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Raspberry Pi library framework for NodeJS

jsRPi v0.2.6 BETA Copyright (c) CyrusBuilt 2017

A Raspberry Pi GPIO and device/component library framework for NodeJS. This is a port of the the MonoPi Framework (, which is largely based in the pi4j project ( The purpose of this framework is to provide the ability to read/write the GPIO pins on the Raspberry Pi, as well as interface with various devices, and to provide APIs for a number of add-on devices and components as well as interfaces and abstractions for creating your own. This library is under development and not ready for production use. This library has grown into a bit of a "Swiss Army Knife" given the breadth of functionality that is still growing as it is adapted. Most of it is ready, however, I'd love some feed back. This framework will be released as a Node Module and will be installable via NPM at some point in the (hopefully) near future.


This framework has several dependencies (such as underscore, timespan, pi-spi, etc) and several developer dependencies if you intend to build jsRPi yourself. You can install all of these dependencies using the install-deps.cmd script (Windows only) or the (*NIX and Mac OS X). A suite of unit tests are available in the "tests" directory which do simulated testing of most of the framework's classes and functions. However, these tests are platform agnostic and make use of simulated hardware interactions. To test the framework against actual hardware, you will need to run these tests on the Raspberry Pi itself and modify the tests to not use the "fake" hardware (see tests/IO/GpioBase-tests.js for an example), or write your own tests.

A note about (a)synchronous operations:

This framework implements asynchronous operations wherever it can, BUT: there are many operations that are timing sensitive and must occur in a specific order, such as reading/writing from the I2C or SPI bus in a specific order (thus requiring one operation to complete before another) and therefore, these operations currently happen synchronously, which in general goes against the non-blocking nature of NodeJS. Unfortunately, this could not be avoided in many cases but I do have plans try and refactor some of this code in an attempt to make it more asynchronous wherever possible.

ES6 Compliance:

This framework has been ported from ES5-compliant code to ES6. It is recommended that if have implemented an previous versions of the framework (v0.1.x) that you review your code as the v0.2.x code is quite a bit different and will likely break your existing code.

Building jsRPi:

Some scripts have been included to setup and build jsRPi.

  • install_deps.cmd (Windows only)
  • (*NIX and Mac OS X)
  • make.cmd (Windows only)
  • (*NIX and Mac OS X)

To setup the evironment, you will need to do the following:

  • Install NodeJS if you haven't already (
  • Make sure you have the Node Package Manager (npm) installed. This is included in any modern distribution of NodeJS.
  • If on *NIX/OSX you will likely need to make the install_deps script executable by doing the following:
chmod +rx

You can then just call the script like so:


On Windows, just right-click on the install_deps.cmd file and click "Run as Administrator".

  • Once all the dependencies are successfully installed, run the appropriate build script. On *NIX/OSX, you will likely need to make executable, just like as shown above and then call it like so:

On Windows, you can just double-click the make.cmd script, or call it from the command line. The build script will use JSHint to check the code, generate API documentation in the docs/ folder using JSDoc, and then build a single condensed file in the build/ folder using WebPack. You don't have to use the single file. It is only provided for convenience for those who would rather deal with a single file instead of a huge source tree.

Also, if you just want to run unit tests, just navigate to the jsRPi directory from a command line and type:

npm run test


To just run JSHint against all the source and tests:

npm run jshint

To run all unit tests:

npm run test

To run a watch:

npm run watch

To just generate/update API documentation in the /docs folder:

npm run doc

To run a full build:

npm run build


This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

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