directory of the root user
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npm install -g --unsafe-perm node-red
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mkdir .node-red
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cd .node-red
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npm install node-red-node-intel-gpio
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### Analogue Input Node
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Monitors the selected pin for changes. It outputs on a change of value.
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As analogue inputs are continuously changing you can set the sample rate in ms from 20 to 65535.
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### Digital Input Node
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Monitors the selected pin for changes. It only outputs on a change of value.
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### Digital Output Node
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Sets the selected digital pin output high or low depending on the value of
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`msg.payload` - expects a number or string 0 or 1.
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### Pulse Width Modulation (PWM) Node
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The `msg.payload` should contain a floating point number value
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between 0 (off) and 1 (fully on), or a string representation thereof.
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You can set the overall period (mS) in the edit dialogue.
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For servo control set the period to 20mS and vary the input between 0.05 and 0.10,
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0.05 = 5% of 20mS = 1mS
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0.75 = 7.5% of 20mS = 1.5mS - typical servo centre point
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0.10 = 10% of 20mS = 2mS
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### Example
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Simple flow to blink Pin 13
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...tbd
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