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



Click here if you're new to constructing stripboard projects.

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


Free Web Hosting