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I am not currently on this project. Was disappointed and set it aside. Removing DC component with firmware I think is too difficult.

The oversampling of DT routines were tested and applied on...

I do not know if it is suitable for this project, but I had good results with Darrels Taylor ADC oversampling routines (http://dt.picbasic.co.uk/CODEX/AnalogueOverSampling).

Also Kalman filters...

It is very important to:

1. have the finger cleaned with alcohol before testing and also clean the sensor with alcohol too.
2. Not pressing hard the finger on the sensor, the shell of the sensor...

Interesting 3D print!

Ioannis

Use of such finger sensors need to have your finger cleaned from oil with alcohol (isoprop. alcohol or similar).

It is necessary for the sensors to keep working with consistency.

Ioannis

I double what Richard pointed.

Ioannis