Subject:
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0.5 degree resolution with rotation sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 31 May 2000 23:29:10 GMT
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Viewed:
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529 times
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Hi guys!
I've been playing with a position controller and thought that could interest
someone else.
Since the rotation sensor has only 16 counts for 1 full turn, which means 22.5
degrees, I thought about a way to get some more precision.
In order to get a 1 degree precision, a 22.5:1 gear train would be necessary,
but then, why not a 45:1 gear train? That causes the input to turn 720 times
for each turn on the output, which gives a 0.5 degrees precision.
Here is how I did it:
input legend:
| | axle
[|] sensor # technic beam
###|##|##|###|#### * 8t gear
# * *** | | # *** 24t gear
# | * *** | # ***** 40t gear
# | | * ***** #
###|##|##|###|####
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output
I hope that will interest you guys, 'cause I'm having fun! :o)
Cheers
Ricardo Andrade
San Jose, CA
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Message has 2 Replies:
 | | Re: 0.5 degree resolution with rotation sensor
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| Did you have any problem with the slack resulting from the gear train? With so much gears the error generated slack should be greater than the precision. I don't have a rotation sensor yet but some assemblies I made in the past to control sterring (...) (24 years ago, 3-Jun-00, to lugnet.robotics)
| | | Re: 0.5 degree resolution with rotation sensor
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| (...) Aren't you fooling yourself slightly here? Just because the input turns 45 times for each turn of the output does not mean that the precision of the output will be 45 times as good. What happens, for example, if you reverse the input axle? The (...) (24 years ago, 3-Jun-00, to lugnet.robotics)
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