G11 porting - page 9 - DryOS Development - CHDK Forum

G11 porting

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Re: G11 porting
« Reply #80 on: 29 / December / 2009, 03:30:27 »
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Hello you Canon enthusiasts out there, hello ERR99! :)

I tried the simple phototransistor->soundcard cable.
My first thought was: if the signals are to weak, you probably have to amplify them, just like the comparator LM311 does in the RS232 blinking receiver.

The mouse uses infrared light (>780nm) led, an so the photodiode in my mouse is only sensitive to infrared light.
Well, I have several pieces old Typhoon mini LED mice operating in the visual red range. If you were living in Germany, I'd sent you one quickly. ;)

So, bottom line is: Use only photodiodes which are sensitive to "visible" light, like the SFH 300 (420...1130nm) , because the G11 LEDs does not emit light in the infrared spectrum. So i am grounded now and have to wait until my photodiode order arrives... damned!  :haha
Surely is the blinking receiver a better way. So I'm exciting to wait for your next try! Good job, ERR99! :)

Nice greetings!
:)

Re: G11 porting
« Reply #81 on: 29 / December / 2009, 06:20:58 »
Does something "more recommendable" than the BPW 96 C phototransistor exist for building?

It depends what you can easily obtain.

Even if a photransistor has peak response in the infra-red as long as it has some response in the visible range (above 400nm generally and above 600nm for the autofocus led) it will be OK.

Here is a typical phototransistor : http://www.maplin.co.uk/module.aspx?moduleno=17936

In the circuit I described above, the transistor would be connected across the lower-value resistor.
Whenever the AF led blinks, the transistor conducts and pulls the input voltage to the sound card down to zero.

test circuit and 'scope software by pointing TV remote at the phototransistor.

« Last Edit: 29 / December / 2009, 06:24:06 by Microfunguy »

Re: G11 porting
« Reply #82 on: 29 / December / 2009, 06:23:18 »
Great work guys, I wish I could help! I have lots of phono plugs and cabbles etc and can solder. If you need any parts to help let me know and I'll buy and have sent to you or donate if there is a paypal address, and if I can help with my G11 in any way, just let me know!


Re: G11 porting
« Reply #83 on: 29 / December / 2009, 07:38:11 »

test circuit and 'scope software by pointing TV remote at the phototransistor.
Good, just returned and have all necessary stuff togetether now (as well as a raw 3.5 mm mono jack plug).
Hitting off to solder the jack plug soon - but more importantly, which circuit to build?

The one you discribed in Reply #78, Microfunguy? Hm...

-kingcang
« Last Edit: 29 / December / 2009, 07:42:10 by kingcang »


Re: G11 porting
« Reply #84 on: 29 / December / 2009, 07:51:39 »
which circuit to build?
The one you discribed in Reply #78,


Yes.

Re: G11 porting
« Reply #85 on: 29 / December / 2009, 18:13:06 »
« Last Edit: 29 / December / 2009, 19:52:28 by kingcang »

Re: G11 porting
« Reply #86 on: 29 / December / 2009, 18:45:33 »
I am sorry, I have no idea what you are talking about.

Not to worry, some photos will help.

I do not know what these references to twisted wires mean.

Unscrew the cover of the jack plug.

Solder a black or green wire to the metal part that also clamps the cable.

Solder a red wire to the other terminal.

Solder a resistor of a few kilohms across both wires.

Please take a photo (with jack plug cover unscrewed) and post here.

It does not matter if you have to use different coloured wires as long as I can see where they are connected to.

I go to bed at 00:45  GMT.


Re: G11 porting
« Reply #87 on: 29 / December / 2009, 19:13:02 »
Please tell me the reference number of the phototransistor you are using.



Re: G11 porting
« Reply #88 on: 29 / December / 2009, 19:47:01 »
I think it will be easier if tomorrow I wire-up a plug and post a photo.

It will give me the opportunity of testing scope software on my own PC.


Re: G11 porting
« Reply #89 on: 29 / December / 2009, 19:50:40 »
« Last Edit: 29 / December / 2009, 19:53:54 by kingcang »

 

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