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x301 Simple Electronic Lock Project on Tue Jan 15, 2013 10:57 am

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Simple Electronic Lock Project

A kit for this project is available from RSH Electronics.
Download PDF version of this page

There are six (or more) push switches. To 'unlock' you must press all the correct ones at the same time, but not press any of the cancel switches. Pressing just one cancel switch will prevent the circuit unlocking. When the circuit unlocks it actually just turns on an LED for about one second, but it is intended to be adapted to turn on a relay which could be used to switch on another circuit.
Please Note: This circuit just turns on an LED for about one second when the correct switches are pressed. It does not actually lock or unlock anything!
This project uses a 555 monostable circuit.

Parts Required


  • resistors: 470, 100k ×2, 1M
  • capacitors: 0.1µF, 1µF 16V radial
  • red LED
  • 555 timer IC
  • 8-pin DIL socket for IC
  • on/off switch
  • push-switch ×6 (or more)
  • battery clip for 9V PP3
  • stripboard 12 rows × 25 holes

Stripboard Layout


Circuit diagram

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