Edison GPIO Example

This demo is to show how to control the Edison's GPIOs using a web interface with a NodeJS server running on the Edison, with the Edison Ethernet board.

Software Setup

1. Clone the repo onto the Edison (or your dev environment):

   git clone https://github.com/LGSInnovations/edison-gpio-example.git

2. cd into the edison-gpio-example directory and install dependencies:

   cd edison-gpio-example/
   npm install && bower install

   Note: In order to do this, you must have node and npm installed. Then to install bower run npm install bower --global

3. The app will look for the PORT environment variable to listen on a particular port. If none is found, it will default to port 8080 and the app will be accessible through your IP address and port or locally at http://localhost:8080. To use a different port (like the standard port 80), export the PORT variable before running the app:

   export PORT=80

4. Use node or nodemon to run the app:

   nodemon app.js

   Note: nodemon is a utility that automatically checks for updates and restarts the node server, which is great for development. You can alternatively run node app.js but you will have to restart the server if you change any code. Run npm install nodemon --global to install nodemon.

Hardware Setup

The following pin configuration is assumed, using the SparkFun GPIO Block (see image below):

GPIO Pin	Component	MRAA Pin (in code)
GP44	Green LED	31
GP45	Yellow LED	45
GP46	Red LED	32
GP47	Red LED	46
GP48	Yellow LED	33
GP49	Green LED	47
GP15	Button tied high w/ 1K pull-down	48
GP14	Unused	36