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I did something like this using a Cypress WirelessUSB module (CYWUSB6935 to be specific), a PIC18F4550, and a run-down R/C car shell with a broken receiver. I would recommended switching to at least a 16F628A for an application such as this. The wireless code alone took over a kilobyte or two of program memory, so you will want to have plenty of room
The entire project can be found here: **broken link removed**
I am sure I didn't post something on there (like some code or something useful), so if you want anything specific to that project just ask and I will post it if it is something that I can post (some of my stuff is for commercial ventures, so it cannot be posted).