Component Usage Quantity Notes
ESP32-WROOM Microcontroller with built-in AES acceleration 2 One for TX, one for RX
Laser Diode (5mW – 50mW, 650nm Red Laser) Used for transmitting data 1 Transmitter
Photodiode Module (LDR/Photodiode Receiver Module) Used for receiving data 1 Receiver
PAM8403 3W Audio Amplifier Module Amplifies audio signal 2 One per side
MAX4466 Electret Mic Captures audio input 1 Audio input
5V Relay Module Controls laser switching 1 Controls laser switching
4x4 or 4x3 Matrix Keypad For password input 2 For password input
16x2 I2C LCD Displays status 2 Displays status
LM2596 DC-DC Buck Converter (9V → 5V) Power 5V components 1 Regulates power to 5V components
AMS1117-3.3V Regulator (5V → 3.3V) Power ESP32 1 Regulates power to ESP32
9V Battery Power source 1 Power source for system
8Ω, 3W / 5W Speaker Output audio 1 Speaker for output audio
Jumper Wires (M-F, M-M) For connections 20 each For necessary connections
0 PCB Mount components 2 Used to mount components