Thanks for the heads up JohnRob. I'm going to have to take a good look at that to see If I can do it on the PCB I currently have coming in. Worst comes to worst, I know I can eliminate the caps. Several people have made these without caps and never reported issues.
The OP asked me to suggest what I thought was wrong. They were calculating Thermistor transfer functions. I just sketched what I thought he wanted to accomplish and posted it.
That is a schematic for making a PCB board. Since the thermisters are not part of the PCB board, they are not shown on the schematic. They would go on connector JP3 across pins (13 and 14) for the condenser and across pins (15 and 16) for the radiator. For my testing a two resistors were placed across those pins in place of the thermisters.
You don't seem to be understanding much here, and you are making me very angry. That schematic you posted can not possibly generate a voltage for you to measure. No way it will not.
The fact that you are saying that it does means you have missed something out of that diagram, I am trying to find out what the hell it is. You not answering all my questions is not helping.
Last time I ask you.
What is in your circuit now that is not in that schematic?
Again I ask is there anything connected in your circuit to that connector that you are not showing?
Perhaps we are getting ahead of ourselves. For us the schematic is a vehicle to understand and help creating a working circuit.
Moving that to a schematic representing a circuit board is for the future. First there needs to be a fully functional schematic Diagram. We cannot help without understanding EVERY part you plan to connect to the Arduino pins.
If this doesn't work for you please let me know and I will step back and offer no further assistance.
Not at all JohnRob. But this thread was about understanding how the AnalogRead() works. The circuit itself has been designed and tested without caps, mostly on the Allabout circuits forum and with the latest aspects of it right hear. All physical testing was done with pots in place of the thermisters. The caps were added in my last thread which you can see here. If I got it wrong I can leave the caps out or possibly drill some of the holes bigger on the circuit board to put them in different places. I do not expect this to be the last board I will be making
With the pots in place the circuit was only tested to make sure I had control over the fan. So I was using AnalogRead and never needed to know what it did. Now I need to set threashold based on the voltage values.
So please stay on board.
Thanks
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