Running out of project ideas

[challenger909]

I am currently in an electronics class, and we were asked to design a project using:
Resistors
3904 or 3906 Transistors
555 Timer
Capacitors
Diodes
Potentiometers
LED's
Photocells
SCR 106B1
Push button Switches
Speakers

The problem is I have already built moisture detectors, police sirens, Insanity alarm (speaker goes off when lights out), and morse code oscillators.

Thanks for any project ideas

 

[cheeto4493]

Maybe hard to implement in a classroom scenario, but possibly a good prototype setup.

How about a hijacked car diasabler. If one was to exit the car with the engine running without pushing a hidden or unlabeled switch, the car switches off after 10 minutes. This would give the would-be carjacker enough time to get out of range of retaliation, but keep the car within a locatable distance.

Have a timer disable the the fuel pump relay or something. Car just dies. Would need a reset just in case you forget.

 

[user_88]

High Noon Detector

Use two photocells to view the daylight motion of the sun .... maybe with light guides made from cardboard tubes ... Connect the two photocell voltage/current outputs to an error sensing amplifier....and as the error goes to zero ... with both photocells sensing the same intensity of light ..... activate an alarm or alert of some sort...

The challenging part here would be to come up with a comparator, or error type of amplifier .... just using basic components .....

If you have some initial success, then you might find some means to improve the accuracy, and determine a more precise instant of the zenith occurrence.

 

[eblc1388]

Use two photocells and 555 to build a "theremin" or "thermin", a musical instrument operates by the hands hovering above the photocell.

One hand let you control the pitch and another control the volume.

 

[ericgibbs]

These should be useful for some newish projects.

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