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.
salam,
thanks for this, the circuit yoou paste is not clearly seen so plz sir upload this circuit in pdf forment.thanks
Sorry for the newbie question: What’s usage of H-Bridge ? Thanks.
its the transistor switching or biasing to be able to change motor rotation. either forward or reverse
where you get this ic…? where can i buy?
you should be able to find them on Taobao.
Hi. My son has a couple of cheap Chinese RC cars – all with 27Mhz RC transmitter/receivers. On of the cars I checked uses this RX-2 chip and I have a transmitter that uses a 27Mhz crystal. I want to try and replace the transmitter’s crystal for a different frequency and match it up with the receiver circuit of the car so that we don’t interfere with each other when racing together.
Is it possible to adjust the receiver circuit by just adjusting the OSC resistor on the RX-2 chip to a different resistance value? Or do I have to adjust the components for the RF circuit as well?
Many thanks. Your post was very helpful so far.
yes.. resistor in oscillator is for setting up the frequency to be generated.. u must adjust the rx too.
How to create joistyck for RX-2
datasheet for this ic availiable in below website
http://www.datasheetarchive.com/
just type RX2 in the search box
can i get a RC transmeter in 5-10 MHz. thanks