I am hobbyist only with some basic idea about electronics..
I am trying to measure rooftop watertank water level and to display it on a small led bargraph. So by googling I thought about to proceed with ULN2003 darlington array.
But my challenge is it's little far from tank to the bargraph at room. So taking 7 wires from rooftop is not sounds to be a good approach. Is there is any encoders or something like that to convert this 8 output (in my case 6) to a single serial output and to decode it?
I thought about shift registers but it does require some mcu to control it and also some voltage restrictions.
So which is the best way.
I have one more confusion, which is the best metal to use as an underwater probe. Or how can I eliminate the risk of corrosion or oxidation issue after some period.