There are plenty of fancy smartwatches that can track your health and fitness activity. If you are looking for an open hardware version, the HealthyPi Move is worth a look. It is a vital signs monitoring and recording device. It can measure ECG, PPG, SPO2, blood pressure, HRV, and a lot more. It is powered by the Nordic nRF5340 dual-core SoC with Bluetooth.
More gadgets like this: here
HealthyPi Move has a 1.28-inch capacitive touch display. It also comes with a 6DOF IMU. It has a mobile app that works on Android. Here is the neat part: all the hardware design files, firmware, and software are all open source.
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