I was able to add a 3rd channel to an rc car remote for the firing mechanism today. I opened the controller and rc car and looked up the inputs and outputs for both chips on google. I also tested them with a motor and two wires before I realized the info would probably be online. There was a "turbo" input and output on the car I had. I connected a button to the turbo input pin and the battery on the controller, so when I pushed the button the chip would send the "turbo" signal out of the antenna for the reciever to pick up on. I then connected a transistor to the turbo out pin on the cars chip and to a motor and a battery. Now when I press the new button on the controller the 3rd (new) motor in the rc car turns. This will be connected to the air soft gun and used as a firing mechanism. Unfortunately there are still parts that won't be here until wendsday(dec 10) and not much more progress can be made until then. Its cutting it a little close but it will be a completed project by the 12th. Despite this success I realized were not even using the arduino so I bought an xbox reciever and a usb shield. Iv all ways thought It would be cool to control an rc robot with an xbox controller and now I can try. Have I bitten off more than I can chew in 2 days? we will see.