Build this simple keypad operated switch yourself - using cheap off-the-shelf components.

COMMENTS SUGGESTIONS	Universal Keypad Switch - Photograph	MORE KEYPAD CIRCUITS

Keypad Switch Schematic	The Rest of Ron's Circuits	Write To Ron	More Free-to-Use Circuits	Circuit Exchange International

Circuit Board

This is a photograph of the Universal Keypad Operated Switch. Pressing a single key energizes the relay. Entering a four-digit code of your choice de-energizes the relay. I used an SPCO/SPDT relay in the prototype - but you can use a multi-pole relay if it suits your application.

A Photograph Of Ron J's Universal
Keypad Controlled Switch - Circuit Board

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Keypad Switch Schematic	The Rest of Ron's Circuits	Write To Ron	More Free-to-Use Circuits	Circuit Exchange International

Universal Keypad Switch - Photograph

Circuit Board