Fingerprint Sensor AS608 - A Beginner's Guide
One touch can replace keys. This project uses an optical fingerprint sensor to enroll users and then grant access with a quick scan.
read tutorial →
Adafruit METRO 328 without Headers - ATmega328 is an official Adafruit product available from Circuitrocks, an official distributor of Adafruit. An Arduino Uno-style development board built around the ATmega328, ideal for prototyping and teaching.
Why choose this Adafruit board or module?
- Familiar ATmega328 development platform
- Compatible with many Arduino-style shields and workflows
- Good for education, prototyping, and general embedded use
What you can build
Arduino-compatible prototypes, Classroom builds, Sensor and control projects.
Technical description
Adafruit METRO 328 without Headers - ATmega328 is designed for makers, engineers, and educators who need a genuine Adafruit part with dependable documentation, known compatibility, and easy access to official support material. It is a practical choice for prototyping, testing, and repeatable electronics builds.
Technical specifications
| MCU | ATmega328 |
|---|---|
| Clock | 16 MHz |
| Logic level | 5V |
| I/O | 20 digital I/O, 6 analog inputs typical METRO/UNO class |
| Form factor | Arduino-compatible |
| USB | Onboard USB-serial support |
Pinout & power notes
Sold without headers for cleaner custom assembly or low-profile installs.
What’s in the box
Board only, no headers.
Official resources
Manufacturer product page: https://www.adafruit.com/product/2466
Guide / tutorial: https://learn.adafruit.com/adafruit-metro-328
Datasheet / downloads / documentation: https://learn.adafruit.com/adafruit-metro-328
Q: Is this compatible with Arduino Uno-style shields?
A: It is designed as an Arduino-compatible METRO/UNO-class board.
Need this for a student build, prototype, or production-ready electronics project? Circuitrocks helps makers, schools, and developers source genuine Adafruit products with access to official documentation and manufacturer references.
Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.
Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.
Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
Compatibility & downloads
// downloads
- GitHub PCB repo git
- GitHub PCB repo git
Customers also bought
Build with this board
Thumb Joystick - A Beginner's Guide
Wire a joystick to your Arduino, read X/Y, then print UP / DOWN / LEFT / RIGHT to the serial monitor.
read tutorial →Motor Drive (BTS7960 43A) - A Beginner's Guide
Bench-test a 43 A motor driver before wiring the full project. Catches weak power, mis-pinning, and dead boards before they cost you time.
read tutorial →Raspberry Pi Pico (RP2040) - A Beginner's Guide
Coming from UNO and the Pico won't show a COM port? Here's the BOOTSEL trick, the driver fix, and the first sketch that actually works.
read tutorial →Notes from the bench
Ask the community
Project Showcase — show what you built
Share what you built. Photos, BOM, what worked, what didn't.
view thread →How to ask a good question (and actually get answers)
Symptom + what you tried + clear photo = answers within hours.
view thread →ESP32 brownout when wiring a sensor — fixes that worked
Brownout reset when adding a sensor? Notes on supply decoupling and GPIO checks.
view thread →First Arduino — sketch upload error, what to try?
Upload failing on your first Uno? Driver, COM port, board match — checklist inside.
view thread →