Smart Thermostat for Android devices.

Build your own (and cheap) Smart Thermostat
for your home heating
and start saving money now!

The project explained briefly

Smart Old Relic Thermostat

If you have an old smartphone or tablet forgotten in a drawer, a box or a dark corner, you can recycle it and use build a Smart Thermostat! The main actor of this project is the Smart Old Relic Thermostat Android App. It is designed to control a home heating system, and works with devices as old as Android 4.0. The app is available in the Play Store.

The temperature sensor

The second piece of this project is the temperature / humidity sensor. We are working to support different temperature sensors, but at this moment you will need an ESP32 microcontroller, and a DHT temperature sensor. The sensor will read the temperature and humidity of your home / room, and serve this information to the Old Relic App. Of course, you can have multiple temperature sensors if you want (for example, one for each room of your house).

A DHT11 Temperature and humidity sensor connected to an ESP32 microcontroller .

The relay

Of course, you will need something to turn on and off your home heating system (for example, your boiler). For that you will need an ESP32 microcontroller and a High Level Triggered relay will do the work! All this components are very cheap, and easy to configure.

Two Channel High Level Relay connected to an ESP32 board

The Client app

Of course, you can control your Smart Thermostat with your smartphone with the Client companion app "Smart Thermostat Client".

You can install this app in as many devices as you want, for example, for you and your family.

Smart Pi Thermostat

We also are preparing a version of the smart thermostat that will work on a Raspberry Pi 3b, with the new OS from Google, Android Things. If you don’t have an old Android smartphone or tablet, even so you can build your Smart Thermostat using a Raspberry Pi 3B.

The advantage of the Raspberry Pi is that you can connect a temperature sensor and a relay directly to the Pi, if you don’t want to rely on wireless sensors.

Optionally you can have a touch screen for the Pi, and control the thermostat in the same way as you do it in a smartphone, but it is not indispensable. In the following video you can see the Smart Thermostat working on a Pi 3B.

Do you want to test the Smart Pi Thermostat beta version?

The app for the Raspberry Pi is in a beta phase now and we have to wait until the Android Things is officially released. If you are interested in this version. please subscribe to our newsletter and we will notify you as soon as the app is available.