Given my experience with the Ardiuno microcontroller I decided to build the trigger mechanism with it. My initial design is a HiTec servo controlled by the Arduino, which in turn was sent commands from my computer via a Bluetooth module. The servo will move a pushrod with a piece of foam at the end that will contact the scorpion, hopefully causing it to react by stinging the piece of foam.
Here (click to view, right click and “Save Link As..” to download) is version 1.4 of the Arduino code. All it does is take a serial command from the computer and move the servo to the requested angle.
Here (click to view, right click and “Save Link As..” to download) is version 1.2 of the Processing code that runs on my computer and sends commands via serial to the Arduino. It creates a 4×4 grid of buttons and sends various commands set in the code. Here is a screenshot: