The basics of this modification are derived from the
great work of Steve Chambers
and his colleagues at QCUIAG
COPYRIGHT NOTICE! The inventor and author of the
basic idea of this modification is Steve Chambers. The author is asking that the information about modification is not used by others for personal gain. Any individuals or companies wishing to produce commercial products based on
the modifications shown on his website please contact him directly.
This is the first publishing of the
modification applied to the Logitech QC Pro 3000 cam. Please do not copy
for other purposes than personal reference or publish information shown on
this web site without asking the author (me).
may find the reading here useful for the basics in low exposure
Here is an animation
which may help to understand how such a modification will allow long
exposure imaging (it is a large animated GIF file
114kB size - allow some to for the download)
Basic work has been done by modifying a Vesta WebCam and the one
used is controlled by a Phillips SAA8115HL through a NEC
uPD16510 vertical CCD driver.
Going through the specs of the SAA 8116HL and the Sony
driver chip CXD1267AN I assumed that it
should be possible to apply this modification in a similar way to the Pro
The next step was to establish the pin-out and the
required interfacing for the CXD1267AN chip. I took the approach of JP.
Bourgeay who uses bipolar switches to control the shutter and exposure
control lines. After the first run I decided to use two interface lines to
control the shutter and the gate independently of each other. (While the
original layout uses an MC4066 I had only an MC4016 at hand - same pin-out
but somewhat more 'ON' resistance - it worked out to be OK). You
will find my final layout here. The design is made, that the cam is working
in regular mode if the parallel plug is not connected to the PC - but
avoiding the switch which was used for this purpose in the original
Where and what to do
After this rather theoretical journey I had to find the location of the
chips and pins.
NO WARRANTY LEFT AFTER OPENING THE
Here is some information about opening the
Prepare your working area! Use ESD equipment.
Fasten the cam to something.
Handle the cam with care and always leave the
lens within the CCD mounting it prevents dust on the surface.
The highlighted spot is the area where the mod must be
applied. Two connections must be broken up and the wiring to the Bi-Switch
You may follow the pictures to the right where the
progress is shown.
Phew - some sweat and shaky hands after this one.
But there is more fun coming up! Take the solder iron and
prepare it for 1/10mm work - I had to file at it to make a small tip;
about 1.5 mm wide worked well.
There are a lot of very useful tips how to solder and what
to do if something breaks on other pages - I do not repeat it here.
one link I found very informative (quite formal but a lot of technique explained)
Also for this step the progress is shown in the picture
line to the right.
Soldering the wires to the IC socket and the parallel plug is easy
after doing all the work on the cams tiny PCB and chips.
Again make sure that the all wires are fastened with glue or tape so
they do not break off when a cable is handled or moved around.
If you reach this step, the cam is ready to test.
If it still works - Congratulations !!!