Rotational encoder help please!
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Posts: 46,084
Hi,
I needed some help with a rotational encoder I'm trying to make. The
idea here is to have a vertical PVC pipe and some sort of system to
count the revolutions. I was thinking along the lines of maybe
cutting a small hole in the pipe, and putting an IR LED inside the
pipe and the receiver outside the pipe so that every time the pipe
turns one time the hole lets the IR light shine through. Do you think
this would work? Is there something better then this?
Thanks in advance!
E
I needed some help with a rotational encoder I'm trying to make. The
idea here is to have a vertical PVC pipe and some sort of system to
count the revolutions. I was thinking along the lines of maybe
cutting a small hole in the pipe, and putting an IR LED inside the
pipe and the receiver outside the pipe so that every time the pipe
turns one time the hole lets the IR light shine through. Do you think
this would work? Is there something better then this?
Thanks in advance!
E
Comments
Air_force@w... writes:
> Hi,
>
> I needed some help with a rotational encoder I'm trying to make. The
> idea here is to have a vertical PVC pipe and some sort of system to
> count the revolutions. I was thinking along the lines of maybe
> cutting a small hole in the pipe, and putting an IR LED inside the
> pipe and the receiver outside the pipe so that every time the pipe
> turns one time the hole lets the IR light shine through. Do you think
> this would work? Is there something better then this?
>
> Thanks in advance!
>
> E
>
Your idea will work.
For a LITTLE more simplicity you may want to consider a magnet mounted on the
pipe and a magnetic pick up sensor on to sense the rotation.......Less
wiring....
[noparse][[/noparse]Non-text portions of this message have been removed]
Air_force@w... writes:
> Hi,
>
> I needed some help with a rotational encoder I'm trying to make. The
> idea here is to have a vertical PVC pipe and some sort of system to
> count the revolutions. I was thinking along the lines of maybe
> cutting a small hole in the pipe, and putting an IR LED inside the
> pipe and the receiver outside the pipe so that every time the pipe
> turns one time the hole lets the IR light shine through. Do you think
> this would work? Is there something better then this?
>
> Thanks in advance!
>
> E
>
One other thought I forgot to mention. If your the IR sensors do not work
well when exposed to ambient sunlight
[noparse][[/noparse]Non-text portions of this message have been removed]
one more question: How do you count the number of events and how to
determine the rate of events (events/time)? In this case, the rate of events
would be RPM.
Original Message
From: <smartdim@a...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, June 23, 2003 3:05 PM
Subject: Re: [noparse][[/noparse]basicstamps] Rotational encoder help please!
> In a message dated 6/23/2003 8:55:53 AM Pacific Daylight Time,
> Air_force@w... writes:
>
> > Hi,
> >
> > I needed some help with a rotational encoder I'm trying to make. The
> > idea here is to have a vertical PVC pipe and some sort of system to
> > count the revolutions. I was thinking along the lines of maybe
> > cutting a small hole in the pipe, and putting an IR LED inside the
> > pipe and the receiver outside the pipe so that every time the pipe
> > turns one time the hole lets the IR light shine through. Do you think
> > this would work? Is there something better then this?
> >
> > Thanks in advance!
> >
> > E
> >
>
> Your idea will work.
>
> For a LITTLE more simplicity you may want to consider a magnet mounted on
the
> pipe and a magnetic pick up sensor on to sense the rotation.......Less
> wiring....
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
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>
Air_force@w... writes:
> Thanks for your quick response! I will try using the magnet idea! I did
> have
> one more question: How do you count the number of events and how to
> determine the rate of events (events/time)? In this case, the rate of events
> would be RPM.
>
To answer your question, need some basic facts such as:
Is the rotating device ever stopped? Also, what is the approximate maximum
rotation speed?
There are a couple of commands the stamp has that will easily count the
pulses, but depending upon answers to the questions above will determine which
command to use, and possibly some "interface" hardware between the output of the
magnetic sensor and the stamp...
In summary though, it will not be difficult, the stamp can easily be
configured to measure the rotation speed of your rotating device.
What is the minimum and maximum revs/min? How accurate does it need to be?
[noparse][[/noparse]Non-text portions of this message have been removed]
This is a testing device to measure the effects of water over pipes
of different diameter at different speeds.
Also, what is the approximate maximum rotation speed? less than 100
RPM And the min would be about 20 RPM.