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Originally posted by Sabz5150
Wow, didn't think anyone would be this interested in my lil hackjob

Making it work is easy, but needs a little bit of electronic knowledge. The buttons on the transmitters are simple pushbutton switches, so all you need to do is replace them with something that can be digitally switched... transistors. Replace the switches with transistors, with the collector and emitter pins in the place of the switch's pins. Now, you can either touch the base pin to ground or positive and trigger the controller.

Depending on how your transmitter is wired, you'll need to use either PNP or NPN transistors. This is where the electronics knowledge kicks in. If you're unsure which you need, test. Wire one up temporarily and trigger it. Touch the base of a PNP to the negative side of your batteries, and vice versa for NPN. If it's the wrong one, it will get very hot very fast. Use the other type.

You'll use the same type of transistor for all 4 buttons, so the hard part is done.

Data port time Your best bet is to buy a male DB-25 port from Fry's or RatShack. Connect each base pin of the transistors to a data pin on the DB-25 port. Pins 2, 3, 4 and 5 are what I used. After that, connect a ground pin (Pin 18) to the negative side of your batteries.

That's it for the controller mod We're still working on software, so that is still a little ways away from being complete. If you can hammer out some code, then you should be able to write a program to control it. Just send high or low signals to the parallel port on pins 2, 3, 4 and 5 to control the car's movements. Depending on the type of transistors you used, either the high signal or low signal will trigger the controller.

Sorry about the quick bang-up howto. I'm working on one with pics and diagrams, so stay tuned

Our next project is coming along well. We took a mouse apart, and used the rotating axles and sensors to count rotation over time... and will hopefully be able to plot it on a graph. Yup, a micro sized desktop dyno

do i see duct tape in the future hehe and will it work on overlands and racers