This smart lock uses an Arduino Nano as the microcontroller. It interfaces with a real time clock (the DS3231) to handle all scheduled events. The Nano also interfaces with a HC-05 Bluetooth module ...

1 x PCB Nano ESP32 1 x Arduino Nano ESP32 with pins 1 x 1000 µF condensator 1 x 470Ω resistor 1 x 10kΩ resistor 1 x diode 1N5817 1 x 2-pin female connector (LDR) 1 x 5-pin female connector (Rotary) 1 ...