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 →
Choose the Right 5V Relay Board Size for Your Project
The Relay Module Channel 5v With Optocoupler Projects Arduino Compatible listing groups several 5V relay board sizes into one product, so you can choose the channel count that matches your build. It is a smart option for makers who want the same relay style across small and large projects.
From a single output to multi-output control panels, this family gives you a familiar 5V relay format with optocoupler protection and Arduino-friendly control.
Important: Pick the channel count based on how many independent outputs you need now and how much room you want for future expansion.
Why you'll like it
- Several channel options: 1, 2, 4, 6, 8, and 16 channels
- 5V control: Common for maker boards and automation demos
- Optocoupler support: Better protection between logic and relay side
- Consistent board family: Easier to standardize across projects
- Strong all-around use: Good for lights, locks, valves, pumps, and more
What you can build
Use the 1- or 2-channel versions for simple builds, the 4- to 8-channel versions for common automation jobs, and the 16-channel version for denser control panels or larger demonstration systems.
Starter bundles
Pair it with an Arduino-compatible board, ESP32, or Raspberry Pi, plus jumper wires, a suitable power supply, and a small load for bench testing.
Recommended add-ons
Useful add-ons include terminal block, breadboard, power modules, fuses, and enclosure, especially when you are working with higher voltages or inductive loads.
Technical specifications
| Product | Relay Module Channel 5v With Optocoupler Projects Arduino Compatible |
|---|---|
| Control voltage | 5V DC |
| Switching capacity | 10A @ 250VAC / 10A @ 30VDC |
| Board family | Optocoupler relay modules |
| Available variants | 1, 2, 4, 6, 8, 16 channels |
| Typical use | Arduino, ESP32, Raspberry Pi, and automation projects |
Relay board size comparison
| Variant | Control voltage | Switching capacity | Best fit |
|---|---|---|---|
| 1 Channel | 5V | 10A @ 250VAC / 10A @ 30VDC | One output |
| 2 Channel | 5V | 10A per relay | Two outputs |
| 4 Channel | 5V | 10A per relay | Common robot or automation builds |
| 6 Channel | 5V | 10A per relay | Mid-size control panels |
| 8 Channel | 5V | 10A per relay | Large multi-output projects |
| 16 Channel | 5V | 10A per relay | Dense automation racks and demos |
Pinout & power notes
Most versions use VCC, GND, and one IN pin per relay, with COM, NO, and NC on the output side. Some board revisions also include JD-VCC jumpers for separate relay power setups.
What’s in the box
1 × selected relay module variant
Frequently Asked Questions
Which version should I choose?
Choose the smallest version that meets your output count today, or size up when you want room to expand.
Choose the smallest version that meets your output count today, or size up when you want room to expand.
Can I use the same code style across variants?
Usually yes. The main difference is how many input pins you control.
Usually yes. The main difference is how many input pins you control.
Why use a 16-channel board?
It keeps large multi-output builds much cleaner than stacking many smaller boards.
It keeps large multi-output builds much cleaner than stacking many smaller boards.
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 →