Open source wearable watch (including firmware, schematics and 3D printing diagrams)

Open-Watch is an open source smartwatch project developed by B.Sc. This smartwatch can measure linear acceleration, rotational speed, heart rate, and SpO2 (oxygen saturation) of the hand. All this data will be processed by the STM32 processor with ARM Cortex-M core.
MPU6050 is used for IMU purpose, using Kalman filter to reduce noise effects and extract clean data from sensors (3-axis linear acceleration, 3-axis rotation speed and 3-axis rotation angle).
The MAX30102 is a sensor for healthcare purposes that simply reads raw data and moves the process to a smartphone.
Open-watch will send this collected data to a smartphone via a Bluetooth module. On the smartphone side, the Android app reads the data from Bluetooth and processes it. For healthcare applications such as heart rate and SpO2 analysis, ML-based algorithms are used to extract these parameters from the raw data read by the pulse oximeter sensor.