I have a pool where I need to install sensors to measure it's water level. The problem is that I can't add wires to the pool because it would involve breaking up all tiles in order to get extra wires inside the pool. That's not an option.
Luckily the pool cover motor has 1 unused wire that I can use. The cover motor works with 2 wires for power (power is reversed for open/close movements. It's working on 12V DC). It also has 3 wires that go to a hall effect sensor (to get pulses from the cover used to keep track of it's position).
So I can use the GND wire of the hall effect sensor and the unused wire for attaching my sensors.
Now the question is: can I somehow provide power over 2 wires and send data over the same wires?
If yes, are there example circuits for this?