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Jul 27, 2010, 01:49 PM
Fly Big, Low and Slow....
Alpina540's Avatar
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Discussion

Triggering CHDK camera via circuit?


Hi, I have been trying to make a circuit that will give 4 volts on one extreme and on the other extreme of the same channel 0 volts.

It should operate from a servo plugs signal.

I don't want to hack the camera open to get to the shutter switches contacts.

Any ideas how to do this?

I tried using a servos circuit but the servo board gets very hot even though it does trigger the camera via the switch on the tx.

I would greatly appreciate any help.

Thanks

-Anson
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Jul 27, 2010, 02:08 PM
five by five
sonicj's Avatar
you can use a receiver controlled switch. link

if you are running chdk, why not use a intervalometer script?
-sj
Jul 27, 2010, 02:11 PM
Fly Big, Low and Slow....
Alpina540's Avatar
Thread OP
Because I need to take shots on my command while flying with the downlink goggles on.
Jul 27, 2010, 02:15 PM
Fly Big, Low and Slow....
Alpina540's Avatar
Thread OP
Whats the difference between that unit and this one?

http://store.diydrones.com/product_p/br-0007-01.htm

Do any of these switches run off of 6v? Anyone know one that does?

Thanks
Jul 27, 2010, 02:39 PM
five by five
sonicj's Avatar
the turnigy should run fine on 6v. it needs a common ground with the circuit you are switching. very simple if your power source for the switched circuit is the same as your bec. a simple voltage divider (trimmer pot) could be used to drop the 6v down to 4v.

not too sure about diydrones switch...
Jul 27, 2010, 03:36 PM
Fly Big, Low and Slow....
Alpina540's Avatar
Thread OP
Thanks

Could I just use a few diodes to drop the voltage down as well?

-Anson
Jul 27, 2010, 04:14 PM
five by five
sonicj's Avatar
yup. Voltage Divider Calculator

are you using the usb trigger? i started to build one of those at one point... i think i was short a button cell or something and set the project aside.
-sj

*edit - just saw you said diodes, not resistors. should work either way.
Jul 27, 2010, 04:51 PM
five by five
sonicj's Avatar
hmm... not sure if i understand this correctly, but it looks as if the chdk firmware can recognize pulse width. http://www.gentles.ltd.uk/gentled/chdk_scripts.htm

so maybe a couple of series diodes might be all thats needed?? idk...
-sj


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