What it is
The ShillehTek 4-Channel 12V Relay Module Board for Arduino & Raspberry Pi lets your microcontroller toggle up to four loads independently using simple GPIO trigger signals, while powering the relay side from a 12V supply—ideal for automation builds and control boxes that already run on 12V.
Pins
Refer to the silkscreen labels on the relay module board and the listing photos for the exact pin names and terminal functions. In general, boards like this provide a 12V power input for the relay side, multiple logic trigger inputs (one per channel) for Arduino/Raspberry Pi control, and screw terminals for the switched load connections per relay.
Technical Specifications
| Spec | Value |
|---|---|
| Channels | 4 |
| Relay supply (relay side) | 12V (as described) |
| Control platform compatibility | Arduino, Raspberry Pi (GPIO trigger control) |
| Switched terminal type | See listing photos |
| Pinout / input labeling | See listing photos; refer to board silkscreen |
| Load ratings | Varies by module revision |
Frequently Asked Questions
How do I wire a 4-channel 12V relay module to an Arduino?
Power the relay side from a 12V supply, then connect the module’s trigger inputs to Arduino GPIO pins (one per channel). Use the screw terminals on each relay to route power to your load like an on/off switch; follow the board silkscreen and listing photos for exact labels.
Can a Raspberry Pi control this 12V relay board?
Yes—this module is intended to be toggled by simple GPIO trigger signals while the relay side is powered from 12V. Always verify the input labeling on your specific board revision and use the silkscreen pinout as your reference.
What can I switch with a 4-channel relay module?
Each channel functions like an electrically controlled on/off switch, so you can control loads such as lights, fans, pumps, and valves from your Arduino or Raspberry Pi code. Ensure your load stays within the relay ratings for your specific module revision.
Where can I find the pinout and wiring diagram for this relay module?
Use the silkscreen labels printed on the PCB and the product listing photos for the most accurate pinout and terminal identification. Revisions can differ, so avoid relying on a generic relay-module datasheet unless it matches your board.