A Python Raspberry Pi thermostat for an analog air conditioner.
This is a very basic IOT setup - the script turns a relay on or off (or leaves it on/off) based on temperature thresholds. Do with it what you will, I plugged an air conditioner into it.
Super big thanks to the folks at Adafruit for their great temperature sensing guide - https://cdn-learn.adafruit.com/downloads/pdf/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing.pdf
- Raspberry Pi - I used a Pi Zero W
- DS18B20 Temperature sensor w/ 4.7k resistor - https://www.adafruit.com/product/381
- Controllable relay - I used https://dlidirect.com/products/iot-power-relay
- Breadboard and associated hardware (breakout kit)
- 5 male-to-male jumper cables
To set up the temperature sensor, follow the instructions at https://cdn-learn.adafruit.com/downloads/pdf/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing.pdf to wire up the breadboard and add OneWire support to your Pi.
Connect the relay's negative terminal with a male-to-male jumper to any ground pin - I used pin 6. Then connect the positive terminal with a male-to-male jumper to GPIO pin number 16.
Start the app with
python 3 main.pyTo allow this app to run perpetually in headless mode, I installed GNU Screen - https://www.gnu.org/software/screen/ on my Pi.
I'd like to provide a simple user interface that would allow a person to manually turn the relay on/off and set different temperature ranges, etc.
I'm also planning to rebuild this app using Elixir Nerves.