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