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proximity sensor interfacing with mcu

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snehamatondkar

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I have pnp type proximity sensor with output current 200mA & want to interface it with mcu at89c51
please help me as I am confused about interfacing current output to mcu
Can we use relay & optocoupler if yes please send circuit or suggest any other possible way

Thanks in advance
bye
 

siongboon

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If you only want to connect the output to your microcontroller,
you do not need to worry about the current. The current specification
is for those designer who want to drive a load directly.

A pull down resistor will be more than enough to interface to your microcontroller.

Some standard ways of interfacing npn or pnp transistor.
http://www.siongboon.com/projects/2006-06-19_switch/index.htm#Transistor as a switch

As long as you have understand the concept of using transistor as a switch,
you should be able to design the required interface.
The reference should be quite useful to help you understand.

from:
Siong Boon


I have pnp type proximity sensor with output current 200mA & want to interface it with mcu at89c51
please help me as I am confused about interfacing current output to mcu
Can we use relay & optocoupler if yes please send circuit or suggest any other possible way

Thanks in advance
bye
 

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