Introduction
To get the cameras to trigger simultaneously, we chose to trigger them via USB using a feature of the CHDK.
![Dual camera 555 trigger](https://farm8.staticflickr.com/7053/6935669297_7f27683c21.jpg)
Assembling the 555 circuit
- Pretty good instructions come in the 555 timer package
- Potentiometer confusion
![Dual camera 555 trigger](https://farm8.staticflickr.com/7065/6935669735_fdd64f4002.jpg)
![Battery "hack"](https://publiclab.org/sites/default/files/imagecache/default/IMG_0033.JPG)
Connecting the batteries