USB Control Module 1-Channel 5V Relay Module (No Driver Needed)
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$6.99
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Black
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A single relay you control from a computer over USB. The CH340 bridge presents a virtual COM port (driver-free on Linux and Raspberry Pi), and a short command at 9600 baud 8N1 switches the SPDT relay — 10 A at 250 V AC or 30 V DC on NO, COM and NC screw terminals. It draws about 70 mA from the USB port, so no external supply is needed. Op