node-red-node-intel-gpio ======================== A Node-RED node to talk to an Intel Galileo or Edison running mraa. Install ------- Run the following command in the root directory of your Node-RED install, usually this is ~/.node-red . npm install node-red-node-intel-gpio Usage ----- The Galileo or Edison must already be running Linux, and have Node-RED installed. See the [Intel Downloads](https://software.intel.com/en-us/iot/home) 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 ### Analogue Input Node Monitors the selected pin for changes. It outputs on a change of value. As analogue inputs are continously changing you can set the sample rate in ms from 20 to 65535. ### Digital Input Node Monitors the selected pin for changes. It only outputs on a change of value. ### Digital Output Node Sets the selected digital pin output high or low depending on the value of **msg.payload** - expects a number or string 0 or 1. ### Pulse Width Modulation (PWM) Node 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 ### Example Simple flow to blink Pin 13 ...tbd