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Bill Janssen posted on March 10, 2006, 7:35 pm
Looking for a chip or circuit that will take the two phase output from a
rotory
encoder and output, up, down and pulse
I can't find my copies of that circuit in my piles of paper.
Thanks
Bill K7NOM
rotory
encoder and output, up, down and pulse
I can't find my copies of that circuit in my piles of paper.
Thanks
Bill K7NOM
Gordon McComb posted on 
Jeff Shirley posted on
Re: Rotory encoder chip ?
I second Gordon's recommendation of US Digital. They have an 8-pin chip that
does exactly what you want, and they are inexpensive. I bought several, and
found them quite easy to use.
Jeff.
--
Jeff Shirley
spam-cake@mindspring.com
"Bill Gates is filthy rich, but that doesn't mean I want to be married to him."
Re: Rotory encoder chip ?
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Jeff Shirley wrote:
I went to their web page and didn't find info on the chip - will look again
Bill K7NOM
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Jeff Shirley wrote:<br>
<blockquote cite="midmWiRf.325$HW2.16@newsread3.news.pas.earthlink.net"
<pre wrap="">Bill,
I second Gordon's recommendation of US Digital. They have an 8-pin chip that
does exactly what you want, and they are inexpensive. I bought several, and
found them quite easy to use.
Jeff.
</pre>
I went to their web page and didn't find info on the chip - will look
again<br>
Bill K7NOM<br>
<blockquote cite="midmWiRf.325$HW2.16@newsread3.news.pas.earthlink.net"
<pre wrap="">
Gordon McComb <a class="moz-txt-link-rfc2396E"
wrote:
<blockquote type="cite">
<pre wrap="">Bill Janssen wrote:
<blockquote type="cite">
<pre wrap="">Looking for a chip or circuit that will take the two phase
output from a
rotory
encoder and output, up, down and pulse
I can't find my copies of that circuit in my piles of paper.
</blockquote>
<pre wrap=""><!---->
<blockquote type="cite">
<pre wrap="">Several are available from usdigital.com.
</blockquote>
</pre>
<pre wrap="">-- Gordon
</pre>
<pre wrap=""><!---->
</blockquote>
</body>
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Gordon McComb posted on
Re: Rotory encoder chip ?
Try here:
http://www.usdigital.com/products/ls7183-ls7184/
The 7184 is probably the one you're after. They're $3.20 in single
quantities.
Even if you have the ICs to make your own decoded out of gates in your
junk bin, there are a number of advantages to this particular chip,
apart from a smaller footprint on your board. The chips include signal
conditioning and debouncing, useful to prevent jitter that can occur at
an edge boundary. Also you can easily switch between 1X, 2X, and 4X
counting, which gives you greater flexibility. An external resistor (you
can also use a 10M pot in parallel with a 5K resistor) allows you to
easily set a pulse width, saving you from creating one using a 555, RC
network, or whatever.
-- Gordon
Re: Rotory encoder chip ?
Thanks , that is what I had in mind. I will order a couple - 1 to use
and 1 to burn up ;-)
Bill K7NOM
Re: Rotory encoder chip ?
Since the shipping costs will probably be equal to the cost of the two
chips, you might also look at their Miniature Optical Kit Encoder, a $20
quadtrature encoder that can connect directly to a motor shaft. While
I've also done the homebrew stuff, I like the kit because the resolution
goes up to 300 CPR (therefore 1200 counts at 4X resolution), which
really solves a lot of little problems. The thru-hole variation allows
you to attach it directly to the motor, between the motor and
wheel/sprocket/gear. Nifty stuff. I've retrofitted several devices with
quad encoders with these.
-- Gordon
Re: Rotory encoder chip ?
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Gordon McComb wrote:
I have an encoder that I intend to drive from a knob. This is part of a
DDS frequency signal source.
I have a few microprocessors and I haven't yet decided which one to use.
I will write some code
for one and if it doesn't seem to be satisfactory I will try another :-)
This project is to use parts
I already have (mostly)
Thanks, everyone for the good information
Bill K7NOM
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Gordon McComb wrote:
<pre wrap="">Bill Janssen wrote:
</pre>
<pre wrap="">Thanks , that is what I had in mind. I will order a couple - 1
to use
and 1 to burn up ;-)
</pre>
<pre wrap=""><!---->
Since the shipping costs will probably be equal to the cost of the two
chips, you might also look at their Miniature Optical Kit Encoder, a $20
quadtrature encoder that can connect directly to a motor shaft. While
I've also done the homebrew stuff, I like the kit because the resolution
goes up to 300 CPR (therefore 1200 counts at 4X resolution), which
really solves a lot of little problems. The thru-hole variation allows
you to attach it directly to the motor, between the motor and
wheel/sprocket/gear. Nifty stuff. I've retrofitted several devices with
quad encoders with these.
-- Gordon
</blockquote>
I have an encoder that I intend to drive from a knob. This is part of a
I have a few microprocessors and I haven't yet decided which one to
use. I will write some code<br>
for one and if it doesn't seem to be satisfactory I will try another
I already have (mostly)<br>
Thanks, everyone for the good information<br>
</body>
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mlw posted on
Re: Rotory encoder chip ?
You can use a D type flip flop and some gates. Put one phase into the data
input, and put the other phase into the clock, this will give you your
direction bit, and then use a couple AND gates to gate one of the phases.
Re: Rotory encoder chip ?
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mlw wrote:
Thanks for the tip. After thinking about it I came to the conclusion
that it really should
be easy with an edge clocked IC and maybe some logic. I just didn't want
to think
that hard :-) I think that the direction pulses will be what I use (two
leads instead of three).
Getting old is tough.
Bill K7NOM
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mlw wrote:
<blockquote cite="midgtadnXnM4v9-54jZnZ2dneKdnZydnZ2d@comcast.com"
type="cite">
<pre wrap="">Bill Janssen wrote:
<blockquote type="cite">
<pre wrap="">Looking for a chip or circuit that will take the two phase
output from a
rotory
encoder and output, up, down and pulse
I can't find my copies of that circuit in my piles of paper.
</blockquote>
You can use a D type flip flop and some gates. Put one phase into the data
input, and put the other phase into the clock, this will give you your
direction bit, and then use a couple AND gates to gate one of the phases.
</pre>
Thanks for the tip. After thinking about it I came to the conclusion
that it really should<br>
be easy with an edge clocked IC and maybe some logic. I just didn't
that hard :-) I think that the direction pulses will be what I use (two
leads instead of three).<br>
<br>
</body>
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Re: Rotory encoder chip ?
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mlw wrote:
78 Last mounth :-)
Bill K7NOM
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mlw wrote:
<blockquote cite="middL-dnR8QNKDRBYjZnZ2dnUVZ_tOdnZ2d@comcast.com"
type="cite">
<pre wrap="">Bill Janssen wrote:
<blockquote type="cite">
<pre wrap="">mlw wrote:
<blockquote type="cite">
<pre wrap="">Bill Janssen wrote:
<blockquote type="cite">
<pre wrap="">Looking for a chip or circuit that will take the two phase
output from a
rotory
encoder and output, up, down and pulse
I can't find my copies of that circuit in my piles of paper.
</blockquote>
<pre wrap="">You can use a D type flip flop and some gates. Put one phase
into the data
input, and put the other phase into the clock, this will give you your
direction bit, and then use a couple AND gates to gate one of the phases.
</blockquote>
<pre wrap="">Thanks for the tip. After thinking about it I came to the
conclusion
that it really should
be easy with an edge clocked IC and maybe some logic. I just didn't want
to think
that hard :-) I think that the direction pulses will be what I use (two
leads instead of three).
Getting old is tough.
</blockquote>
How old are you? I'm 43 this year :-(
</pre>
78 Last mounth :-)<br>
</body>
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Re: Rotory encoder chip ?
I hope I am as in possession of my faculties, let alone breathing, when I am
78.
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