Hummer H2 Hack

Trezitorul

I am attempting to hack my Radio Shack Mattracks Hummer to accept commands from an MCU. My thought is to simply attach the MCU directly to the antenna and to send pulses in exactly like the remote would. Will this work? Any suggestions would be appreciated.

SRLM

A better idea would be to control the servos and motor directly. It would be difficult to imitate a radio signal with a microcontroller.

Trezitorul

Thanks for the quick response. I am assuming that the radio signal complexity problem is due to fm modulation. Would it be possible to create an fm modulator(Hardware). Then the commands from the microcontroller would simply be binary like the commands coming from from the remote ...which hopefully would not be that difficult to imitate. I have done direct motor control before. However I am exploring using the control system in place fro the rc control because it would a. Save pins on the microcontroller. b. It would be adaptable to any rc car(the car would not even have to be modified).

Post Edited (Trezitorul) : 8/16/2009 3:06:13 AM GMT

SRLM

If that's the route that you want to go, I'd suggest that you get a spare transmitter and hack it. I took apart a transmitter for an RC car, and all it had was a couple of pots that controlled throttle and steering (and a couple for trims). You should be able to use a digital pot to simulate the mechanical pots already there. Mine just created a simple voltage divider, so you may be able to use PWM and pass the pot concept completely. One thing that you'll want to keep in mind is the channel. You'd want a transmitter that could change channels by changing crystals (to match the RC car channel).