Thank you so much for your answer.
Here is my schematic
Basically, i have 4 interdigited electrodes. The user will sample a liquid to electrodes in different times. For example, the liquid comes to first electrode might be tomorrow at 14:22, to second electrode might be 14:23, to third electrode might be 14:25 etc. I have to get the time informations of them and send the data via NFC.
The thing is that the system might be given to user after 5 months since it was produced. When it was produced, it will start to consume power from 3V coin cell battery and i want to use it at least 4 months.
The sampling time is not certain, it will be given to a user maybe after 2 months since it was produced. But it is possible to arrange a initialization method to indicate that it was given to user and start to work. However, after giving the system to user (after initialization), the system should check the ADC values that it gets from electrodes because when the liquid will come is unknown.
I was thinking that, is it possible to wake up the system when the ADC value of first electrode changes ? Up to that time, the system will sleep but needs to check the ADC values.