DS18B20 to Z-Uno per diagram ?????????

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poordom
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Joined: 28 Jan 2016 01:34

DS18B20 to Z-Uno per diagram ?????????

Post by poordom »

Good afternoon All,

Since my Z-Uno has been recognized by Vera, I've started with the addition of sensors, but then, I really got confused.

The DS18B20 hook up to the Z-Uno, didn't make sense to me, so I hope someone can explain the setup to me.

From what I understand, one should not connect 5 volts to input, yet the diagram shows powering up the sensor via the 5V output from the Z-Uno, the data output from the DS18B20 is connected to either pins 9, 10 or 11, instead of the AD inputs like 3,4,5or 6, why?

Thanks Guys

Dom

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PoltoS
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Re: DS18B20 to Z-Uno per diagram ?????????

Post by PoltoS »

The data pin should be connected to pin 11,OW. This is correct. But the power should be 5V since the sensor requires 5 volts

poordom
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Joined: 28 Jan 2016 01:34

Re: DS18B20 to Z-Uno per diagram ?????????

Post by poordom »

Good morning PoltoS,

Am I keeping you busy.

OK, in response to your answer, will using the 5v obtained form the Z-Uno card affect anything, if not I could use a TMP36 and a TMP35. When is it NOT recommended to power Sensors with 5 Volt, in order to avoid damaging Z-Uno.

Thank you so much PoltoS, I really appreciate your assistance.

Dom

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PoltoS
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Re: DS18B20 to Z-Uno per diagram ?????????

Post by PoltoS »

DS18B20 gives very small current and can not damage Z-Uno. It works perfectly with the Shield and with Z-Uno. We hae tested up to 32 of them

michap
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Re: DS18B20 to Z-Uno per diagram ?????????

Post by michap »

Hi,

sorry, just to be safe I would not use 5V for the 18B20 with Z-Uno.

The logic signal will be >3.3V on the output of the 18B20 what is not recommended for the Z-Uno chip (I have tested it on several sensors).
@Poltos - you are really sure that it is safe for the chip? Would be good to know.

And - the sensor does not require 5V - it is working from 3.0 ... 5.5V.
https://datasheets.maximintegrated.com/ ... S18B20.pdf

So I would try to use the 3.3V output, or work with a logic level converter for the data pin if using 5V.

Michael

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PoltoS
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Re: DS18B20 to Z-Uno per diagram ?????????

Post by PoltoS »

Well, we even have official examples in our web site.

This is data pin with very low current, so looks to be safe

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