I'm actually trying to make exactly the same thing ! Good job for the reverse engineering.
I'm going to try reverse engineering with :
Canon EOS 1000D + lenses EF 85mm f/1.8 USM + extension lenses Kenko 12mm (it is modified to connect my electronic board of devlopement). I'm going to start as soon as I receive all this products.
I've found some interesting informations, you can see there are 4 kinds of USM motors here (p.21) ->http://software.canon-europe.com …F_Lens_Work_Book_9_EN.pdf
So there are 2 MIcro-motors USM and 2 rings motors USM and and I think the datas to send them is different for each motors...
You can also see on page 8, informations about which datas are transmited.
Can you tell me more about :
- the micro controllers you use
- how do you "listen" the communication between lense and camera? Do you use logic analyzer?
- what are the power supply voltage for motor and electrmagnet ? I have seen there is only one pin for voltage, il supplies both ? It seems strange.
I don't understand why do you need a teleconverter? 8 pins are sufficient to control aperture and focus of some of Canon lenses ; a teleconverter adds 3 more pins to listen so this more complicated.
This will be very cool if we could work together !