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Can an LDR be used to activate a circuit after everything has been built? Answered

I working on the gender announcement for our next baby and having some slight issues with the activation action.  I have built a circuit based on an ATtiny85 that causes two separate LEDs blink back and forth at a quickening pace underneath a Batman logo or Wonder Woman logo until the LED stays light under the Superhero representing the sex of the bay...it's a BOY!   I have had some custom cardboard boxes made and created form inserts and completed the circuits but I am at a dead stop with the activation.  I have thought about contacts around the side of the inside of the box with a non conductive material that would come down from the lid to prevent activation.  My issue would be the reset and 100% success rate.   My guiness thought would be to make the circuit Light reactive but I have NO experience with this and since the circuits are done minus power and/or switch can I still add in a Light Reactive switch using an LDR?   Any help would be greatly appreciated, my wife is driving me crazy about getting these done since i"ve been procrastinating

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Downunder35m

4 years ago

Have you though about using a reed switch and a small magnet?

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njeast13Downunder35m

Answer 4 years ago

this would work but i need the circuit open until i remove the box lid. then the circuit closes and activates the Attiny85

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steveastrouknjeast13

Answer 4 years ago

You CAN get reeds that are normally closed, and opened by the presence of the magnet.

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iceng

4 years ago

Use a SPDT Reed Switch see the video.

If you live in the US PM me with your address and I will mail you one.

SPDT2.JPGSPDT1.JPG