Hi to all! I have some doubts about the use of a digital potentiometer in a wheatstone bridge. I have to realize a conditioning circuit to amplify the signal of a strain gauge so I want to set to zero the output of wheatstone bridge using a digital potentiometer by SPI (Serial Peripheral Interface) with a microcontroller. I know that the POT can be put in a branch of the the bridge or in parallel as you can see in the attached schematics.
But I don't know what are the advantages and disadvantages by using one of these configurations. Consider that one of resistors of the right branch (R3 or R4) or both are strain gauges.
Thank you and sorry for my bad English!
But I don't know what are the advantages and disadvantages by using one of these configurations. Consider that one of resistors of the right branch (R3 or R4) or both are strain gauges.
Thank you and sorry for my bad English!