Thread: Proximity Switches
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29-08-2013 #1
Ok
Following on from the thread the other day regarding these inductive proximity switches. And after you have pulled yourselves back together after reading Jonathon build thread which im sure is going to be the topic of this week....
TL-W5MC1 5mm Inductive Proximity Sensor Detection Switch NPN DC 5-24V | eBay
Ive got the one on Y working, using the below wiring, however as im running two on the X (for autosquare) Im having problems with interference and I wonder if im missing a diode or something to stop feedback from one to the other?
essentially, if I wire just one... say just to pin 11 its fine, but as soon as I put two in place (ie to pin 12 aswell) I notice false positives on pin 11 if you follow?
If I do need a diode? or an additional component id be grateful for a recommendation
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29-08-2013 #2
Your diagram is wrong... the connection to the bob is from the other side of the load resistor, not gnd.
But I think you are using these incorrectly. If these are NPN the load resistor is from output to + supply, not output to gnd. And the load resistor needs to be smaller than 100k, exact value depending on whther bob inputs are opto-isolated or not.
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The Following User Says Thank You to irving2008 For This Useful Post:
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29-08-2013 #3
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The Following 2 Users Say Thank You to lateAtNight For This Useful Post:
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You might find this interesting:- Three-Wire Sensors
It explains a little of how they operate ..Clive
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The Following User Says Thank You to Clive S For This Useful Post:
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30-08-2013 #5
thankyou all for your posts, I have the sensors working now... and auto-squaring
:-D
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30-08-2013 #6
So what was the problem? Your resistors are 10k, not 100k. I think the sensors you have are not open collector, since they worked without any resistor which implies they have an internal resistor. Putting the 10k resistor from the output signal to ground reduces the output voltage to the 5V required by the breakout board since it forms a potential divider with the other resistor.
Last edited by Jonathan; 30-08-2013 at 08:02 AM.
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30-08-2013 #7
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30-08-2013 #8
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The Following User Says Thank You to irving2008 For This Useful Post:
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01-10-2013 #9
I'm starting to look at switch options for my design - are you using these proximity switches for homing?...are they accurate enough on a repeatable basis for that (ie, tool changes, flipping work piece etc)?
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01-10-2013 #10
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