But just how small can they go? With current components, [Femtoduino] think they’ve cracked it, delivering an ESP32-based board with WiFi and Bluetooth, and an LDO regulator for 5 V operation in ...

The ability to set up a hub and detect Bluetooth devices solves the problem Bluetooth beacons solves — identifying when people enter a space, leave a space, and with a little bit of logic where ...