1 Channel 5V Relay Module (High/Low Level Trigger)

A single-relay board covers the most common automation task of letting a microcontroller switch one mains-powered or high-current load, such as a lamp, fan, or pump, on and off. What sets this module apart from the most basic single-relay boards is its selectable trigger level: a jumper lets it respond to either a high signal or a low signal from the control pin, which matters when a project's existing code already assumes one logic convention and rewriting that logic would be more work than flipping a jumper. The relay's screw terminals accept real wiring without a soldering iron, and the board's small footprint makes it easy to tuck beside a controller board inside an enclosure for a finished smart-switch or automated-appliance build.