dianlight / SmartTemp

DIY Smart Thermostat

Smart Temp

An DIY Smart Thermostat
Changelog · SmartTemp Bug · Request Feature

Table of Contents

• Table of Contents
• About The Project
  • Built With
• Getting Started
  • Hardware Prerequisites
  • Circuit
  • Environment Prerequisites
  • Installation
• Config.h options
• Features / Whishlist
• Roadmap
• User Manual
  • Encoder function
  • Thermal confort mode (Advanced)
  • PMV/PPD method
  • Modes
  • In house / away selection
• Contributing
• License
• Contact
• Acknowledgements

About The Project

Just another smart thermostat!

In a smart home, a smart thermostat cannot be missing. So why not build one at low cost and with all the features that interest me.

The project started using material left over from other projects and respecting the following requirements:

• Low cost
• Independence from Cloud services (privacy first!)
• Small size (must be contained in a US size box)
• Be smart but if necessary work without WiFi and / or external controller
• KISS. Being able to be used by my wife, daughter, son, mother, father, grandmother, grandfather -> the whole family!

Built With

• Platform IO

Getting Started

To get a local copy up and running follow these simple steps.

Hardware Prerequisites

For a detailed list of components refer to the documentation (BOM)

1. I2C Advance Extender based on ATMEGA8A-PU (See project at8i2cgateway)
2. MCU ESP-01 or ESP-01S
3. Serial programmer
4. I2C Oled display
5. Rotary encoder
6. DHT22 sensor
7. Relay
8. 5v power source ( I used an Hi-Link 220v to 5v but you can use alse batteries )
9. Wires and Connectors

Circuit

!Work in progress!

Environment Prerequisites

1. Platform IO ( to compile and generate the firmware )
2. An HomeAssistant installation ( used as Smart Controller ) (Optional)
3. An MQTT Borker (Optional)
4. An WiFi capable device like SmartPhone.
5. An WiFi internet connection

Installation

1. Burn the bootloader into the ATMEGA8 with Arduino IDE and the SPI/ASP programmer
2. Clone the SmartTemp

git clone https://github.com/dianlight/SmartTemp.git

3. Open the project with Platform IO
4. Configure the firmware src/include/Config.h
5. Build and flash your firmware

Config.h options

!Work in progress!

Features / Whishlist

• Standalone Thermostat
  • Current Room Temperature
  • Current Room Humidity
  • 3 levels of temperatures. (ECO, NORMAL and CONFORT)
  • Week programming (15min resolution)
• Supported units
  • Celsius mode
  • Fahrenheit mode ( Wikipedia )
• Advanced Thermostat
  • Away/In_house temp control
  • Auto, Manual and Off mode
  • Thermal confort mode
    • PMV/PPD method
    • Adaptive comfort model¹
    • ASHRAE-55²
    • EN-16798²
• Smart Thermostat (Wifi remote controlled)
  • MQTT transport
  • HomeAssistant climate compatibility (via MQTT integration)
    • Homeassistant room presence integration ( auto AWAY/NORMAL mode )
  • NTP clock sync (daylight auto switch)
    • Time Zone configuration
• WebInterface
  • Mobile WebApp
• External sensor
  • Wifi temperature sensor
  • Wifi pressure sensor
  • Wifi air speed sensor
  • Home Assistant collector
• Enclosure (3D STL printable models)
  • Italian BTicino Living 2Gang
  • EU standard
  • UK standard
  • US standard

*Checked are implemented

¹Require external temperature sensor

²Require external temperature, pressure sensor and internet connection

Roadmap

See the open issues for a list of proposed features (and known issues).

User Manual

Encoder function

!Work in progress!

Thermal confort mode (Advanced)

!Work in progress not yet implemented!

The thermal confort mode allows you to set the thermostat not based on the real desired temperature but on the basis of the confort temperature. This significantly increases comfort by reducing consumption.

PMV/PPD method

Modes

Mode	Description	Home modfity	Away modify	Note
Auto	Follow the Week program to set Eco, Normal or Confort target temp	none	± delta
Manual	Follow the setting of selected target temp	none	± delta	return to Auto mode after impoisted time

In house / away selection

Selection	Mode	Description	Function	Note
In house	Auto	Standard mode	Follow week program
In house	Manual	Temporary mode	Follow selected target temperature until timeout expire	Automatic return to Auto mode
Away	Auto	Advanced mode	Follow week program with a ± temperature delta
Away	Eco	Advanced mode	Lock to Eco target temperature with a ± delta	No automatic return to Auto mode
Away	Normal	Advanced mode	Lock to Normal target temperature with a ± delta	No automatic return to Auto mode
Away	Confort	Advanced mode	Lock to Confort target temperature with a ± delta	No automatic return to Auto mode

Contributing

Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are greatly appreciated.

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
3. Commit your Changes (git commit -m 'Add some AmazingFeature')
4. Push to the Branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

License

Distributed under the GPL3 License. See LICENSE for more information.

Contact

Project Link: https://github.com/dianlight/SmartTemp

Acknowledgements

Icons made by Pixel perfect from www.flaticon.com