Hello everyone,
I have a project consisting of making an ADC main board with a raspeberry PI4B which will allow me to measure differential voltages from a analog accelerometer sensor on remote micro-boards.
The fact I cannot use digital accelerometer is that I cannot synchronize them and so my vibration data will be delayed each with other... It is why I must use multiple analog souce which will then be all acquire in a synchronozed way.
I will use these vibration data to get frequency response for extracting modal frquency with specialized softwaez (using OMA - Operation Modal Analysys). If my data are not synchronized the extraction will be biased...
My ADC have differential inputs so my idea is this but I dont know if it is correct ? It multiply the number of GND and so perhaps it is a bad idea ? (I have 32 sensors)
Also, is it a problem that differential signals are not referenced by the GND in the main board ?
Perhpas I need to connect GND to both ends in this case ??
Else I can do that wich is less expensive by taking power from main board. In this case there is only one GND so perhaps it is better ?
What do you think is better ?
