Direct connecting 5v relay interface board to usb - Electrical Engineering Stack Exchange
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Results page 24, about 'Usb Relay'. Searching circuits at Next.gr
1 Channel USB Powered Relay Module | Numato Lab Help Center
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12V 4 Channel USB Relay Module Programmable Computer Control Switch for Smart Home PC Intelligent Control: Amazon.com: Industrial & Scientific
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Can I drive a two relay module directly from Arduino - #33 by lastchancename - Project Guidance - Arduino Forum
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