To flash the firmware to the DIY-Thermocam, use the Teensy Loader that works under Windows, Linux and Mac OSX.

First get the newest version of the firmware from here and extract the .hex file from the zip archive to your computer.

For Windows, the two executables are available in this folder. Load the hex file with "teensy.exe", then launch "teensy_reboot.exe" while the Thermocam is connected to the PC and turned it on. The flash procedure should start.

For Linux and Mac OSX download "Teensyduino" from here and flash the firmware in a similar way than for Windows.

In the unlikely case that the update failed and the device does not start any more, press the push button on the Teensy to put it into bootloader mode, then try to flash again.


You need to setup the development IDE if you want to make your own changes to the open-source firmware of the DIY-Thermocam. This guide should work under all operating systems.

Download and install the following programs:

  1. VS Code
  2. PlatformIO Core
  3. PlatformIO for VS Code

Then clone this repo: git clone https://github.com/maxritter/DIY-Thermocam/tree/master/Firmware_V3.

The Teensyduino version that comes pre-installed with PlatformIO does not support Mass Storage Mode (MTP), so we need to update it. Extract the content of other/platformio_teensy4.zip to: C:\Users\<YOUR_ACCOUNT>\.platformio (filepath on Windows or Mac is different, I am using Windows) and overwrite any existing files.

Now start VS Code and open the folder that you have just cloned with File -> Open Folder.

PlatformIO should initialize itself automatically and you see the buttons to Build, Upload and Clean the project in the blue bar at the bottom.

Before you click "Upload", make sure the Thermocam is connected to the PC via a micro USB cable and turned on. The Teensy CLI should then automatically detect it and flash the .hex file to the board. After a restart the changes should be present on the device.