Jumping in to electronics

by on Nov.12, 2010, under Arduino, Electronics

So i have finished reading,Make: Getting Started with Arduino for the 2nd time. I have Gotten a few chapters thoughMake: Electronics” . I decided to try and put together a quick proof of concept on the breadboard for the circuit i need to create in order to make the shutter open for a period of time and then close.

I have a Canon 40D as my primary camera, this is the one i use to for the long exposures.

So for my proof of concept, i opened my canon rs-80n3 shutter control to see how the wires need to be setup. I have three alligator clips which i use to connect wires to the bread board.


There are 3 pins on my canon 40d, shutter, auto focus and one to make the connection back to the camera.

Ive read that a lot of people use an optoisolater to to trigger the shutter. I couldn’t get that to work, so i ended out using an npn transistor.  Then i could use a small current to trigger the shutter.


I have a 6volt battery pack connected for the power (4xAA). I have used a 22k resistor to limit the flow from the power rail to the transistor.

So when i turn on an off the 6volt battery pack the stutter opens, when i turn it of the shutter closes.

I also hooked up a button to test out, which worked too.

So what i get out of this….

I managed to get the shutter to open and closed based on whether there is a current passing through the npn transistor.

I got to learn about transistors,  optoisolators and ohms…..

I didn’t fry my camera.

Some other pictures can be found at:


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