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submitted by /u/manwax5
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Advice Needed: Choosing Nordic Nrf52840 + Bosch Bhi260ap Imu For Wearable Fall-detection Device
I'm working on a wrist-worn wearable aimed at elderly fall detection, with the following planned specs:
- MCU: Nordic nRF52840 (chosen for low-power BLE, decent processing for edge ML)
- IMU Sensor: Bosch BHI260AP (3-axis accelerometer + gyro with integrated AI capabilities)
- Battery: ~150 mAh Li-Po, target battery life is 5–7 days per charge
- Charging: Either pogo-pin or inductive coil charging (still deciding)
- Feedback: Integrated vibration motor for alert feedback
Questions:
- Is the nRF52840 + BHI260AP IMU combo appropriate for reliable, low-power fall detection and edge ML? Has anyone successfully implemented a similar combination?
- Are there common pitfalls or "gotchas" with this MCU/sensor pairing that we should anticipate upfront? (power draw, I2C/SPI quirks, sensor drift, BLE antenna design challenges)
- Any experience or advice on integrating vibration motors for feedback in ultra-low-power devices like this? (Driver ICs, best practices for minimizing battery drain, UX considerations)
Any insights or guidance greatly appreciated
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