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Motorcycle Alarm Teardown (or Why you don't want to buy a cheap alarm)

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phil_jp1:
I've got my hands on a cheap motorcycle alarm, and so I have made a small teardown with simple analysis of its internals.

You can find full teardown with high-res photos and waveforms here:
http://goo.gl/XXE65

And here I'll only put out some photos.
p.s. Any feedback is highly appreciated!











- Phil

T4P:
WTF at the bodging ...

phil_jp1:

--- Quote from: T4P on August 28, 2012, 02:53:20 pm ---WTF at the bodging ...

--- End quote ---

You mean the small red jumper? I put it there to isolate power from RF module. To measure RF module current consumption.

T4P:

--- Quote from: phil_jp1 on August 28, 2012, 02:55:09 pm ---
--- Quote from: T4P on August 28, 2012, 02:53:20 pm ---WTF at the bodging ...

--- End quote ---

You mean the small red jumper? I put it there to isolate power from RF module. To measure RF module current consumption.

--- End quote ---

the bodging of the IC (the blue electro cap)

phil_jp1:

--- Quote from: T4P on August 28, 2012, 04:00:19 pm ---
--- Quote from: phil_jp1 on August 28, 2012, 02:55:09 pm ---
--- Quote from: T4P on August 28, 2012, 02:53:20 pm ---WTF at the bodging ...

--- End quote ---

You mean the small red jumper? I put it there to isolate power from RF module. To measure RF module current consumption.

--- End quote ---

the bodging of the IC (the blue electro cap)

--- End quote ---

I first wrote about that, and then edited my comment :)
I think they didn't have enough space on the board to put decoupling cap, so they put it on top of the micro.

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