Hardware Setup Guide

Required Components

• ATmega168 microcontroller (DIP-28)
• 16 MHz crystal (optional, can use internal 8MHz)
• 2 × 22pF capacitors (for crystal)
• Piezo buzzer (5V)
• 220Ω resistor (for buzzer)
• USB-to-serial adapter (FTDI, CP2102, CH340)
• 5V power supply
• Breadboard and jumper wires

Wiring Diagram

* ATmega168          USB-to-Serial
* ┌─────────┐        ┌──────────┐
* │PD0 (2)  ├────────┤RX        │
* │PD1 (3)  ├────────┤TX        │
* │PD5 (11) ├────┬───┤          │
* │         │   220Ω│          │
* │         │    ┌─┴─┐          │
* │GND (8)  ├────┴───┴──────────┤GND
* │VCC (7)  ├────────┤VCC (5V)  │
* └─────────┘        └──────────┘
*            Buzzer
* 

Pin Configuration

Edit src/includes/pinDefines.h to change buzzer pin:

#define BUZZER_DDR   DDRD
#define BUZZER_PORT  PORTD
#define BUZZER_PIN   PD5    // Change to any PD pin

Power Requirements

• Voltage: 5V DC
• Current (idle): ~15mA
• Current (playing): ~25-35mA
• Can be powered via USB-to-serial adapter