ATMEGA328 MCU + 16MHz Crystal + 22pF Capacitors + IC Socket Kit – Support Documentation
This kit includes all the core components required to build a standalone microcontroller system using the ATmega328P. It’s ideal for breadboarding Arduino-compatible circuits or embedding microcontroller logic into custom projects. The kit includes a DIP ATmega328 microcontroller (can be pre-bootloaded with Arduino firmware), a 16MHz crystal oscillator, two 22pF ceramic capacitors, and a 28-pin DIP IC socket for secure mounting.
Kit Contents
- 1 x ATmega328P-PU Microcontroller (DIP-28)
- 1 x 16MHz Crystal Oscillator
- 2 x 22pF Ceramic Capacitors
- 1 x 28-Pin DIP IC Socket
Component Details
ATmega328P Microcontroller
- Architecture: 8-bit AVR RISC
- Flash Memory: 32KB (0.5KB used by bootloader)
- SRAM: 2KB
- EEPROM: 1KB
- I/O Pins: 23
- Operating Voltage: 1.8V – 5.5V
- Clock Speed: 16MHz (via external crystal)
- ADC: 6-channel, 10-bit
16MHz Crystal Oscillator
- Frequency: 16MHz
- Package: HC-49/U
- Used to set the ATmega328 clock source
22pF Ceramic Capacitors
- Capacitance: 22pF ±5%
- Used for stable crystal oscillation
IC Socket
- Pin Count: 28
- Type: Dual in-line (DIP)
- Purpose: Allows easy removal/replacement of ATmega328
| Pin | Label | Function |
|---|---|---|
| 1 | PC6 | RESET |
| 2 | PD0 | RXD (Serial Receive) |
| 3 | PD1 | TXD (Serial Transmit) |
| 4 | PD2 | INT0 |
| 5 | PD3 | INT1 |
| 6 | PD4 | XCK/T0 |
| 7 | VCC | +5V Power |
| 8 | GND | Ground |
| 9 | PB6 | XTAL1 (Crystal Input) |
| 10 | PB7 | XTAL2 (Crystal Output) |
| 11 | PD5 | T1 |
| 12 | PD6 | AIN0 |
| 13 | PD7 | AIN1 |
| 14 | PB0 | ICP1 |
| 15 | PB1 | OC1A |
| 16 | PB2 | SS/OC1B |
| 17 | PB3 | MOSI |
| 18 | PB4 | MISO |
| 19 | PB5 | SCK |
| 20 | AVCC | Analog +5V Power |
| 21 | AREF | Analog Reference |
| 22 | GND | Ground |
| 23 | PC0 | ADC0 |
| 24 | PC1 | ADC1 |
| 25 | PC2 | ADC2 |
| 26 | PC3 | ADC3 |
| 27 | PC4 | ADC4/SDA |
| 28 | PC5 | ADC5/SCL |
Assembly Instructions
- Insert the IC socket into your breadboard or PCB.
- Place the ATmega328P into the socket, aligning the notch.
- Insert the 16MHz crystal across pins 9 and 10.
- Connect one 22pF capacitor between pin 9 and GND, and the other between pin 10 and GND.
- Add a 10kΩ pull-up resistor between pin 1 (RESET) and VCC.
- Connect VCC (pins 7 and 20) to 5V, and GND (pins 8 and 22) to ground.
Programming
If your chip is bootloaded with the Arduino UNO firmware, you can use an FTDI USB-to-Serial adapter for programming. Connect:
- DTR → 0.1µF capacitor → RESET
- TX → RX (pin 2)
- RX → TX (pin 3)
- VCC → 5V
- GND → GND
Troubleshooting
- Sketch won’t upload: Check FTDI connections and ensure correct board and port are selected.
- No clock detected: Recheck 16MHz crystal and capacitor values; verify secure connections.
- No response from MCU: Confirm chip orientation and power supply levels.
Applications
- DIY Arduino-compatible boards
- Standalone microcontroller circuits
- Embedded systems
- Educational development platforms