I'm confused. How does a R/C car steer without a servo...
June 9, 2008
I had lying around an old R/C car an thought it would be cool if my new robot also becomes radio controlled. I took apart the thing and there were four wires on the PCB.
*Brown cable going to motor
*Blue cable going to motor
I used my volt meter to see what voltages there were on the motor. When I drive forward there comes 5 volt on the motor. If I drive backward the current reverses, and the motor turns the other way. So I could just connect these wires to my microcontroller and if one of these wire becomes high I know if my robot has to move forward or backward.
No problemo so far. Now comes the confusing part.
I thought that for left and right a similair thing would be on the board. Two wires which can reverse the current so that one way the car steers left and the other way the car steers right. BUT. there were no two wires. There were only two copper-like wire things that went from the PCB to something (dunno what this is). The weird thing is, I measured the current on this lines and when I steer left or right, no current is on these lines. Also my R/C car only steers left or right when it is also moving forward or backward. I always thought R/C cars where steered by a servo. But this is not the case here. I searched on the web for how it is done then, without a servo, but I couldn't find any usefull items.
Can someone please tell me how this steering thingy works, so I can hook it up to my microcontroller. My guess it that it works with some magnetic field thing or something.
Help is really appreciated.
If you need more info or pictures please ask.