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.
    SX200 IS-100C

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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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    Re: Circuit for blinking to RS232
    « Reply #3 on: 24 / July / 2009, 18:31:59 »
    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

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    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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    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.
    SX200 IS-100C

     

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