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4hv.org :: Forums :: Computer Science
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<OT> Arduino flambee

Author Post
Wed Feb 17 2010, 09:40AM Print View
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: Republic of Guernsey
Posts: 3803

Um, did someone order their Arduino deep fried and extra crispy? :)

Share your OC'ing stories here..
I've managed to get a 20 MHz rated 12F675 up to 27 MHz reliably to use as a scope, but it doesen't always work on all parts.
Supposedly the '683 (rated 20MHz max) can be pushed to over 33 MHz if the power supply is increased to 5.3V and well stabilised (in fact the main issue is the chip becomes sensitive to normally minor power glitches it seems)

I also discovered that even CMOS spy cameras can be overclocked, replacing the crystal and converting the video signal can generate higher frame rates - or underclock for long exposures.

EDIT:- this trick works well on the cheap B&Q CCTV cameras with the easily removeable window yielding a nice exposed chip ready for epoxy and pyrolytic graphite "window".
the chip then works as an alpha and x-ray visualiser, better still back-coat the window with ZnS:Ag scintillator and then supercool the chip (not tried yet due to lack of ZnS:Ag)

note, most if not all webcam and CMOS sensors inlcude lead in the glass, so without removing the window the performance will be poor and out of focus.

"Bother" said Pooh, as he failed to find the Higgs Boson...

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Wed Feb 17 2010, 12:48PM

Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Both the PIC12F675 and the PIC12F683 are rated for up to 20 MHz clock speed, the 4MHz respectively 8MHz you mentioned are the speeds of the internal oscillators.

Anders M.
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Wed Feb 17 2010, 02:30PM
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: Republic of Guernsey
Posts: 3803
ok, so thats a 7 MHz overclock then.

interesting though..

EDIT: it appears that my 12F683 is damaged, as it also fails to run a test program correctly.
the fault manifests itself as random glitches when visualised on my newly purchased Saleae Logic analyser.

any ideas? i don't really want to trash this chip as its brand new.
i am wondering if it could be power related..
EDIT: turned out to be noise on my programmer.

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