ADCIN giving inconsistent results

[triton99]

mister-e: Thanks for the document on reducing system noise. I dont know how I missed that one.

Charles Linquist: Thanks for pointing out reseting the V_Total variable. My brain sometimes gives me flawed logic...

HankMcSpank: I orginally tried to use the ADC directly using ADRESH. For some reason I could not get it to work. Once I get back home I will mess with it again. It seemed like a better approach.

Thanks again everyone, and I will be testing this again today on the car, so I will post the results when finished.

[triton99]

After a few weeks of work and family things, I finally found the time to complete the project. The ACDIN results were inconsistent at first, but I etched a new board and instead of SMD components I used thru-hole. The new board worked perfect on the bench but failed on the car...until I realized I had used a NPN transistor instead of an PNP. Before I realized this I made a small relay board that the transistor would switch, which would then turn on the cooling fans. I salvaged the relay from an old TRS-80 motherboard that was ruined. Once the transistor was swapped out and the relay board added, everything worked perfect. We took some test runs, and the cooling fans turned on/off as expected. When the transistors were switched I also had to reverse the high/low settings on the relay outputs on my board. My personal blog has a little more info. http://triton9.wordpress.com/
Thanks again to everyone for all the help!!

[Dave]

I specialy like the custom MicroChip enclosure.....

[triton99]

Yeah...cant beat free!! I have a few of those sitting around gathering dust so it seemed like a perfect reason to get rid of one. First we cut a small rectangle in the top for the relay, then my friend drilled some holes for airflow.

[Dave]

It's even antistatic.....