To get ready for the Robot Contest event on 1/16, I order the RMB 58 RC cars from Taobao. This RC car is good size and properly built. Originally, I wanted to go with the route of replacing the control board with Arduino and drive everything there.
As I was trying to hook up the motor to Arduino, I realized that there wasn’t any H Bridge and it was way too cold to go out and get it. Hmm… I figure there must be some H Bridge on the control board I just rip out of the car.
As I located the two H bridge on the board, I notice the RX-2 chip. Out of curiosity, I decide to google for this chip. To a pleasant surprise, I found RX-2/TX-2 Datasheet in Chinese and guide for exactly the board in the car and remote.
Decide to replace RX-2 in the car with Arduino so the H-Bridge on board can be reused and the RF for the remote can still work. Still trying to figure out what I am going to do with those remote control signal. A few facts about RX-2/TX-2 chip I found is that the RC frequency can be adjusted by different resistance from 100K to 500K Ohm between OSCI/OSCO pins.