Arduino Thermostat Projects

Control heating and cooling with these Arduino projects

Young woman changing heating
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Home heating, ventilation and air conditioning (HVAC) systems have typically been a household technology that has not been accessible to the common homeowner. The equipment for managing these systems has been the domain of only a few companies, and in the past, thermostats have not been easy to use or control.

But new technologies have made this area of home ownership more transparent to the average consumer, and the popularity of technologies like the Nest learning thermostat has demonstrated that there is demand for better interfaces, and greater control over these aspects of the home.

Some tech enthusiasts have taken this desire for control one step further, and and are experimenting with Arduino to develop their own custom hardware for controlling the temperature in the home and in other areas of home life. Check out these Arduino based thermostat project for some ideas of how Arduino can be used in to create your very own custom thermostat.

  • Simple DIY Thermostat Project: The project above is one of the simpler Arduino based thermostat solutions that would be appropriate for a beginner. It uses a Dallas DS18B20 one wire temperature sensor to provide the current temperature, and a simple LED and LCD combo to indicate temperatures and the thermostat status. A relay shield provides the outputs that will interface with the home HVAC system. If you are not looking to add any network features or sophisticated functionality to your Arduino thermostat, this project provides an idea of the basic layout of a thermostat project.
  • Network Enabled Thermostat: For a more complex look at the possibilities of an Arduino based thermostat, the user in the project above has created a number of versions of an ethernet capable thermostat for interfacing with HVAC systems. Over time, this project has become increasingly complex, with additional features like a complex multicolor display and temperature and humidity sensor. Check out the series of articles for an example of a more complicated thermostat, and see how the project evolved over time.
  • Arduino Fridge Controller: Home HVAC systems aren't the only areas in which a thermostat is required. Refrigerators are also typically controlled using a thermostat, and if your refrigerator is causing problems due to a faulty thermostat, then this Arduino project might provide the answer. This project uses the same Dallas temperature sensor seen in the simple thermostat project to provide control for the compressor on the refrigerator. The project starts simply, and later updates provide the addition of an ethernet shield for logging the temperature and compressor state. Check out the full series of blog posts to see this project evolve.
  • Arduino Web-Based Thermometer: Perhaps you aren't looking to replace an entire thermostat system with a home-brewed Arduino solution, you simply would like to create a thermometer that is accessible via the web. This could be useful for a number of different applications, both around the home, and potentially to monitor work environments like server rooms. The project above is a simple solution for creating a web-accessible thermometer, and the accompanying code uses a simple website and mobile app to create a messaging interface between the user and the thermometer device.

    These projects should provide an idea of how Arduino can be a great gateway to making what was once an inaccessible aspect of home control and technology available to the everyday tinkerer. Arduino has a great deal of potential as a way to open up programming possibilities for everyday objects. If you are interested in other options for Arduino development, you can check out other possibilities like Arduino motion sensor projects or Arduino lock devices.