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DS18B20 – external power — SOLUTION FOUND April 1, 2012

Posted by rik94566 in 1-wire, aquaponic automation, DIY aquaponics, DS18B20, One-wire, sensor, Stainless Steel Temp Probe, Temperature Probe.
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Thanks to help from Make:SF and Chris that follows this blog, I solved my problem with my external power when reading a DE18B20 temp probe.  As with so many projects learning how to connect things up is the important part of making them work.  But when it comes to DS18B20’s this information is hard to find.  So maybe after this post people will have a new place to find out how to power their DS18B20’s in external power mode.

SOLUTION OF THE PROBLEM:

Add a ground connection to the arduino.

I only had a ground connection between my DS18B20 probe and my power supply.  I also need to ground the arduino to the DS18B20 probe.

Here is what it looks like in drawing form:

GROUND WIRE ADDED TO ARDUINO

SCHEMATIC VIEW OF THE FIX:

SCHEMATIC VIEW

ACTUAL WORKING VIEW:

REAL WORLD VIEW

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