Originally Posted by
awpross
The MK3 is equipped with analog inputs, but I have some problems using them.
I know it is easy to use a poti, connected to GND and 3,3V and connect it to AUX2 for example. But in my situation I have a infrared temparature sensor which has an analog output 0-10V.
So i thougt would be easy: Using two resistors to create a voltage divider between the 0-10V signal and GND to get an voltage output of 0-3.3, but it looks like I have some problems with the voltage reference and even if i directly connect the 0-10v to AUX, i can not use the full range of the AUX input.
Measured to ground I have had 3.3v on the AUX, but the display showed only a low value. Connecting the AUX to the onboar 3.3v, it shows maximum value. That's why i think the AUX may have a internal voltage reference which is not directly related to the GND or the Infrared sensors 0-10V output has some unknown behavior.
Is somebody using the AUX in for 0-10V measurement and can suggest how to connect it properly?