Relay 1-Channel 9V Level Trigger Optocoupler Module optical fingerprint sensor It can be installed under

It can be installed under your UNO

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Relay 1-Channel 9V Level Trigger Optocoupler Module optical fingerprint sensor It can be installed underOne Channel Relay Board for 9V Control Systems The Relay 1 Channel 9V Level Trigger Optocoupler Module is a one channel relay module built for 9V class control systems that need a ready made relay output board instead of a raw relay component. It includes an optocoupler and standard NO COM NC relay terminals for easier integration. This is a useful option for control panels, industrial style logic, trigger circuits, and other builds where the