1 Way 5V Relay Module is a relay board that you can control it's contacts with 5V via Aruino or another microcontroller board.
It draws 20mA of current from microcontroller when triggering. It is used frequently in hobby, industrial and robotic projects.
It can relay current up to 10A at 30VDC or 220VAC. The board has control LEDs for each relays.
Relays are triggered with logic 0 (0V).
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