Vesa Perala" wrote:
>I'm just designing such a device (based on the need from the
>last years photo projects) for me and my friend.
>It will be a processor controller device and as "suggested"
>it will use a delay to trigger the slower camera(s).
>
<snip>
>Now:
>Do you have good ideas (more of them) about what to use to
>drive the remote switch pins:
>relay, optoisolator, just a buffer IC or something else?
>
I fire my A2E (EOS5) from a garage door remote transmitter/receiver
pair. The camera interface consists of an NPN transistor (2N3904). It's
base is driven from the receiver circuitry through a 47Kohm resistor,
while the emmitter is connected to the camera's common (longer) pin, and
the collector is attached to the camera's shoot pin. While this only
triggers one camera at a time, multiple transistors could easily be used to
trigger multiple cameras with this method. Each collector goes to a unique
camera, all the emmitteres are tied together, and the source end of the 47K
resistors are all driven from one trigger source (~3 to 6volts - even a
modified flashlight would do).
My first version of this interface included a control wire for the
focus input as well as the fire input, the second version had a diode to
pull the focus down when the fire was activated, now my final version
simply uses the fire/shoot input and leaves focus untouched (open
circuited). Works great! Needless to say you have to manually focus the
lens beforehand,
Jim Nagy
Elm Electronics
ICs for Experimenters
http://www.elmelectronics.com/
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