thx for the replies rob and dc42. i apologize for my noobness before my long post here.
thx for the link to the DS18B20, i think i was looking at an IC like that. obviously there would be a bit of a cost increase. but makes the most sense. is that basically an IC that sends a digital pulse representing the temp? For now Im wondering if I can calibrate this “noise” on the software end? Like read and delay a bunch and throw out most of it. I wish I could find some sort of pattern in the ‘wavering’ I’m seeing in the reading. But there is already sampling and averaging going on so that might be the wrong direction.
I remember looking at that datasheet and reading about the resistor and potentially a capacitor to filter? My knowledge of Micro elec is intermediate at best so I’ll need to polish up my circuit reading skills and logic before understanding what’s there. I did read a post saying to put a 10k filter on the Vout to the arduino, also twisted pairs were recommended. I tried that to no avail. In figure 3 on the datasheet it shows the resistor right next to the sensor, i know it’s a diagram etc, so it shouldn’t matter if it’s at the arduino or sensor end of the wire correct? I’ll prolly try both. And it looks like Vout it tied to ground with negative leg. same in figure 4 is that correct or am i just reading this wrong.
I know this is a reach but I always like personal responses. I could wiki around and I will, but just in case someone would like some typing practice. Can someone explain how the sensor and the capacitance of the wire and resistance relate? Maybe even a simple recommended arduino diagram with capacitors and resistors?
I’m going to plug it in and mess around some more!