On Sun, 28 Oct 2018, Chris Albertson wrote:
Date: Sun, 28 Oct 2018 10:41:14 -0700
From: Chris Albertson <albertson.ch...@gmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] 5I25-7i76 encoder output
On Sun, Oct 28, 2018 at 5:15 AM andy pugh <bodge...@gmail.com> wrote:
On Sun, 28 Oct 2018 at 07:17, Chris Albertson <albertson.ch...@gmail.com>
wrote:
Or switch to the other method. Rather then count "ticks" you count the
microseconds between the ticks.
The Mesa encoder counter already does this.
Then perhpas this is the wrong method. There are two ways to go and which
to pick depends on the encoder and how fast it spins. If you are counting
microseconds then just maybe that's the wrong way to go for a high
reasolution sensor that is spinning fast. For a high resoultion sens toy
can coubtstincks per sample period. You'd like to have at least 100
ticks per period.
Perhaps there are not enough microseconds betwen pulses. You'd like to
have at least 100 timer counts
--
The Mesa Encoder uses both methods combined = delta_counts/delta_time, so for
example if you have 7 counts between servo thread times, the velocity will be
calculated as 7/(time from first to last edge of those 7 counts)
This is optimum for most uses.
Some fancier systems automatically compensate for quadrature phase errors and
duty cycle variations.
Chris Albertson
Redondo Beach, California
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Mesa Electronics
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