Build this simple keypad operated switch yourself - using cheap off-the-shelf components.
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Universal Keypad Switch - Photograph

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Keypad Switch
Schematic
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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
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