[James Hudak]

In no particular order:

1) Shaft encoders that have quadrature outputs, which provides a way to know which direction the shaft is turning.

2) Screw-drive components like several lengths of screws and a easy to install block that will be pushed/pulled with the turning screw. It should also have an ability to slip if the block is stuck.

3) Gender-changers for using standard RC servos. It could just be a short, male to male adapter wire, or even a simple set of 3 pins that fit the RC servo's connector.

4) Vex output compatible Relay control module. It should have a LED on it to verify that its on. Just screw terminals would be fine for hookup. This would be good for high-current devices that can't be driven with the Vex controller or electrical system.

5) Wireless modules for PC to Vex control, debug and programming as well as Vex robot to Vex robot. Vex cluster bots will need this for sure, and the PC wireless would save a lot of time, and wear and tear on the wiring. It could be a proprietary module and protocol, or it could be something like bluetooth, or even infrared.

6) General-Purpose voltage measurement module with filter and pre-amp. This could be a small module that can take voltage measurements from any item, even if it's not within the controller's range of 0-5V. Just a couple of pots on it could set the desired low and high thresholds. If the input signal is very low-level, then a preamp could amplify it so the Vex controller could measure the device with maximum resolution and accuracy. A simple noise filter would not hurt either.

7) Robot kill switch for run-aways and debugging without servos moving. This could be a emergency stop button that locks into the "off" mode when pressed. It could look just like those red e-stop buttons found in industrial systems. This switch could also be used to disable the servos when the robot is on the bench.

8) Locking toggle or slide switches. These would just be on/off switches that lock into one state or the other. These could be used for debug, and for any program function checking for a digital input.

9) Longer screws in standard parts. Sometimes the long screws are too short for the application, that also includes the extra long ones in the track kit. About 50% longer should be enough.

10) Some kind of photo sensor for a variety of applications. It could be used as a photo-interrupter for making encoders and making non-contact limit switches. Perhaps a matching transmitter would work with the existing photo cell sensor. A infrared transmitter / receiver pair would work well too.