DFRobot Gravity Digital MOSFET Power Switch Module

A microcontroller's GPIO pin can source only a few milliamps - nowhere near enough to drive a motor, pump, or high-power LED array directly - and a relay's mechanical switching introduces click noise, wear, and a slower response time than solid-state switching offers. This module solves both problems: a MOSFET does the actual switching entirely electronically, handling up to 20A of load current (with an external heatsink recommended above 10A) while needing only a 3.3-10V logic signal to turn on.

Because it's a MOSFET switch rather than a relay, switching happens in microseconds (20µs on, 50µs off) rather than the milliseconds a mechanical relay needs, and there's no mechanical wear to eventually fail from repeated cycling. The wide 5-36V VIN range covers most common DC power rails used in robotics and automation, and the PH2.0-3P connector keeps wiring simple and keyed against reversed connections.

Common uses are switching high-current DC motors, pumps, or LED arrays directly from a microcontroller pin, PWM-based dimming or speed control of DC loads at higher currents than a transistor circuit would handle, and any project needing fast, silent, wear-free switching in place of a mechanical relay.