Atrium — tiny nRF52832 optical wearable pod
GitHub
A 20.9 × 11 × 5.3 mm temple-worn pod for pulse, HRV, sleep and skin temperature, with Bluetooth LE sync to a phone app. · The electronics are split into a radio island (nRF52832,…
Insights: It shows how to fit a BLE wearable into a tiny volume using HDI stack-ups, rigid islands and a flex jumper. · It demonstrates good RF layout practice for a chip antenna on a very…
wearablenRF52832HDI flex