Best posts made by bschwahn

First thanks for the format used when posting!

I am going to admit a lot of first time/elementary mistakes when getting back into the M5Stack environment with my M5Dials (it has been several years). I will admit that it is strange that the DEMO firmware will work but not the actual firmware?

1. do you have any other controllers to verify your configuration?

   • is the USB cable OK
   • is the USB Port working correctly

2. are you downloading the correct firmware for UIFlow2? (I didn't LOL, I used the firmware for UIFlow1)

3. are you using the correct USB Drive for your Operating System (I had had to try different versions until I found one that worked).

4. try downloading a different version of the firmware for now

It sounds like you discovered what button you had to push to get the AtomS3R into download mode. I also made that mistake.

Could you post back once you discover what is the problem?

Thanks-Brian

Howdy Arno and thanks for providing the links...I did take a peek at those already!

I'll take a look at the DS18B20 but I already purchased the LM34s (Fahrenheit version). I think the LM34 has a bit better accuracy yet DS18B20 is the less "painful" alternative!

I plan to:

1. look into the whole atten as that controls the voltage range to the ADC
2. look into an active low pass filter using a single supply Op-Amp
3. look into adding a small gain from the Op-Amp to get the voltage from the LM34 into an acceptable range for the ADC

Will share my findings along with any schematics I come up with.

Thanks-Brian

@kumohoshi42
Thanks for sharing how you resolved the problem!

Hi all,

Some insights to share! Well the Active Low Pass filter did help to a small degree. With that said I decided to connect my Oscilloscope to the input of the ADC0 using GP35 and I was surprised by the amount of noise!

Input of ADC0 on GP35:
There was over 200mV of noise that varied in frequency of anywhere from 18 to 78MHz!

Measuring "ground" (just as a reference)
There was less then 100mV of noise that was around 60Hz which would be expected here in North America as our AC Line Frequency is 60Hz.

I did order some other one-wire temperature sensors including the DS18B20 and have another temperature sensor with a +_ 0.25 accuracy just to experiment with.

Again I will keep this post updated.

Thanks-Brian