mrburnette:
Crazy talk: for anyone using the internal 1.1V AD reference, you can achieve aroundv5% to 6% temp reading from a "T" thermocouple without an amplifier! See here
I was involved in commercial HVAC and when you see the names Honeywell, Johnson Controls, Siemens, etc, you do not think that 'casual engineering' carries the day.
I was doing industrial accuracy, 1/10 of a percent, they were doing 5-10%..
my request was because I am trying to figure the most rugged, low cost, reliable, temperature sensors, and 2-3 degrees is fine. 'calibration' of often putting all the sensors in the same duct, running the fan and setting them so they all read the same at some common point, like room temperature.
I am looking at RTD's for their simplicity and ease of use. the MAX6675 caught my eye as it offered no need for fancy math, was just a library function and was serial input. so my 5 temp sensors was no big deal.
Add a current sensor and such and it is simple enough for a NANO to handle.