Architecture

Smart Thermostat pretends to be flexible enough to adapt itself to the most used configurations and budgets.

Arquitectura para Smart Old Relic Thermostat
In this setup, the thermostat will read info from three temperature sensors (connected to three esp32’s), and will control the boiler with a relay connected to an esp32.

The Thermostat app

All you need is an old smartphone or tablet with Android 4.1+. Our Android app installed on this device will the play the “Thermostat” role.

The main thing to take in account is that you can’t connect sensors directly to a smartphone or tablet, and all the sensors will be wireless sensors, controlled by ESP32 mcu’s. The android device will communicate with the ESP32 mcu’s, and play the role as thermostat.

The nodes.

For each node we use one ESP32 mcu. A node can be

  • a temperature/humidity node: the role of this node is to register the temperatures in a room and report them to the thermostat. For this type of nodes you will need one ESP32, and one temperature sensor. You can have as many temperature nodes as you want.
  • a relay node: the role of this node is to turn your boiler on and off. There may be only one relay node per thermostat. You will need an ESP32, and a High Level Triggered relay.
  • an hybrid node: you can have both, the relay and the temperature sensor connected to the same ESP32, which will assume both roles: report the temperatures and turn the boiler off and on. Important is the fact that you can have only one relay per thermostat.

The Client App

The Client App will be the most common way to control the thermostat, specially when you are not at home. Many users can share the access to the same thermostat (for example, the members of a family).