Perhaps I am approaching this problem the wrong way.
I am desperately trying to find a way to measure humidity as a way of knowing if urin is present inside a nappy.
My daughter is 20yrs old though she has a mental age of 1yr due to a deficiency of O2 during birth. This has left her incontinent as well as other obvious challenges.
I have been looking for a method to detect urin to assist us to know when her nappy needs changing. This would be useful during the day but especially during the night.
I would use a buzzer as soon as there is urin in the nappy. We have been trying for a long time to help her use the toilet, if she/we had some information as to when exactly to react i hope we may have more success, we would like to build up a better routine. She becomes nervous when we are anxiously waiting to catch the moment and use the toilet. I realise its not preventative, but its a first step in the right direction. Wish I had thought of the a lot earlier.
We live in Germany, we have good support though unfortunately this kind of problem is dealt with by using nappies. It is a good solution but we would like to improve the situation, as u can imagine urin is just the start of the problem also we need to prevent infections.
The main problem will be "stool", she is fair skinned and gets rashes quickly and infections are a real problem. I am starting to get on in my years and worry about the future and hope i can help my daughter's future.
I want to be able to control the sensitivity of the sensor to not just catch urin. So urin will be the first step, if we could develop a routine based on the information from the measurements perhaps we could predict the moment of using the toilet more accurately.
OK - using branded devices with a CE label means they would have been tested for security too. You would not want a battery issue to add to the situation... I would definitely explore commercial offerings first and their capabilities.