2 ms·
An arduino BLE, 18650 battery will probably run you about 50 bucks (retail, one-off). From experience, that will run for at least 4+ years in low-power mode --
by withinboredom 3y ago
An arduino BLE, 18650 battery will probably run you about 50 bucks (retail, one-off). From experience, that will run for at least 4+ years in low-power mode -- maybe even decades. Announce a BLE service with the alarm status.