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Hey guys,
I want to measure the internal temp of my jianken ATC spindle. I have a NTC with a classic voltage divider setup, and at room temperature the V_out of this divider carries 12V. (Measured against GND with a multimeter).

However, as soon as I put this cable into analog_in1 of my Mesa 7i76eu, the voltage drops to 8v, and thous the calculated temperature is garbage...

Any ideas why this is happening? 

regards
Sebastian

 

 

Note that the pins listed in the source file comments are DB25 pins

so

7I90  P4.1  --> DB25.1
7I90  P4.3  --> DB25.14
7I90  P4.5  --> DB25.2

etc

Thanks a lot for the explanation! I will try this solution.

Hi thanks for your answer. Yes i saw your Macros and i think they look really good. You did and do a great jobs there for all, thank you for that! But as far as i understand them, you can only use one at a time right? and there is also no macro for a free contur ? or do i miss something? 

edit: oh sorry my bad, they are from andypugh of course! so thanks andy

Note that this is not a standard configuration as the 7I90 is a 50 pin connector FPGA card
and the 7I85S is s 25 pin FPGA card daughtercard. I pinned this out so a flat cable adapter
should be relatively simple (look at the included VHD source file for the pinout)

 

This has 3 stepgens and 1 PWMgen, 4 encoders and a sserial port
(on the 7I85S)