# 555 Trigger for Synchronized Dual Cameras

by warren | 27 Feb 18:08 |

I've been setting up a 555-based timer (the Velleman MK111) to trigger 2 cameras simultaneously (see t-bracket dual camera rig and stereo camera) for infrared aerial photography. This seems to work pretty well; I don't know enough about the circuit but I wonder if I can change a resistor (maybe R2?) to lengthen the 'pause' time. Right now it goes too quickly (play the video to see)

More photos (i'll probably post a wiki page when this is complete):

It's great to see progress on the dual timer! I showed this to my son (age 12) and told him the goal was to repeatedly trigger two things simultaneously. He walked over to his computer and in a few minutes built it in Minecraft. So everybody is way ahead of me in circuitry.

Can you include two output ports (to the two cameras) on the board or will you split the signal with a Y cable?

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I found that a 12v "23A" battery (for car remotes) fits perfectly into an "N-type" battery holder, providing the needed 12v to drive this circuit. Good thing; I was worried about finding a small 12v battery, and the actual "N" battery is only 1.3 volts.

$0.45 each for N battery holders: http://www.allelectronics.com/make-a-store/item/BH-50/N-CELL-BATTERY-HOLDER/1.html (also on digikey for ~$0.60)

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Jeff, if you need to modify the circuit, look at the 555 calculator in my note on 555's.

mistake! I had the two potentiometers backwards. It allows for "trigger down" time of 0.5-5 seconds, and "pause" time of 2.5-60 seconds. Perfect!!

I was considering building a 555 timer to trigger the IR control on my camera for mapping and was wondering if you had a schematic of what you used to trigger a button press. I've also considered a camera with chdk and might go that route, but I'd need another camera.

Hey Paul - check out Mathew's post, above -- but do you mean how do we wire it into the camera? I've been having trouble with that and you can read more here: http://publiclaboratory.org/notes/warren/3-1-2012/triggering-a495-buttonusb

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