Blog #2: Profiling the heat distribution in a room - Setup

RE: Blog #2: Profiling the heat distribution in a room - Setup

DAB — Sat, 17 Sep 2022 18:47:02 GMT

Good update.

RE: Blog #2: Profiling the heat distribution in a room - Setup

michaelkellett — Wed, 14 Sep 2022 10:06:57 GMT

Interesting intial blog:

The issue of oversampling has been discussed in comments on some of Gough Lui's Thermistor blogs.

It can do 16-bit resolution with oversampling.

Some microprocessor and oscilloscope manufacturers have confused the issue of oversampling by making some rather wild claims about its benefits, it can be very useful but:

Oversampling can only increase the resolution in special circumstances, put simply you need a signal that varies significantly from sample to sample. If the ADC is non linear in certain (common) ways then simple oversampling and averaging will not (usually) improve things. If the signal is noisy (or you deliberately add noise or dither) this can help.

Generally, if you want 16 bit ADC performance you will need a 16 bit (or better) ADC !

Luckily you can get pretty good temperature measuring precision with thermistors and 10 or 12 bit ADCs.

RE: Blog #2: Profiling the heat distribution in a room - Setup

ntewinkel — Wed, 14 Sep 2022 04:29:16 GMT

Great blog post! You’ve done a lot of work!

I forgot about the Arduino Nano 33 IoT… I might need to get one [emoticon:0f36700dfeb3494fa10d47dd9e1f90a1]

Ps, You don’t have to use 5v, it’s probably easier and safer to use 3.3v as the thermistor vcc, connect the 3.3v to AREF, and set reference to external - the Adafruit example you linked to has the details, and the code.