Hi,
I'm going to buy a water meter that has a 24V reed sensor, how can I connect it to the Arduino that is 5V or to the Pro Mini that is 3.3V?
Thanks!
Voltage divider or optoisolator.
Or transistor switch.
What is a 24V reed sensor?
I am going to guess that you mean it has a reed switch inside and I am further going to guess that it's voltage free.
If my guesses are correct you just connect it between 0V and an input and use any of the examples for reading buttons that you can find on this site.
For a reply that includes facts instead of guesses please post a data sheet for the meter.
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That's what I thought too!
I now realize that it may be the load that the reed switch can support: 24V 100mA (yeah, I forgot to write the 100mA in the first post...sorry!)
Post that link to the specs or datasheet, it's the only way for us to be sure. But it does sound like that's the maximum the reed switch can handle. In which case it will work fine with 5V or 3.3V and a much, much smaller current.
Here is the datasheet (sorry, it's only in italian). 24V 100mA it's written only in the offer
I don't read Italian, but from what little I can make sense of I am pretty sure it is just a dry (voltage free) reed switch, in which case you can do as suggested and use it like a button input.
That data sheet is useless from an electrical/electronic point of view, it contains only mechanical specs. Suggest you install it and check the outputs with a multimeter. Is there any voltage between the wires from the meter? (I guess not, it's unlikely the meter generates a voltage from the water flow). What's the resistance between the wires, and does that change as the water flows?
Thanks!
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