Quantity   Component name
1 × Arduino Tested with Uno and Mega
1 × HM-10 BLE module (or compatible clone) Tested with HM-10, CC41A, MLT-BT05
1 × Logic Level Converter [optional] If your module has 3.3V data lines
1 × Passive buzzer One that can be driven by an Arduino. Preferably a module with a transistor.
1 × 7-25V to 5V step-down buck converter module Preferably one that is efficient at low currents
1 × Sheet of aluminum foil For the capacitive sensor
1 × Magnetic (reed) switch [optional] Set of reed and magnet, such as ones used for doors or windows
1 × Various resistors
1 × Wires, connectors, etc