To be able to realize our build, we need the following components:
- A breadboard
- A Raspberry Pi, of course
- A Raspberry Pi 3 T-Cobbler or male to female jumper wires
- Breadboard wires
- Three 10 Kohm resistors
- A Hitachi HD44780 16x2 character display
- One 10 Kohm potentiometer
- One 4.7 Kohm resistor
- A 1 µF capacitor
- A LDR a.k.a. LDR
- One BC546B NPN transistor
- One 5V switchable mechanical relay, such as a Keyes 5V relay module or similar
- One 1N4148 diode
- A device capable of being detected by Bluetooth, such as a mobile phone
