I bought 2 different Non contact liquid level sensors from Robotshop. I want to run a water pump to keep a container full of water. I will need one of these water level sensors to turn the pump on when the level drops. My small fountain pump is 24v and I think it pulls about 1 amp or less. My water level sensors are the RB-Dfr-396 and the other is the Rb-Dfr-694. Please tell me what relay I might need for my project. My robot does have available DC power of 5v and 12v and 24v My pump runs on 24v also which level sensor should I use? Thank you!
You can use the RB-Dfr-694 you have, interfaced with an Arduino UNO board and a relay module as the 10 A 1 Channel Arduino Compatible Relay to drive the 24V pump.
Here is a tutorial/example on how to use a relay board with Arduino.