LED water level gauge

Practically everyone who can even hold a soldering iron in their hands can make a water level sensor with their own hands. And this article will help you step by step, with the help of photographs, to produce a water level indicator in a tank with your own hands from simple and common parts. This device works very well and is very reliable in operation. When properly assembled from serviceable parts indicated in the nominal diagram, it does not need further adjustment, and will work immediately when the 12 volt power supply is connected. First you need to understand the water level scheme that we will manufacture.
LED water level gauge

DIY water level chart

LED water level gauge
First of all, after getting acquainted with the photo: do-it-yourself level diagram of the water level in the tank, is the preparation of parts and materials. We need a ULN2004 chip, you can buy it at a radio store or in China,at Aliexpress.The price for one chip in the radio shop and ten for Aliexpress is about equal, so choose the right one, the only inconvenience is that the package from China needs to wait about a month or more.

Details are collected


LED water level gauge
You can use signal LEDs of any color you like, with a diameter of 4-5 millimeters. The pinout of the LEDs and the microcircuit is on the diagram. The capacitor C1 needs a polar 100 microfarad 25 volts, or large parameters (which is). Resistors (resistances) with a power from 0.125 to 0.5 watts or more (the more power, the more dimensions and will not be very nice, this also applies to the capacitor. Resistors R1 - R7 with resistance of 47 lump (a little less or a little more - not critical). Resistors R 8 - R14 with resistance of 1 lump (approximately). The greater the resistance, the weaker the LED will glow and vice versa, but too little resistance can lead to the LED going out of order. A printed circuit board can not be manufactured, but a prototype, like mine, costs a penny, especially in China.The price ratio in the radio shop and China is 5 - 10 to one. You can use any eight-way signal cable to the water level sensors (there are everyone in the stores that sell alarm devices). The cable ends, placed in water as a level sensor, should be removed from the insulation for a length of 5 to 10 millimeters and tinned (polished with tin) with the stripped ends to reduce the oxidizing effect of water on the metal. The plus electrode should be made of stainless steel (for example, a teaspoon), and its junction to the wire should be protected from water with a glue gun. If the place of contact is not protected, then in a short time the electrochemical reaction will devour. The step between the sensors must be calculated based on the depth of the tank. If you need to measure a greater depth of water and you want to place the sensors more often, you can make another or even several similar schemes for monitoring the water level and place them sequentially in a tank. The design of the sensors can be very diverse and depends only on your imagination, the main thing is to follow general principles.
LED water level gauge
LED water level indicator
Any terminal block, but it is important to connect and use convenience. For the chip, it is best to use a connector for solderless placement. This nest can be soldered and not afraid that you overheat the legs, or static electricity will work. If the chip is out of order, for some reason, then you can replace it in a couple of seconds. It is worth such a penny pen. Tin (wire with rosin) is better to use Russian. Chinese tin is not good. After collecting the parts, you need to think about placing the parts on the board. I did, as in the photo, and you are free to arrange them to your liking. The main thing is that the location of the parts meet the tasks of reducing the number of jumpers and soldering, and most importantly ease of use. Accuracy in the assembly of the scheme is not the last thing, do not need to hurry as I will be all beautiful. So let's get started.
LED water level indicator
LED water level indicator
LED water level indicator
LED water level indicator
LED water level indicator
LED water level indicator
LED water level indicator
LED water level indicator
LED water level gauge
The power gauge of the water level in the tank can be made from any 12 volt battery (even an old one, so long as it gives at least 10 volts), for example, from a uninterrupted computer unit supply, and now they sell a lot of all sorts of low-power. Or you can use ordinary batteries in the country. If they are connected in series 8 pieces of 1.5 volts = 12 volts. Quite enough. And if you connect the batteries through the button so that the circuit only works when you press the button, then this power will last for many years. It remains only to test the water level indicator in the tank and the main thing here is not to confuse plus with minus. Power wires are better to connect in different colors.Plus is always marked in red, and minus black if you get used to it, then you will not confuse it.

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