I saw some radio controllers for kids robots alike xbox/playstion game pads few months ago. But I couldn't find them by searching. I am looking for some cheap radio controllers for RC cars or other kids robots like console game pads.May you help me?
What about using an inexpensive 2.4GHz RC transmitter?
I already had one for a WLToys V222 quadcopter If you don't already have one, you can pick one up on ebay for \$5 to \$15.
I opened up the quadcopter and Identified the chips it used
Based on this, I found the NRF24L01 which appeared to be compatible which I purchased on eBay for a whopping \$0.67US. Add a \$15 Arduino Mega (or a $2 Arduino Nano clone) and you are all set to go.
After a bit of time and part in hand I hooked it up to the Arduino and I was able to control a servo using my inexpensive wireless controller.
My guess is that the protocol varies depending manufacturer; so, a bit of reverse protocol engineering may be required. If you would like more information on the code and config for the controller I used, Up Vote this and add a comment.
There are also 2.4GHz gamepads available for a similar price. Their protocol might also be a bit different; so, a bit of reverse protocol engineering may be required in that case as well.