Updated OCT 28 2017, 2017 by K. Waite
A Node server single page app for Raspberry Pi with emphasis on electronics. Hack it , mod it, delete and extend parts as as you wish.
This software runs on your pi [tested on Raspberry Pi 3 but will work with others] and outputs a web page to port 3000 which you can access from any device on your local network.
This software is based on Node.js plus Express & Socket.io., and has not even explored all of the functions available in the (npm) pigpio library. Many thanks to Brian Cooke (fivdi) for his work providing us this C wrapper!
It provides a basic setup which displays the CPU die temperature, Pi and Node versions running. It also provides the following built-ins, ready to go out of the box:
- Turn On/ OFF a device. Simply outputs a high or low level from a GPIO pin.
- Software PWM out
- Hardware PWM out on available pins
- Measure an incoming pulse width
- Output a trigger pulse [rising or falling edge] , with or without an external trigger.
- SPI Master on bus 0, device 0 to connect with your favorite dev board, whether it be a PSOC, and Arduino, or whatever.
You may add, remove or alter functions as you wish.This requires only a basic knowledge of html, css and jquery. The socket.io library provides a mechanism to both send your data from your pi to web, and send commands from the web page, without re-loading the page. I have commented the code pretty heavily to make it easier for those of us not so familiar with Node & Socket.io. Note that this project uses the npm pig-pio library - you must run piframe.js as root.
The pi in isolation is not so powerful regarding electronics, however it makes a truly wonderful command & display interface for other devices. In the "MyApp" web section there is a hookup for SPI to your favorite electronic development board [or device]. We can now dispense with LCD displays, switches, buttons, etc., by sending & receiving data via your pi. In addition to data & commands, we can also send electronic triggers and signals to our boards and devices, such as http://www.cypress.com/products/32-bit-arm-cortex-m4-psoc-6.
FILES:
- Clone to pi to receive piFrame
- piWiki - a tiddlywiki of my pi notes, use as your own digital pi workbook, edit as desired. http://tiddlywiki.com/
- piFrame.zip - download all files excluding Node modules, rebuild these from package.json
- Pi-startSSH.sh - a Bash script to find the Pi's address by scanning or using the last known address, and log you in via SSH.
- GPIO-test - not written by me - Bash script used to test your Pi pins.
For help on installation & usage click here