DIY soil moisture sensor at home

DIY soil moisture sensor at home

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Constructions in the country, which work automatically, can simplify the life of the owner. An automatic irrigation system is installed in order not to do the monotonous hard work. In order to prevent an excess of water, it is worth installing a soil moisture sensor - it is not difficult to make such a structure with your own hands.


  • What is a humidity sensor?
  • Why is this device needed?
  • What is needed to make a sensor with your own hands?
  • Step-by-step manufacturing instructions
  • Application features

What is a humidity sensor?

A humidity sensor is a device that consists of two wires. They are connected to a weak energy source. If the humidity between the electrodes begins to increase, the resistance decreases and the current decreases. If water becomes scarce, then resistance increases.

It should be understood that the electrodes will be in humid conditions. For this reason, experienced experts advise turning on the device using a key. This will reduce the negative effects of corrosion. In another situation, the entire structure is off. It is turned on when it is necessary to check the humidity. To do this, just press the button.

Why is this device needed?

The installation of moisture sensors is carried out in greenhouses and in the open field. With their help, you can control the watering time, and a person does not have to do anything for this, it will be enough to turn on the device. After that, it will work without interruption. But summer residents should monitor the condition of the electrodes, since they can deteriorate due to corrosion. Both in greenhouse conditions and in the open field, such a system will be an excellent assistant.

Such a system shows the result quite accurately when compared with other similar designs. Often, a person already thinks that the soil is dry, although the device will show a hundred units of moisture. And after the soil has been watered, these figures grow to 700 units.

If such a sensor is to be used outdoors, then it is recommended that the top be sufficiently sealed. This will not distort the indicators. For this, a coating with a waterproof resin is used.

What is needed to make a sensor with your own hands?

In order to make a sensor yourself, you need to acquire the following tools:

  1. Two electrodes. Moreover, their diameter should be about 3-4 mm.
  2. A base that was made of PCB or a material that is not afraid of corrosion.
  3. Nuts and washers.
  4. Other supporting tools will also be needed.

Step-by-step manufacturing instructions

The collection of the sensor takes place in the following sequence:

  1. Initially, the electrodes are attached to the base. The main thing is that it is protected from corrosion.
  2. After that, a thread is cut at the end of the electrodes. On the reverse side, they are sharpened to make it easier to immerse them in the ground.
  3. Holes are made at the base of the PCB. Next, the electrodes are screwed into them. To secure them, nuts and washers are used.

It is necessary to select the correct wires that fit the washers. After that, the electrodes are insulated. They go 5-10 centimeters deep into the ground. It depends on what capacity is used, what size of the beds. For the sensor to work, a current of 35 mA and a voltage of 5V are required. It depends on the moisture level.

Video about a simple humidity sensor:

Ultimately, the sensor is connected. For this, 3 wires are used, which are connected to the microprocessor. A special controller will provide an opportunity to combine the device with a buzzer. After that, a signal is given if the soil moisture is too low. In some sensors, the light changes instead of a signal.

Application features

Highlight the varied uses of the soil moisture sensor. They are often designed for automatic irrigation systems. The sensors are made in flower pots. They are beneficial for plants that are too sensitive to moisture levels in the ground. In the event that succulents are grown, then rather large electrodes are used. In this case, there will be a reaction to a change in humidity at the rhizome.

Often such sensors are used if violets or plants with fragile roots are grown. If you install a sensor, then you can know when to water. Such devices are ideal if plants are grown in greenhouse conditions. A similar sensor design method is also used if it is necessary to control air humidity. This is especially useful for those plants that are systematically sprayed.

The owners in the country can relax, since the sensor will decide for them when it is necessary to water the plants. In this way, you can find out how moist the soil is. This will protect the beds from excess moisture. There are other cases when people install sensors. They can help keep track of the moisture content of the soil in the basement. Some people install it in the sink area.

If the pipe starts to leak, the automatic design will immediately tell you about it.

In this way, timely repairs will be carried out. So, the soil moisture sensor makes it possible to create devices in various areas and zones of the summer cottage in a couple of days. It is not necessary to run for professional help, since such a design is easy to make yourself. To do this, it is enough to follow certain rules and sequence.

Watch the video: How to make a soil moisture sensor. Very simple. With few component. At home. SUMMER SPECIAL (May 2022).


  1. Jenci


  2. Tormaigh

    I'm sorry, but, in my opinion, mistakes are made. Write to me in PM, discuss it.

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