I made a small bristlebot. my version can turn left and right using two vibrators and is controlled by an ATTiny uC. I would like to add remote control functionality so i'm asking what's the simplest and smallest component(s) I can add to my bristlebot to make it remote controllable? (the size of the actual remote control device doesn't matter, just the components on the bristlebot). i want to use radio control, not IR. I have to say, comming from the digital side, I have no experience with analog circuits and RC sender/receivers so far.
thanks for the hints