Posted on Feb 7, 2014

The input range of the USB-DUX sigma board (+/-1. 35V) matches perfectly the output voltage range of the LM35. GND is available on many pins on the HD connector (check out the pinout ) so that you can choose the ones which are easiest to solder to. R5 should be soldered close to the D con

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nector (e. g. inside of the backshell) which acts as a termination and prevents oscillations. To be able to measure negative temperatures connect a 100K resistor between pins 16 and 31 (-5V).

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