Analogue thermostat smart conversion

This project uses a 3d printed linear actuator apparatus, a raspberry pi and a servo to convert an analogue thermostat to a smart thermostat.

• Download and 3d print the following

  • linear actuator apparatus here: https://www.tinkercad.com/things/b8V2VNzX3zA-linearactuator
  • Power bank holder https://www.tinkercad.com/things/3N6urT88Hxt

• Get the following parts

  • Servo https://core-electronics.com.au/df05bb-standard-servo-5kg.html
  • Rasperry pi zero wh https://core-electronics.com.au/catalogsearch/result/?q=pi+zero+wh
  • SD card https://core-electronics.com.au/sd-microsd-memory-card-16gb-class-10.html
  • Jumper wires https://core-electronics.com.au/jumper-wires-7-8-f-m-high-quality-30-pack.html
  • Micro USB cable https://core-electronics.com.au/micro-usb-cable.html
  • USB power bank https://core-electronics.com.au/usb-power-bank-fast-charge-30000mah.html

• Setup your Raspberry pi with the pi os https://www.raspberrypi.com/documentation/computers/getting-started.html#using-raspberry-pi-imager

• Get your pi connected to wifi https://www.raspberrypi-spy.co.uk/2017/04/manually-setting-up-pi-wifi-using-wpa_supplicant-conf/

• Wire up the servo to the gpio pins on your pi. Diagram here https://www.raspberrypi-spy.co.uk/2012/06/simple-guide-to-the-rpi-gpio-header-and-pins/)

  • Red to +5v board pin 2
  • Orange to board pin 11
  • Black to ground board pin 6

• Clone this git repo to your pi user home directory

• Download the ssh button app for your Android phone https://play.google.com/store/apps/details?id=com.pd7l.sshbutton&hl=en_AU&gl=US

  • Configure a new ssh button to run the servo.py script with each of the following commands:

     # Turn heat on to preset interval
     python3 servopi/servo.py on
    
     # Turn heat on to lower preset interval
     python3 servopi/servo.py lesswarm
    
     # Turn heat off
     python3 servopi/servo.py off
    
     # Turn heat on to higher preset interval
     python3 servopi/servo.py warmer
    
     # Move the temp up by preset interval
     python3 servopi/servo.py up
    
     # Move the temp down by preset interval
     python3 servopi/servo.py down
    
     # Set a delay in seconds before executing the command (this example can be used to set a delay for any other command as well.)
     nohup python3 servopi/servo.py off 3600 >> nohup.out 2>&1 &
    
    

• You may need to calibrate the angle of the servo for your particular thermostat and temperature preferences. Just modify the servo.py script angle variables to an angle between 0 and 180.

• Stick the apparatus to the wall with double sided mounting tape https://www.bunnings.com.au/moroday-6mm-x-10m-grey-double-sided-body-mounting-tape_p0057719?store=6037

• stick the battery holder to the wall with the same tape and put the battery in.

• Plug in your pi and enjoy!