I am building a seismograph with a coil that generates some current when a magnet is oscillating above it.
This is my current setup and works OK but probably needs improvements. I have around 50 units delta between lowest value and the highest after ADC.
I want to improve it, possibly by
- filtering out frequencies above 10Hz,
- better AD resolution
- and less noise when idle / be able to see smaller signals.
What can be done about the first item? The current circuit is pure experimentation, it takes time to charge the caps and get the middle V but that is fine.
I ordered 24bit ADC ASD1232 for the second item and plan to use a better quality regulated 5V power supply as replacement for USB power to reduce noise.
Is it better to provide separate power supply for ADC circuit/module or just clean 5V to the Arduino will produce clean 1.1V for V-ref too?