NateZimmer / piStat

Pi Thermostat Powered By Node JS

PI Stat

An affordable thermostat for engineers by engineers.

PI Stat is a 'cloudless' open source smart thermostat project written in Node JS and offers a powerful data gathering and visualization system. This ecosystem is designed to run on low cost (sub 50 USD) hardware.

Note: 12/4/22, project was functional for myself though not sufficiently documented. Hardware exists but using the PI is now in question given how hard it is to source.

Getting Started

1. Obtain undocumented hardware...
2. Clone this repo to your PI.
3. Dependencies:
   • Node 14
4. Run install.sh
5. Edit my_variables.sh file that is generated, create unique passwords & run install.sh again.

install.sh lastly runs:

. ./my_variables.sh && node src/run.js

This ultimately runs node src/run.js which is the top level script with some environment variables containing sensitive variables

Testing

PI Stat uses a mock system combined with a thermal model to verify system functionality. The following is an example test output:

This verifies the business logic while mocking GPIO, temperature, time functions ...etc to run simulated long duration tests.

npm run test

Hardware

For ease of assembly, a basic through-hole PCB was made with easily sourced common hardware. Ironically now, the PI is the un-source-able aspect.