I have done something similar in the past using a Keyence displacement
sensor (www.keyence.com); this is not a low cost option though. Call in to
their very helpful applications department and one of their engineers should
be able to configure the sensor for you.
Madhu

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of carlosmarcano78@cantv.net
Sent: Wednesday, March 12, 2003 3:02 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: [OT]: Belt position sensor.


Hi guys. I4ve been having some trouble with something. I am trying to
develop a position controller for a iron ore transporter belt. I have to
use a Yokogawa uXL DCS. The real problem is that I have been told
("advised" was their word) to use a continous sensor for the belt,
something like a limit switch but instead of being a two contact switch it
should use a potentiometer to convert the belt position to an analog signal
(volts, mA). It is not necessary to get the position of the belt in it4s
complete range (I forgot to say that the position I am referring to is the
lateral position, so the belt won4t disband). The sensors should be placed
one at each side of the belt, two in total, so when the belt gets near one
of them it will send the equivalent position in analog signal to the DCS.
It has to be a contact sensor. I have been looking like a mad man on then
net for anything like this but I haven4t been lucky at all. Any
suggestions, please?

*Carlos*

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