im looking for the right hardware to build an fill level checker for my cistern. the idea is to do it with ultrasonic sensor HC-SR04. but i dont want to put my raspberry in the cistern.
the distance between the house and the cistern is 10m.
it should be cheap and with low power consumption.
i do have no expierence with arduino nano or similar.
im happy for any ideas or tutorials.
thanks a lot.