I am using Arduino mega 2560 board. I am working on a project of a datalogger using thermistors. My goal is to read 7 analog inputs from the arduino board coming from 7 thermistors based circuit and convert it into temperature. I am using an volatge divider circuit for each thermistor. The thermistor has 30K ohm resistance at 25°C and I am using a series resistance of 33K ohm. I want to output all the 7 channels measing temperature simultaneously with high acccuracy.
I am currently reading two analog inputs from arduino using the simulink package of arduino with 2 thermistor based circuits.The problem is I am not getting the same ADC value from both of them. I mean, they are offset by atleast ±5. Lets say, I get the ADC value 499 from one sensor and i get 495 from another sensor. It would be greatly helpful if anyone could help me on this topic. I am finding it easy to implement in simulink rather to code it in arduino IDE.
How can I do that using Arduino IDE ? I want to log all the temperatures simulatenously into a file at sampling rate of atleast 2 Hz. Please help me on this.