Hello everyone,
I have a project consisting of making an ADC main board with a Raspberry Pi 4B which will allow me to measure differential voltages from an analog accelerometer sensor on remote micro-boards.
The fact I cannot use a 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 sources which will then be all acquired in a synchronized way.
I will use these vibration data to get frequency response for extracting modal frequency with specialized software (using OMA - Operational Modal Analysis). If my data are not synchronized, the extraction will be biased...
My ADC has differential inputs, so my idea is this, but I don't know if it is correct? It multiplies the number of GND, and so perhaps it is a bad idea? (I have 32 sensors) Perhaps I need to connect GND to both ends in this case??
Else I can do that which is less expensive by taking power from the main board. In this case, there is only one GND, so perhaps it is better??
What do you think is better?
