DIY WATER LEVEL INDICATOR ON REED SWITCHES

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Simple design for determining the amount of fluid in any tank. Its huge plus is that it can be scaled to any size and vessel without any problems. For example, you have a tank with rainwater, and you want to constantly monitor the water level in it. There is nothing easier. With the help of this simple level indicator built on reed switches, you can easily implement this control system.

Need for indicator

To make a five-level indicator, you will need: five reed switches working for short circuit, five LEDs, 5 resistors per 330 Ohms. Wires, power supply, breadboard.

You will also need a pair of magnets (from an old hard drive). The tube and the float were printed on a 3D printer, but no one forbids taking a tube of polypropylene or PVC, and the float can be glued from something.

Level indicator chart

A simple circuit consists of five separate cells connected to a common power bus. Its reed switch turns on its LED.

The idea of the water level indicator is that reed switches are located along the entire length of the tube. This design is immersed in a container of water. A float with magnets walks along the tube. And at what level he swims, those reed switches and close. Closed reed switches include LEDs and information is displayed on the LED bar.

Making a level indicator on reed switches

It is necessary to make the sensor itself - this is a wire on which reed switches are located after a certain distance.

This wire is inserted into the tube, which is sealed from the bottom, and a bundle of wires connected to the board comes out from above. Then we put on a magnet float, connect the power. And our level is ready.
In work, it looks like this:

The length of the measuring tube of the sensor can be any other. Since the number of measurement cells.
Another important plus is that the system is tight and the voltage does not touch the liquid in any way.
Original article in English

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