There are plenty of sensors that can capture your motion and biosignals and make it available in your favorite apps. Many of them are not open source, though. The VitalTrack PPG&Motion is a research grade biosignal and motion tracker that can be used in various wearable form factors. It has a SDK, so you can develop custom applications for it. This gadget gives you access to raw PPG and motion data, enabling you to develop custom algorithms for it.
This gadget has a 3-axis accelerometer, gyroscope, and magnetometer. It has a Bluetooth module built-in and supports USB-C charging. It has a low power design, so you can use it for custom wearables. According to the project page, the SDK software will be available for iOS, Android, Windows, and Linux devices.
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