Proximity Sensor Interfacing

[king]

Hi!
    I need to interface Proximity sensor with micro-controller but the sensor operates on 24V so tell me how can i drop 24V signal to 5V and i want to do this with the help of transistor not with opto coupler .If any schematic you have then plz give it to me

[chandra2sekhar2000]

HELLO
DESIGN A VOLTAGE DIVIDER NETWORK WHOSE RATIO IS 6:1(24V:4V) FOR SAFER RANGE BELOW 5V.FOR EXAMPLE USE 5K AS R1 FROM 24V OUTPUT PIN.AND 1K FROM GROUND.CONNECT ANOTHER TWO ENDS OF RESISTORS DIRECTLY TO MICRO. OR CONNECT TO A TRANSISTOR BASE(BC547) ,EMITTER TO GND,COLLECTER PULLED UP WITH A 10K TO 5V,TAKE THE OUTPUT FROM COLLECTER TO MICRO.BUT USING A SINGLE TRANSISTER WILL PERFORM NOT OPERATION.


+24V-----^^^^^----|-----^^^^^-------GND
                 5K          | O/P      1K
                           TO MICRO
                          OR TRANSISTOR BASE.

[ajak]

use a voltage regulator like a lm7805

[oldvan]

Resistor in series to limit current, 5.1V Zener from input to ground.

If sensor is in electrically noisy environment or at different ground potential than the uC, use an optoisolator.

[avrPassion]

Some of the proximity sensors are open drain. It means that if you put a resistor between their output and GND no current will pass the resistor.
My suggestion is to first check if your sensor can provide +24V in its output.

[falcon _bd]

I want to know about Proximity Sensor in details.
need some links or pdf doc.

[jzaghal]

Hi,

It is better and safer to use an opto coupler.

Why ?? you don't want to use one??

Bye.

[jenniferkim]

It is not better and safe to use an opto coupler. It will only make it harder to control.

[Donovan]

http://rchobby-net.de/fraese/endschalter/referenz.htm