The maximum embarrassing christmas present

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The maximum embarrassing christmas present

Postby form » December 20th, 2011, 7:05 am

I was thinking, what christmas present i can send a friend, which really annoys him.
It should automatically starts when he unpacks it, so an idea for a light-sensor came up.

So i collected some garbage and soldered around. The result is:
- 10 Watt active loudspeaker
- 12,6 V / 10 Ah li-ion cells from an old laptop
- Photodiode for light-detection
- WAV-Player with SD-Card (based on http://elm-chan.org/works/sd8p/report.html)
- Standby-Current: 7 µA for 8 seconds, then a few mA for a few ms to check for light, in a loop.

By using 1,5 hours sound from a 18-rated "sports-"movie, it should not only be annoying but also really bad embarrassing for him, when his parents hear that sound from his room :oops:
To switch it off, he has to press the power-button 200 times, so it takes a bit :D
The package is still on the way to him - When it arrives i'll keep you updated if we are still friends anymore...


How it was looking before:
Image Image Image


Building Battery-Pack from old Laptop:
Image Image Image


Connecting the amplifier with bypassed volume-pot:
Image


Building Wav-Player and Light-Sensor logic:
Image Image Image


Ready for shipping :)
Image Image Image

Schematic, Source, HEX-Files....
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form
 
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Joined: December 13th, 2011, 2:14 am

Re: The maximum embarrassing christmas present

Postby brianbenchoff » December 20th, 2011, 7:48 am

Alright, that's evil.

Love it.
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Joined: July 23rd, 2011, 7:06 pm

Re: The maximum embarrassing christmas present

Postby form » December 21st, 2011, 12:37 pm

Arrived at the victim today...
He opened it in the kitchen, with his whole family around him! Haha...

The plan was, they hear it from his room - but okay, so it was funny for all :)
Surprisingly he did'nt smash it, and shut downed it according to the rules - So he can make another guy happy now.
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