[email protected] wrote:
> what i meant is, the scooter throttle gives the variable speed, but the
> relays change the polarity to the motors - is this right?
Correct. Although they sell scooter controllers that have "reverse"
speeds, there aren't as many models to choose from and the reverse
speeds are usually slower than the forward speeds (after all, you don't
really want a scooter going backwards that fast). So, I use two
automotive relays to implement forward/reverse at full speeds. The
circuit ensures that the relays are only switched when the speed
controller is at zero to improve relay reliability.
In fact, I now have 2 different speed controls (12v @ 15A and 24v @
500W) and 3 different sets of relays (micro 10A, small 15A and large
40A) that I can use with the same circuit. The prototyping stage is
basically done. Now I'm working on the final design of the circuit
board and the software that provides all of the various features. The
goal is a single inexpensive controller that can be plugged into any R/C
system to control all tank subsystems, including main drive, rotate,
elevate, and fire control. The circuit will be configurable via a USB
cable from any PC using a graphical user interface.
Frank P.
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