My super-cheap fitness tracker has a hidden feature that can go head-to-head with Garmin and Apple

My Amazfit Helio Strap is a treasure trove of features. I can't believe this $99 fitness tracker beats the Apple Watch 11.
IEEE

Nanoresonator-based accelerometer with large bandwidth and improved bias stability

Abstract: Resonant-beam accelerometers based on nanoresonators have demonstrated that reducing the size of the sensing element allows overcoming the sensitivity-bandwidth trade-off [1]. Here we report ...
IEEE

Characterization of MEMS accelerometer self-noise by means of PSD and Allan Variance analysis

Abstract: In this paper, we have studied the sources of error of a low-cost 3-axis MEMS accelerometer by means of Power Spectral Density and Allan Variance techniques ...