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Reading: How to Connect Proximity Switch (Source Type) to Make LED ON ?
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Inst Tools > Blog > Practical Questions > How to Connect Proximity Switch (Source Type) to Make LED ON ?

How to Connect Proximity Switch (Source Type) to Make LED ON ?

Last updated: August 16, 2017 5:44 pm
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An improvement over direct-contact limit switches for many applications is the inductive proximity switch. This type of switch actuates simply when an object gets near it – no direct physical contact necessary!

Explain how these devices work, and what kinds of material they are able to detect ?

Inductive proximity switches are powered devices by necessity. They usually require a DC voltage for power, and their output is usually not a dry switch contact. Instead, it is usually a transistor, with the output signal being standard TTL logic (0 to 5 volts). Inductive proximity switches are often manufactured as three-wire devices:

Inductive proximity switches

Show how you would connect the switch in the above illustration so that it makes the LED turn on when actuated, assuming the switch’s internal transistor is configured to source current through the output lead.

Answer :

proximity switch wiring

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Credits : by Tony R. Kuphaldt – under CC BY 1.0

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