What it is
The ShillehTek Arduino Relay Module 2-Channel 12V Raspberry Pi Relay Board lets an Arduino or Raspberry Pi control two devices independently while powering the relays from a 12V supply. Each channel acts like an electronically controlled on/off switch, making it useful for small control panels and automation builds (lights, pumps, fans, valves, or solenoids) where you want clean switching from GPIO trigger signals.
Pins
Pin names and terminal labels can vary by module revision. Refer to the silkscreen labels on the relay board and the listing photos for the exact pinout (power input, channel trigger inputs, and relay output terminals per channel) before wiring to Arduino or Raspberry Pi GPIO.
Technical Specifications
| Item | Value |
|---|---|
| Module type | 2-channel relay module (Arduino / Raspberry Pi compatible) |
| Relay supply | 12V (as described) |
| Number of controlled loads | 2 (independent channels) |
| Control interface | GPIO trigger signals (see listing photos / board labels) |
| Pinout / terminal labeling | Varies by module revision |
Frequently Asked Questions
How do I wire a 2-channel 12V relay module to an Arduino or Raspberry Pi?
Power the relay board from a 12V supply, then connect your Arduino/Raspberry Pi GPIO lines to the channel trigger inputs shown on the board silkscreen. Finally, wire each load through the relay output terminals for its channel (follow the terminal labels on your specific board).
Can this relay board switch two devices independently?
Yes. It is a 2-channel relay module, so your code can toggle each relay separately to control two different loads like lights, pumps, fans, valves, or solenoids.
Does the relay module need 12V power even if my GPIO is 3.3V or 5V?
The relays are described as being powered from a 12V supply. Your GPIO provides the trigger signal, but the board still needs the 12V relay supply; verify the exact input labeling and wiring on the module silkscreen and listing photos.
What projects is a 2-channel Arduino/Raspberry Pi relay module good for?
It’s commonly used in small automation and control-panel builds where you want reliable on/off switching from code—such as controlling lights, pumps, fans, valves, or solenoids—especially when you already have 12V available.