Building a BLE Wearable SOS Trigger Prototype with XIAO nRF52840

JayQora’s current wearable is a working breadboard prototype using XIAO nRF52840 BLE, TTP223 touch sensor, vibration motor, transistor, diode, resistor, LiPo battery and slide switch. It demonstrates triple-tap touch trigger, SOS signal and confirmation buzz. A production Guardian Ring will require custom PCB, enclosure, battery optimization, haptics and certification.