Why not just chuck in a brushed ESC + an arduino to enforce the limit switches? MUCH more robust than a whole bunch of relays in a combat robot, much more compact and gives you a greater amount of options on how to impose limits.
You also have a huge misunderstanding of the RX channels. They are not sending voltage, they are sending a digital signal (PWM). It is actually more off than on. You also cannot draw that much power from the signal line without likely blowing the RX. So you need something that takes the signal of the RX and switches an output. At this point a Brushed ESC really is simpler, likely cheaper and more robust.
EDIT: Just realised you have a servo switch inbetween for the RX->Sw conversion. You are vastly over complicating the system with very outdated components that do not fare well in a combat robot.
Other things, if you have a weapon use that for self righting, or if you're putting this in without a weapon just make it a lifter. A 500w scooty motor is a heavy thing to have only self righting in your robot. It's far more efficient on weight to combine it with your weapon.
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