ESP32 Fingerprint based Biometric Door Lock & Home Automation 

Nice Video.. easy to understand

I just want to ask if there is a video that uses the MQ3 sensor to determine how much alcohol the target user has consumed.

how to make emergency scenario if blackout and internet connection not avalalaible for 3 hour for example. specially for door lock ,no internet mean you cannot open your door for 3 hour.any idea to solve this problem.thanks

is Safe esp32 using DC 12 volt? because according to datasheet only 3.3 volt - 6 Volt, best for esp32,thanks.

where wiring to doorlock,only wiring to lamp and finger,how to wiring to doorlock,thanks