Getting smoothieboard to work with very high resistance thermistor

Controllers Smoothie
1

Hi,

I’ve gotten myself a AZSMZ board and installed the latest smoothie firmware, which is based on the same CPU.
I’ve set up my thermistor with the rt curves.

I’m using a thermistor which has about 4 700 000 Ω at room temperature. When testing the board, I have no readings.

When I plug a 2 000 000 Ω pot, I can see the temperature rising starting at 55°C, which is equivalent to 1 700 000 Ω. Below this, there are no readings.

I was able to get it to work with ATMEL based boards, and I thought it would be easier with a 12 bits ADC. Is my problem hardware related or firmware related? I cannot see any error message when going under 55°C, only nothing.

Any help will be greatly appreciated!

Imported from wikidot

2

Hey.

For problems related to the AZSMZ, you might want to go to the seller rather than to the community.
The AZSMZ is not Open-Source and is not connected to this community, so people are less likely to be willing to help.

Hope you’ll figure out your problem.

Cheers.

3

Hi Arthur,

I first wanted to get a SmoothieBoard, but it seems like the supplier Uberclock has been out of stock for quite some time. While searching on the net, I couldn’t find anything that would offer a great deal plus shipping. This is why I have chosen the AZSMZ board.

Also, I have a ZASMZ_mini which seems to be open-source: reprap org/wiki/AZSMZ_Mini

Regards,

4

Hey.

Yeah, Uberclock has been out of stock recently. They are back in stock now I think. You can also get boards at the hackaday store, robotseed, and a few other places.

The AZSMZ mini isn’t open-source : the reprap wiki admin have tried to get them to clarify the situation about the license, and it’s been a mess. When they didn’t release the files, they said it’s GPL, but when they released the files they attached a non-open-source license. They essentially don’t want the board to be open-source, but try to make it look like it is so it can be on the Reprap Wiki ( which is a very good source of traffic ).

About your problem : do you have the most recent firmware version ? Have you tried another thermistor input ?

Cheers.