Here is my valve controller designed for use in photographing water drop collisions. It is similar to other Arduino based controllers with some added controls It can use up to 3 solenoid valves (more can be added fairly easily) and can create up to 9 drops.
– Up to 9 drops. Each drop separately controlled
– Mirror lock up option
– Bulb mode or shutter trigger only
– Camera shutter and focus control
– Flash trigger control
– Loop mode (Keep looping until you stop it)
– Increase or decrease times while looping
– Save and load drop data
– Auto save main settings
– Quick mode when using up to 3 drops (uses a simplified display)
– Full mode when using more than 3 drops
There are 2 versions; one is self contained and operated through a keypad and a LCD, the second is controlled via blue tooth and an Android app.
The normal version
The blue tooth version
Video of the blue tooth version in use:dropController in action
Details and files are at www.dropcontroller.com