Actuator
1-channel relay module (5 V)
Lets your microcontroller switch pumps, fans and lamps it could never drive directly.
Pinout
- VCCpower (5 V)
- INdigital
- GNDground
Bench notes
Most cheap modules are active-LOW — if yours clicks backwards, swap HIGH/LOW in the code.
- Typical price
- $1.20
- Libraries
- none needed
- Prompt keywords
- relay, pump, appliance, switch