Convert 24VDC(Proximity sensor) TO 5VDC(Arduiono Input)--NEUBIE

Other Hardware General Electronics
1

Hi all,

I mostly deal with Industrial PLCs so never had the need to convert my 24vdc signal to 5vdc.

I've seen a lot of ways to go the other way ie Relays.

Here is a quick sketch I came up. Going to start sourcing the parts to build it, but before I do. I was wondering if anyone has come up with it already.

and no using 5vdc sensors is not an option :slight_smile:

I'm attaching the image of it. Don't know how to post it with in the thread :confused:

Thanks.

Angel
California, USA

sketch24vto5v.JPG
sketch24vto5v.JPG897×434 22.2 KB

2

It might be best to use an opto coupler to avoid ground(loop) problems.

Opto transistor emitter to Arduino ground, collector to a digital input with the internal pullup resistor enabled.
Opto LED with a suitable current limiting resistor (1k or 2k2) to the 24volt source.
Leo..

3

In the circuit you posted, you don't need anything more than the resistive voltage divider R1 and R2. Connect the 24V and Arduino grounds together and the R1/R2 junction to the Arduino input.

Check the data sheet for the sensor -- many have open collector outputs, which makes interfacing to a 5V circuit completely trivial (no extra parts at all).

4

Opto-coupler is the go. One opto-coupler, one resistor.

5

I did my 24V to 5V with resistors but give my vote to the idea of opto.

Needed mine for the same reason as you industrial to arduino using an 827C-D5NP18D 10-30 VDC to read the stroke of a bar shear for a parts counter that could count in multiples of any number I gave it. (ultimate batch counter)

I did suffer ground issues in the prototype that I could have avoided with the opto method.

6

. I tried the R1/R2 for now an that works like a charm.

Looking into the Opto coupler as well from what I'm reading it will prevent me from frying my Arduino.

Thanks to all of you for your feedback. Much appreciated.

:slight_smile:

-Angel

7

so whats your opinion resistor or optocoupoler