water metering

[peter222]

Hi,

I have a water meter with a built in reed relay. It's current should not exceed 10mA. My questions are:

To which digital input should I connect it? Any or better INPD4?
Can I use temperature measurements at the same time on other digital inputs (DS18B20) ?
Should I add any additional circuits to limit the current on the input below 10mA or it is done by LC?

Thanks,

peter