Circuit for blinking to RS232 - Firmware Dumping - CHDK Forum
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Circuit for blinking to RS232

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Offline OldGit

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Circuit for blinking to RS232
« on: 24 / July / 2009, 15:24:45 »
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Hi, hope this is in the right place.
I was asked by a couple of members to provide more detail about the circuit I used to dump the SX200 firmware to the PC RS232 serial port.
So I put this together ... http://www.zshare.net/download/63110056ac6e5f6d/

If it helps anyone then good, if anyone has any constructive comments (more info required, something not clear etc.) let me know and I will try my best to help.

Have fun.
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SX200 IS-100C
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Offline Microfunguy

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Re: Circuit for blinking to RS232
« Reply #1 on: 24 / July / 2009, 16:02:04 »
Very interesting and very useful, thanks !

Unlike running from a booted CHDK, there are no problems with interrupts from the Canon firmware.
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Offline ewavr

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Re: Circuit for blinking to RS232
« Reply #2 on: 24 / July / 2009, 18:05:02 »
My circuit for G7 blinking via RS232 was very simpe: one phototransistor and one resistor  :)
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Offline Microfunguy

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Re: Circuit for blinking to RS232
« Reply #3 on: 24 / July / 2009, 18:31:59 »
Quote from: ewavr on 24 / July / 2009, 18:05:02
My circuit for G7 blinking via RS232 was very simpe: one phototransistor and one resistor  :)

Is that because  +12V and -12V are present on the RS232 connector and do not need to be generated ?
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MrSpoon

Re: Circuit for blinking to RS232
« Reply #4 on: 26 / July / 2009, 20:42:13 »
I think the only stage left in this game of minimalism one up manship is to capture the blinking without a phototransistor at all.

I briefly considered it before just bashing an old mice to bits for parts ::)
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Offline dumper

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Re: Circuit for blinking to RS232
« Reply #5 on: 28 / June / 2010, 03:45:17 »
Anything needed to deal with environmental lighting? Is it necessary to cover the whole thing with thick cloth to shield it from other light sources?
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Offline OldGit

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Re: Circuit for blinking to RS232
« Reply #6 on: 28 / June / 2010, 09:13:44 »
@dumper,
it depends,
1) on the phototransistor / photodiode you use (infared or visable light)
2) the type and level of environmental lighting.

Easy way out , if you have problems cover with black out cloth.

I did not have any problems with lighting.
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SX200 IS-100C
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