FDC1004: Monitor the ink by FDC1004

Alex,

The FDC1004 is the best capacitive sensor for liquid level sensing.

You can find a comprehensive list of app notes, etc. at the E2E FDC1004 Frequently Asked Questions page.

Some of the app notes about liquid level sensing:

1. How to Calibrate FDC1004 for Liquid Level Sensing Applications
2. Capacitive Sensing: Out-of-Phase Liquid Level Technique
3. FDC1004: Basics of Capacitive Sensing and Applications
4. Liquid Level Sensing with the Immersive Straw Approach
5. Capacitive Sensing: Direct vs Remote Liquid-Level Sensing Performance Analysis

I hope this helps.

Please let me know if you have any questions.

Regards,
John