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Unread 01-07-2002, 15:38
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Matt Leese Matt Leese is offline
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Quote:
Originally posted by Ian W.
Matt, doesn't the uP take an almost insignificant amount of power? When compared to a motor, a bunch of transistors can't take more power. And i think once the voltage drops below 9 volts, you get the low battery warning, and you start having some unexplained errors (the uP is slowly dieing). once it drops below 8 volts, i think it gives a basic error, which has the effect of shutting down the robot, cause once a basic error occurs, you must reset or power cycle.
The RC most definately does not shut itself down when voltage drops below 8 volts (I suppose my 7 was wrong; I was giving that number off the top of my head). While the RC doesn't use very much power directly, it does however control the power used by the motors. These motors in turn put a large load on the battery. When the RC cuts out because of lack of voltage (and it needs a certain voltage to continue functioning), the control signals to the speed controllers and spikes stop, thereby causing the motors to stop. There then is a significant decrease in load on the battery allowing the RC to start because the voltage has come back up. You'll sometimes see teams with their lights going on and off (it frequently will die any time they try and move because the battery can't support the load of the motors); this is generally caused by a too low battery.

Matt
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