The project is about controlling small car for children. They are owned by renting shops.

These are electric remote controlled cars with one or two 12v/7a batteries, 2-5 motors like the ones in small rechargeable vacuum cleaners.

The one motor is for the steering, the rest for the wheels. Some are 4x4 so max 5 motors.

The problem is that these are bad chinese designs and the renting shop has major problem that the remote control of one car, interferes with the other, so it is dangerous when cars are near.

Usually the remote control is carried by the parent of the children in the car for the renting period, so he can prevent any accidents. The children also has control of the car but with lower priority.

My task is to design a new remote with the main specs on my #1 post.

The data sent can be kept at minimum, say 2-5 bytes at a time.

I have experience with ASK systems since I use them in my designs, but the delay is they introduce is too much.

Ioannis