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What is your body temperature right now? What about when you were sleeping last night? While instantaneous stats are easy enough to obtain, if you’d like to graph and track them over time then the Wearable Continuous Temperature Monitor with Adafruit IO may be just the device for you.

This DIY armband uses an Adafruit Feather nRF52840 Express or an Adafruit Feather nRF52840 Sense as the computing core of the project. It passes along temperature data from an MCP9808 I2C temperature breakout to your phone via Bluetooth, then to Adafruit IO via the Internet for tracking over time. It even sends you email alerts if things get out of spec.

The wearable also features a switch, battery, and silicone cover. Besides that, other than 3D printing filament and solder there’s little else to purchase from a BOM standpoint.

The device's 3D-printed housing is especially interesting, made up of both solid and flexible materials. This allows you to make your own band to position the sensor underneath your armpit for optimal usage. Print and 3D-CAD files are available on the write-up, so you can customize things as needed. The provided code can also be modified as needed, perhaps slowing down the default refresh rate to preserve battery life.

While not explicitly outlined in the build instructions, one might note that the Feather nRF52840 Sense has various sensors built-in, such as a 9-DoF IMU and a temperature sensor. Given that, one could track lots of other stats as well, or perhaps forgo or supplement the dedicated temperature senor with the onboard device.

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