Raspberry Pi Smart Thermostat

This project uses Flask for the backend, Bootstrap for the frontend, and Chart.JS for the data visualizations.

Required Hardware

• Electronics-Salon Relay Board
• Lechacal RPICT3T1 Current and Temperature Sensor -- we are only using the temperature portion
• Raspberry Pi -- I used a 3B+ but other versions will likely work too.

Installation Instructions

1. Assemble the hardware however you like. I used standoffs to stack the three components, but you could use a breadboard as well.

2. Connect the thermostat wires to the relays as follows:

   1. Connect the R wire (either Rh or Rc) to the C terminal on relay 1
   2. Connect all the C terminals on all three relays together
   3. Connect the W wire to the NO terminal on relay 1 (this controls the heat)
   4. Connect the G wire to the NO terminal on relay 2 (this controls the fan)
   5. Connect the Y wire to the NO terminal on relay 3 (this controls the A/C)

3. Download and extract the source code to a folder of your choosing

4. Install virtualenv and virtualenvwrapper (skip to step 4 if you have these already).

   pip3 install virtualenv virtualenvwrapper

   You will also need to make some changes to your ~/.bashrc file for virtualenvwrapper to work properly, see here.

5. Create a virtual environment for the project and switch into it

   mkvirtualenv smarttthermostat
   workon smartthermostat

6. Install the Python dependencies

   pip3 install -r requirements.txt

7. Open static/settings.json and set your initial preferred temperature setpoint and tolerance, and indicate whether your home has heating and/or A/C by typing true or false where appropriate. Save the file.

8. Launch the app

   python3 main.py

9. Open the web interface to see your thermostat at work! By default, the web server runs on port 5000.