All the information you need to build a simple keypad code-operated switch - using cheap off-the-shelf components.
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Keypad Switch No.2 - Photograph

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KEYPAD CIRCUITS

Keypad No 2
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 Keypad Switch No.2 . It's a simplified version of the Universal Keypad Switch . The design has been modified to reduce the complexity of the circuit - and the number of components required. As a result - the code is somewhat less secure. However - there should be lots of situations where it will still be adequate.


A Photograph Of Ron J's Keypad
Controlled Switch No.2 - Circuit Board


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Keypad No 2
Schematic
The Rest of Ron's Circuits Write To Ron More Free-to-Use Circuits Circuit Exchange International