Re: simple robotics project
- From: Joe Strout <joe@xxxxxxxxxx>
- Date: Tue, 29 May 2007 21:06:41 -0600
In article <1180467850.104022.209040@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
dmehling@xxxxxxxxxxxxxxxxxx wrote:
Couldn't I just determine through trial and error how many times the
motor needs to rotate in order for the arm to reach the desired
height.
I'm assuming that you already know that. The issue is, how does the
controller know, at any given point in time, how many times it has
rotated? For that you need a sensor.
Without a sensor, the best you can do would be to just turn the motor on
for X seconds. But that will be very imprecise -- the amount it
actually turns in that amount of time will vary with the current, what
other loads are on the system, how much weight it's carrying, etc. If
you can be sure that all those other variables are exactly the same from
run to run, and you don't need too much precision anyway, then you can
probably get away with doing it this way. Otherwise, you really need a
sensor to measure what the motor is actually doing.
Best,
- Joe
.
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