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Hey guys, what is the best to way to make my robot RC? It operates on 12V and has high powered motors which i dont think normal servo drivers (gutted from old servos) can handle. Is there any way i can do it with a normal off the shelf hobby receiver/controller?
I have used a RC receiver to output its signals onto an old servo driver, i actually took the outputs from the driver board and managed to relay its signals through a couple of diodes onto a H bridge made out of relays. This method was tedious and did not allow for any speed control.
( i dont know how to post images otherwise i would have shown you the circuit)
I was afraid this would require use of micro controllers, I dont have any experience programming and dont know how to use micro controllers. ARE micro controllers absolutely necessary for this application?
Yes i did use the boards from the servos, i made a sort of rectifier out of 2 diodes, both facing opp. directions on one pin of the motor out. This effectively sorted the signals CW and CCW so that they could be used to trigger 2 diff relays. The problem was that the servo board was switching outputs so fast that my relays would cease to work after only 5 min of operation.
I believe the same 'rectifier' assembly with the use of a MOSFET Hbridge should work.
The servo board output is 6V, give or take, and the motors im running are 24V 250W. Could you suggest some suitable mosfets with which i should make the H bridge? also do you have any tried and tested schematic of an H bridge that may be useful?
I see, so this smooths our the signal from the servo board so the relays dont fry
1) because of the way the relays are wired does it mean there will be no stopping of the motor? Because when there is a low signal on the relays they would go to off position, and in process make motor turn certain direction.
2) i dont have access to pcb facilities so i will have to vero board it. Is there any more pictures of this circuit so i can plan my board better? {i will research PCB facilities and if i can manage to do it, is there a link to a PCB layout?}
3) The freq. of my servo boards is 50Hz , what should c2 and c3 be? also C6 and C7 should be according to my peak current requirements yes?
4) IC2A, B, C, D are transistors NPN, and 4001N is quad NOR gate DIP ? i want to make sure i get the right parts, it will save frustration later
488.28 Hz to about 1 428Hz is probably the PWM freq. i get this figure using the pulse widths, 0.7ms and 2ms (aprrox.)
Anyways i will start to gather parts and build this day after tmmw.