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awthorn

Member Since 15 Apr 2013
Offline Last Active May 01 2013 12:08 PM
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Topics I've Started

DS18B20 readings in 7K range

21 April 2013 - 06:28 PM

Hello all, I am having an issue where I am at a loss. I have two DS18B20 temperature sensors hooked up in parallel reading once every second. One is on my breadboard and the other is soldered to 3 wires of a CAT5 cable about 15 foot long. If I put the temperature sensor that is hooked to the cat5 in to my fridge and the sensor performs as expected and measures around 35 degrees. But if I place the sensor into my freezer it reads as expected until it gets down to 32 degrees then once the sensor gets below 32 it begins to read in the 7k range which i know cannot be correct. 
 
I am at a loss as the sensor I do belive goes to -67 degrees F. I appreciate any help that can be lent as this is one of my first projects with my ND2+. and anything that interfaces with hardware. Thanks in advance!

DS18B20 Readings

21 April 2013 - 01:26 PM

Good day everyone! Netduino noob here and I am having an issue with a project I am working on. I have a ND2+ hooked up to a bread board with the proper connections going to the ND2+. I have two DS18B20 temperature sensors hooked up in parallel one on the board and the other through a CAT5 cable, about 15 ft long, that is soldered to another sensor. 

 

The issue I am having is when i put the sensors that i connected to the CAT5 in the freezer. I can watch my debug output of the temperatures drop and once it gets below 32 degrees Fahrenheit I start to get readings in the 7k range. Which if that is the case I don't think my ice cream is good anymore. If I bring the sensor out of the freezer and it starts to get warmer the readings start to normalize. If I stick the sensor in my fridge it will get down to 35 deg and read fine for hours. It appears to have something to do with temperatures under 32 degrees.

 

 

Has anyone had any similar experiences? Thank you all for your help!


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