Guyzz in my new summerhouse , the "Ground water" is sometimes rising in the cellar. Maybe as much as 30 cm.
Until i get drilled a Hole in the concrete , and put in a pump (Next year) , i would like to measure the waterlevel.
How do i best do that with a M168 , 10 cm indicators ??
I was thinking about something like making 4 small pcb's , and connect GND and a portpin to each , via a 470 ohm resistor (the cable is prob going to be 3..4 meters long).
Then activate pullup on the portpin , and read the port.
If i get a zero reading , the pcb is "shorted"
Would that work ?? , or should i use some A/D stuff or ????
The cellar is made of big granite stones in concrete , amd might etch the pcb. But it should be a "cheap" solutuion.
Any suggestions are welcome