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 →
Power your 5V electronics projects with this compact AC/DC 5V 3A Wall Power Adapter. It is a handy power supply for Arduino projects, LED strips, small controllers, routers, development boards, and other 5V devices that use a 5.5mm x 2.1mm barrel jack.
This adapter supports 110VAC to 240VAC input, so it can work with common wall outlets in many regions. The output can supply up to 3A, giving your project more current headroom than lower-rated 5V adapters.
The 5.5mm x 2.1mm center-positive barrel plug is a common connector size for electronics modules and power input boards. It is a good choice when your project needs steady 5V power without using USB.
Key Specs:
- Output voltage: 5V DC
- Output current: 3A max
- Input voltage: 110VAC to 240VAC
- Frequency: 50–60Hz
- Plug size: 5.5mm x 2.1mm barrel jack
- Polarity: Center positive
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.
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 →