Internet-controlled greenhouse automation. Thermostat for greenhouses - Medium complexity constructions - Schemes for beginners. Channel operation modes
The idea to make an automatic greenhouse came to me for a long time. It came to implementation and I began to study the greenhouse economy and the automation device for greenhouses. It turns out that an intelligent greenhouse is not so simple, there are a lot of subtleties that have to be taken into account. I'll probably start with the main thing - how the growth and maturation of different crops occurs and what environmental parameters should be maintained during these periods.
Air temperature
If tomatoes and cucumbers will grow in the greenhouse, then the environmental parameters for these crops are similar. Tomatoes feel good at air temperatures from +18 to + 25 ° С during the day and not lower than + 16 ° С at night. Soil temperature from + 10 ° С and above. For flowering and fruiting, the temperature can be increased slightly so that the fruits ripen faster and are larger.
At night, substances from the leaves go to the fruits. If the temperature is increased, the fruit will pour more actively. If the temperature is in the lower limits, then this promotes the growth of shoots and roots - for long-term fruiting.
To maintain the desired temperature in the greenhouse, seasonal temperature fluctuations in the area where the greenhouse is located must be taken into account. If this is the southern part of Russia, then you can focus on automatically lowering the temperature, and if the northern part of Russia, then you will also have to take care of the heaters.
So I'll start about ways to lower the temperature in the greenhouse. The easiest way to lower the temperature in the greenhouse is to create ventilation. For ventilation, "actuators" are used, which open the vents when the temperature rises.
There are autonomous "oil ventilators" - the essence of their operation is simple, when the air temperature rises, the hydraulic oil expands and pushes the stem, thereby opening the window. When the temperature drops, it closes without any automation. But there are problems with them, the first problem is that if the air temperature is high and a cyclone suddenly flies by with an increase in the wind, the window may simply not have time to close and it can be torn off by strong wind currents. Well, the second problem is cylinder leakage, but this can be noticed in time.
Greenhouse actuators
I decided to make the airing more intelligent. The shops sell linear actuators that can be used to open and close the vents according to specified conditions. Because the automation always works, the ventilation can be connected to the general system, because the actuator does not cost more than the hydraulic cylinder and the possibilities are much greater. Combined with a wind sensor, barometric pressure sensor and temperature sensor, you can expand the capabilities of your greenhouse. For example, an atmospheric pressure sensor can monitor pressure drops, because it has long been known that with a rapid drop in atmospheric pressure, a strong wind is more likely to pass, and already the wind speed sensor will definitely show that all the vents should be closed.
Air humidity
This is the same important parameter in the greenhouse as the temperature, it should not fall below 60%. For different crops, this parameter can vary from 60% to 90%. Moreover, the parameter of air humidity changes depending on the stage of growth, flowering and fruiting. Therefore, in the automation for greenhouses, it should be possible to change the conditions or choose already established programs for different crops and stages of growth.
Ways to humidify greenhouses
To humidify the air in the greenhouse, humidifiers and humidity sensors are used, these can be ultrasonic humidifiers or high pressure nebulizers. Reverse osmosis filters should be used for ultrasonic humidifiers, because the piezoelectric element will quickly become unusable from the sun and other deposits. But the nozzles of the high-pressure sprayer also clog up, so a fine filter is needed.
For ultrasonic humidification, one fact should be taken into account, with ultrasonic humidification, the steam temperature is almost 40 degrees, i.e. when humidified, the overall temperature in the greenhouse will rise slightly. But ultrasonic humidifiers are an economical option; of course, it is better to use a high pressure pump and special spray nozzles.
Soil moisture and watering
Another important parameter for greenhouses is soil moisture. At different stages of growth and maturation, this parameter changes. The greatest need of plants for moisture during the seedling period is up to 90-95%, as well as in the phase of fruit formation and fruiting.
Automatic irrigation systems
Automatic irrigation in a greenhouse is arranged differently, but in the end everyone comes to metering irrigation. Soil moisture sensors can be used but with drastic modification. Chinese printed circuit board humidity sensors can show accurate data for no more than a month, after which the metal surface of the contacts disintegrates and oxidizes. If you use this sensor, then in the end the moment will come when you go into the greenhouse and you have a pool there, everything is flooded and your plants will probably die. Therefore, humidity sensors can be used in conjunction with a water flow sensor (water meter). It is necessary to measure the amount of water consumed per day and set this parameter. The soil moisture sensor can be used, but with modification, the contacts should be made of a material that conducts electric current and oxidizes as little as possible. It may be copper, but it also oxidizes with time, but this is already good, because you can clean the contacts once a year and use them again. But it is better to try graphite rods, graphite conducts electric current and does not oxidize. I have not tried it yet, but I would like to make such a sensor for the test. In general, you need to take the water meter readings as a basis, and you can turn off watering with a humidity sensor if it shows the maximum values. For example, in rainy weather, the water consumption decreases several times, and the set amount of water for the flow sensor can be too much. So it is better to make the control for irrigation combined.
Watering is switched on using a relay by a signal from a sensor or by time. The container for irrigation should be at a height and it is better to do watering by "gravity" simply by opening or closing the solenoid valve. Thus, you can make a more autonomous system, because to power the controller and valves, a conventional battery and a solar battery are enough. This principle of irrigation will be appropriate in places where electricity is often cut off for a long time.
Soil temperature
Soil temperature is also important to regulate as Keeping soil temperatures within certain limits will help expand the capabilities of your greenhouse. For example, in this way you can extend the greenhouse usage time from early spring to late autumn, and grow some exotic plants. Temperature control in an automatic greenhouse can be done with heating shades. Stores sell heating wires that are placed on the bottom of the beds. Heating is controlled through a controller that constantly reads data from a temperature sensor, which must be in the ground. Those. the temperature sensor must be waterproof. When the temperature is lowered, the controller will give a relay signal to turn on the power for heating. Once the soil temperature reaches the preset limits, the controller will disconnect power from the heater. To prevent the heating element from breaking down from frequent switching on and off, it is better to use special dimmers that will gradually apply a load to the heater.
Greenhouse on arduino
Greenhouse equipment
- Arduino Mega controller - aliexpress $ 10
- Relay box 8 channels - price on aliexpress $ 10
- DHT Temperature Sensors - aliexpress $ 1 price
- DS1820 Temperature Sensors - aliexpress $ 1
- LCD I2C data display module - price on aliexpress $ 3
- Soil moisture sensors - aliexpress $ 1 price
- Light sensor - price on aliexpress $ 1
- Electro magnetic valves for drip irrigation - 150 rubles apiece in a car shop
- An uninterruptible power supply unit for 12 volts without a battery - 700 rubles, with a battery of 2000 rubles.
- Electric door lock drive for a car (for a window) - 250 rubles in a car shop
- Float water level sensors - 200 rubles
Management of electrical loads
To control electrical equipment, a Relay Shield board is suitable, the number of relays must correspond to the number of devices + a margin for the future, you can always add. The picture shows a 4-channel board. We will turn on / off the pump, electromagnetic valves. If you use a servo or an electric door lock for a car, you can open / close the vents.
Environment parameters
Environmental parameters are read in the greenhouse using temperature and humidity sensors. This data can be used for ventilation. Lighting control
You also need a photoresistor that will turn on the lighting. Autowatering
A moisture sensor is needed for timely watering if the earth dries out. But autowatering should be regulated by several sensors, because the beds are usually long and the sensor will not be able to show accurate data for the entire area. Timer
For additional automation schemes, you should get a clock board for arduina. For watering, it is worth using a timer in conjunction with an air humidity sensor. You can do a lot with the timer, and if you also use the calendar, you can increase or decrease the illumination interval depending on the requirements of plants of different crops Access to the greenhouse via the Internet
If you don't want to limit yourself to only the offline version of the automatic greenhouse, you can buy a special network shield for 10 bucks on the same aliexpress, so that you can control the greenhouse via the Internet. We can also use the network to connect video cameras. You can follow our plants over the Internet. Alarm SMS notification
I don’t want to get ahead of myself, but a thought came to my mind. For example, if water is not pumped into the tank, the pump is clogged, or the window is jammed and the temperature in the room rises above 80 degrees, all this can lead to the death of plants. If we live in a dacha, then we can once a day look into the greenhouse to see if everything is in order with the plants. But what if we are in another city? I think we need to make a security algorithm to check the boundary parameters of the greenhouse. If one of the parameters is approaching a critical point, you can send SMS using a GSM shield for arduiono, it costs about 50 bucks for aliexpress. We will always be in the know if our plants are uncomfortable and we can call a neighbor to check if everything is in order with the greenhouse. Airing
There are several ways to maintain optimal temperatures. For greenhouses, the optimum temperature is +22 degrees, the maximum is +30 degrees and the minimum is +16 degrees. To begin with, we will use an oil thermal drive, I don’t know the price. a specialized one costs from 1,500 rubles, but you can make it yourself from an old automobile shock absorber and additional capacity for better expansion. In general, the idea is this, when the temperature in the greenhouse rises, the oil in the cylinder of the thermal actuator expands and pushes the piston, which is connected to the window, thereby opening. Conversely, as the temperature drops, the thermal actuator closes the window. If everything is calculated correctly, then electronic devices for maintaining the temperature are not needed, but we will make a fully automated greenhouse in case of extreme heat. And we will add more fans that will turn on if there are not enough oil thermal drives. Watering
We have already read a lot about growing plants in a greenhouse, which is why watering is also dynamic, and maybe adapting to certain plants. We get the basic data for watering from moisture sensors, but it happens that it is necessary to specially do a special watering on a timer at the time of maturation or growth. To do this, we will write a script for a specific type of plants, but in the main we will use a moisture sensor. A large barrel is used for irrigation, it is better to have a dark color so that the water heats up in it, you cannot water it with cold water. The barrel is placed high so that there is a little pressure. A valve is connected to the barrel, which lets water into the dropper system. For complete control, it can be divided into sections with valves so that they do not overflow or underfill in different places, and use its own humidity sensor for each section. Two water level sensors (minimum and maximum) must be embedded in the tank. According to these sensors, the pump will fill the barrel if there is little water and turn it off if the barrel is full of water. We bring it all to life with the program
As we come up with the exact scheme of automation, we can start programming sketches. The writing of the program is based on the C ++ programming language. On the Internet, you can find many examples that you just need to adjust to your tasks and change the numbers. At first, you will need to adjust the parameters and almost manually configure everything, and debug in the process, so you will have to constantly monitor and adjust. It usually takes a couple of days, one for setting up the second for checking, but it would be better for the first time to constantly be aware of what is happening in the greenhouse, otherwise the sensor may not be there and react poorly to changes. But then, when everything is fine-tuned, it will be possible not to worry about the microclimate in the greenhouse, and just pick fresh vegetables and berries from the beds. Arduino programming is not difficult, there are many examples on the Internet. This activity can be called a construction set for adults, fun and rewarding. The only thing I would like to say to all this is that arduino can solve everything, but for use on an industrial scale or for high reliability, it is questionable. For reliability, it is better to use ready-made devices, although Arduino has been working for me for several years without problems.This article is not just a list of instructions for repeating my smart greenhouse, I tried to make a real presentation of greenhouse automation to inspire you.
I wanted to make such a smart greenhouse on a microcontroller with my own hands, in which the plants would not dry out without supervision for several days. The two main factors in the life of plants in the greenhouse are water and temperature, so the emphasis in the control scheme was placed on these factors.
Brief description of the system:
Rainwater is collected from the roof and stored in tanks. A submersible pump is installed in one rain tank. It pumps water into a make-up tank in the greenhouse. The feed tank contains 7 pumps that directly water the plants.
All plants are planted in pots, each of the seven pumps is connected to four pots. In each group of four pots, one contains a soil moisture sensor that transmits data to the Arduino module. In the application on my phone, I can set the humidity level at which these four pots will be automatically watered.
The greenhouse has two temperature sensors. If it gets too hot, a fan turns on, supplying cool air from outside to the greenhouse (there are also automatic ventilation vents in the roof of the greenhouse). If the temperature drops too low, a small heater inside the greenhouse starts to work to prevent the plants from freezing.
In the following paragraphs, I will explain the main points of how different parts of the system work.
Step 1: rain tanks
I have two rainwater collection tanks connected to a drain. The tanks are equipped with automatic overflow protection, which requires setting the filling level. The tanks are connected to each other by a hose, thus, a siphon spillway is carried out between them in order to achieve the same water level in both tanks.
The tank closest to the greenhouse has a submersible pump and an ultrasonic sensor that measures the distance to the water surface. They are connected to an Arduino module in the greenhouse and send data to my phone. Measuring the distance to the surface will also prevent the pump from turning on if the water level is below the water intake.
Step 2: make-up tank
The pump supplies water from the rain tank to the make-up tank in the greenhouse. It has seven pumps from cheap windscreen washers. An ultrasonic sensor monitors the level of the tank filling, I set the limits of 50% and 75% for automatic mode. Filling takes place from a rainwater tank.
Pumps 1-4 are connected to groups of four pots, pumps 5 and 6 are spare, and pump 7 is connected to a humidifier head. I did the latter as an experiment, pursuing the following goals: the first is to cool the air, and the second is to increase the humidity, which cucumbers really like.
Step 3: Potted soil moisture sensors
Soil moisture sensors collect and send data every half hour. The set value and data from the sensors are reflected on the phone screen, from the phone I can also change the settings.
Step 4: Turbulent Potted Rack
Hoses run from the pump to turbulent struts in four pots.
Step 5: fan
The fan operation depends on the set value in the telephone and is controlled by a PWM (Pulse Width Modulator), depending on how much higher the actual temperature is than the set values.
Step 6: temperature sensors
To measure temperature, I installed two DS18B20 single-wire sensors, one at the top and one at the bottom. Data from them are transmitted every ten minutes. Depending on the reading, I turn on the fan or heater.
Step 7: humidifier
Spray nozzle to increase air humidity and cool down if the fan fails.
Step 8: Arduino control system
Now I will not give a control program for the Arduino, while attaching a photo of the connection of the board with various relays and others like them. This kind of wire mess is caused by the changes I made after each test.
Step 9: Blynk interface
I am attaching interface pictures for the automation of the greenhouse. It is made with the Blynk app.
First picture: shows indication of low water level in tanks or signal error. In both cases, I stop the pumps. And also a graph of the history of data on water levels in both tanks.
Second picture: temperature monitoring data, also with data history graph. Here you can see the set values \u200b\u200bfor the maximum and minimum temperature in the greenhouse. The average temperatures are shown along with the percentage of fan power when the temperature exceeds the set values. You can also see if the heater is working.
Third picture: data from soil moisture sensors and setpoint for watering start. Countdown to the next measurement, interval 30 min. Measurement history graph with readings obtained.
The fourth picture: the ability to control the operation of the pumps directly from the phone, mainly for debugging purposes. Also here I can switch parts of the system to automatic mode. And set the duration of watering sessions.
Pumps Auto: The rain tank pump and the make-up tank pumps go into automatic mode, that is, water fills the make-up tank and plants are watered.
Watering 13:00 (watering 13:00): in automatic mode, plants are watered once a day, at 13:00.
Cooling Auto: The fan is in automatic mode and will start running when the temperature rises above the set value. The higher the temperature rises, the higher the fan power.
Heater Auto: The heater is in automatic mode and will start operating as soon as the temperature drops below the set value. The hysteresis is 1 °, that is, the heater will turn off as soon as the temperature exceeds the set value by 1 degree.
The article describes the hardware implementation of the microclimate control system in the greenhouse. This system is part of a real home garden. With its help, the process of growing plants has become partially automated, which does not require the constant presence of a person.
A specific instance of this system is being worked out on a frame-glass greenhouse, 6 meters long, 3 meters wide, 2 meters high. The greenhouse has one door and 2 vents, electricity and running water. The water is heated in a 70 liter container. The pressure in the container is about two atmospheres. About 35 plants are grown in the greenhouse.
The system looks like this:
Figure 1. Scheme of the microclimate control system in the greenhouse
The central place in the system is occupied by the Arduino Mega board (in Fig. 1-1):
Figure 2. Arduino Mega
Arduino is a completely open board and development environment that implements a revised version of the Processing / Wiring language.
The hardware platform used is based on the ATmega1280 microcontroller.
This system employs 8 digital inputs / outputs (there are 54 of them on the platform) and 10 analog (there are 16 of them in total). The board is powered by an external power supply.
The board has the following characteristics:
- working voltage: 5V;
- recommended input voltage: 7-12 V;
- limit input voltage: 6-20 V;
- 54 digital I / O ports;
- 16 analog inputs;
- consumption current at one output: up to 40 mA;
- current consumption of 3.3V output: 50 mA;
- flash Memory: 128 KB, of which 4KB is used by the bootloader;
- RAM: 8 KB;
- non-volatile memory: 4 KB;
- clock frequency: 16 MHz;
- size: 75x54x15 mm;
- weight: 45 g;
The required sensors and modules are connected to the Arduino Mega.
Watering on / off depends on a number of parameters:
- soil moisture;
- water temperature;
- times of Day.
This system employs 4 soil moisture sensors (in Fig. 1 - 2).
To measure soil moisture, a homemade sensor is used, which consists of two nails and a resistor. The principle of operation is based on the dependence of the electrical resistance of the soil on its moisture content.
Nails inserted into the soil at some distance from each other act as probes between which the resistance is checked. The resulting analog signal can be used to judge the degree of humidity.
The sensor circuit is shown in the figure:
To measure the water temperature, an LM335Z -analog temperature sensor is used (thermostabilitron, in Figure 1 - 3):
Figure 4. Analog temperature sensor LM335Z
The sensor used has the following characteristics:
- range: -40 ... + 100;
- accuracy: 1 ° С;
- dependence: 10mV / oC.
A 2.2 kΩ resistor is required to connect the sensor to the board. Setting the current through the sensor in the range from 0.45 mA to 5 mA (resistor R1), we get the voltage across the sensor, which in tens of mV represents the absolute temperature in degrees Kelvin.
The connection diagram is as follows:
In order to turn on watering only in the dark, 2 Light Sensor-BH1750 light sensors are used (in Fig. 1 - 4):
This sensor is used to measure illumination in the range from 1 to 65535 lux.
It has the following characteristics:
Supply voltage: 3-5V;
Resolution: 16 bit;
Dimensions: 19x14x3 mm;
Accuracy: ± 20%.
The sensor is connected as follows:
Figure 7. Connecting Light Sensor-BH1750
When the readings from the sensors meet certain conditions (it differs for each plant species), watering is turned on. A solenoid valve is used to regulate irrigation. It is connected to the board using a relay (in Fig. 1-5). Namely, a relay module is used for Arduino projects Relay Module 2 DFR0017. It uses high quality Omron G5LA relay. The relay output status is indicated by an LED. This module is controlled by a digital I / O port. The contact switching time is 10 ms. Like sensors for measuring soil temperature and moisture, the relay module is connected to the control electronics via three wires:
Figure 9. DHT11 Temperature Humidity Sensor
In addition to irrigation, this system also controls the air temperature in the greenhouse.
The DHT11 Temperature Humidity Sensor is used for simultaneous measurement of air temperature and humidity (Fig. 1 - 6).
They are connected to the control electronics through three wires: power (Vcc), ground GND) and signal.
On the board, in addition to the sensor, there is a microcontroller, in the memory of which the calibration corrections for the sensors are stored. The signal from the device is transmitted digitally over the bus. This allows data transmission over a distance of up to 20 m.
This sensor has the following characteristics:
- supply voltage: 5 V;
- temperature range: 0-50 ° С, error ± 2 ° С;
- humidity: 20-90%, error ± 5%.
To adjust the air temperature in the greenhouse, two modes are used: passive and active ventilation. Passive ventilation is the opening / closing of the vents, and active ventilation is the switching on / off of the fan.
The vents are opened using two (one per window) Futaba T306 MG995 servos (in Figure 1 - 7):
Figure 10. Servo drive Futaba T306 MG995
The servo used has the following characteristics:
- operating speed: 0.17s / 60 degrees (4.8V no load);
- torque: 13 kg-cm @ 4.8 V;
- moment: 15 kg-cm at 6 V;
- operating voltage: 4.8 - 7.2 V;
- wire length: 300 mm;
- dimensions: 40mm x 19mm x 43mm;
- weight: 55 g.
The data received from the sensors is written to the SD memory card (in Figure 1-8). In the future, they are processed, analyzed and on their basis graphs of various readings are built. For this, the DFRobot SD card module is used:
Figure 11. SD card module
The fan is connected in the same way as the valve is connected (via a relay module).
Cultivation of crops in protected ground conditions involves the organization of a certain indoor microclimate. Otherwise, the greenhouse becomes not only of little use, but can also cause irreparable harm to the seedlings. You can provide the plants with the necessary conditions on your own. But, more convenient and efficient will be the automation of processes that affect the climate inside the greenhouse. How you can automate a greenhouse using ready-made and home-made devices - read the article.
Modern devices for the automation of greenhouses and greenhouses allow irrigation, heating and ventilation systems to operate independently. Today, there are several ways to automate processes that depend on. Each of them has its own advantages and disadvantages.
Automation in greenhouses differs in the principle of operation (the method of bringing the mechanisms into action) for:
- Electric... Such automation is characterized by ease of installation and the ability to fine tune. The disadvantages of electrical systems include their high cost, compared with other types of automated systems, and dependence on the source of electricity.
- Hydraulic... Such technologies are reliable and absolutely safe: they are based on the principle of liquid expansion during overheating. Disadvantages of designs - slow response to a decrease in temperature.
- Bimetallic... Bimetallic devices are based on the ability of various metals to expand. Such systems are ideal for the automation of ventilation systems. The disadvantage of bimetallic automation is that it is not capable of driving heavy equipment.
The above automatic systems can be installed on any equipment that needs autonomous operation. The choice of automated structures depends on the gardener's budget, the presence of a power transmission network near the site, and the size of the greenhouse.
More about automation for greenhouses in our material:
Microcontroller-based greenhouse automation
Greenhouse automation is possible thanks to precise sensors that read the temperature, humidity and light levels inside and outside the greenhouse, timers that transmit information to a special controller. After that, the control system, based on the algorithms built into the program, evaluates the readings from the sensors and makes decisions on whether to turn on or off the greenhouse actuators.
It is the program regulator that drives the irrigation system pump, the fan and the vent door closer, lighting and heating devices. Today, there are many controllers whose main task is to regulate the microclimate in the greenhouse. The price for the controller depends on the number of analog inputs and device memory. The most affordable is the Atmega controller on the Arduino platform.
More information about the smart greenhouse based on the Arduino chip can be found at the link:
The microcontroller-based greenhouse automation program is focused primarily on processes such as:
- Setting the set temperature and humidity.
- Turning on, off lighting devices, depending on the time of day and year.
- Control of the aeration system (opening and closing the vents, starting the fans when the air in the greenhouse overheats).
- Irrigation system control depending on the stages of plant development.
Such automation allows you to achieve maximum results when growing even the most fastidious crops, but it has a high cost, therefore it can be profitable only on large and industrial agricultural facilities.
Greenhouse curtain system
In large industrial greenhouses, to normalize the microclimate, greenhouse curtain systems are also used. In the domestic economy, such systems show no less high efficiency.
The curtain system provides shading to the greenhouse, reducing the chances of overheating the greenhouse due to solar radiation in summer.
There are side and top screens of curtain systems. At the same time, there are several types of canvases that perform different functions: complete or partial darkening, saving heat energy, keeping artificial light inside the greenhouse.
Often, to control the curtain system, they use centralized control from a single automatic microclimate control system in the greenhouse.
If necessary, the Screen activates a switch on the automation cabinet. In addition, the system can be included in a general controller program for controlling the climate inside the greenhouse.
Homemade automatic greenhouse
To avoid financial costs, automated systems can be completely or partially made by hand. Of course, in order to create automation on the controller, you will need thermostats, cyclic and daily timers, a finished board circuit, and communication channels with equipment. It will be much easier to organize automation for each separate process.
Most often, the irrigation system in the greenhouse is separately automated. The organization of the system depends on the dimensions of the panic. So, for small household greenhouses, a homemade drip irrigation system is often used.
The organization of drip irrigation has the following stages:
- Development of an irrigation scheme taking into account the individual sizes of the greenhouse.
- Preparation of materials (drip hoses, water tank, filters, taps, connecting fittings, main pipe).
- Installation of the tank at a height of 0.1-0.2 cm, installation of filters for water purification.
- Layout of the main water supply system and branch lines.
- Installation of shut-off valves on each branch.
- Connection of all components of the water supply using connecting fittings.
- Installation of droppers.
- Filling the tank with water.
The semi-automatic irrigation system includes irrigation by the method of solar distillation, in which water, evaporating from the reservoir, condenses on the bell, and flows down to the plants through special gutters.
Installing the machine in the greenhouse: thermovent for ventilation
The easiest way to control the temperature in a polycarbonate greenhouse is to install automatic vents for ventilation. Most often, an automatic vent is equipped with a thermal actuator that activates the device when the temperature inside the greenhouse changes.
The principle of operation of the thermovent is based on the ability of oils to expand when heated. In addition, the thermal drive can be set to the desired temperature for automatic ventilation of the greenhouse. Expert advice will help you to choose an automatic vent opener:
The automatic mechanism is mounted on windows or transoms that do not have a large windage. The opener is installed inside the greenhouse, at the top of the openable structure. For its installation, you only need a screwdriver and self-tapping screws. The thermal actuator can also be mounted on greenhouse doors.
Equipment: automation for greenhouses (video)
Greenhouse automation is a modern, convenient way to increase productivity in a greenhouse. All processes in automated greenhouses take place without human intervention, which is an indisputable advantage for gardeners, whose garden plot is located far from their permanent place of residence. Equipping the greenhouse with automation, you will stop worrying about how not to forget to open the window, turn on the lighting and heating devices in the greenhouse: the “smart” system will do everything for you, creating the most optimal conditions for the growth and fruiting of the crop!
Vitaly
Arduino greenhouse controller
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261
Vitaly
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261 Address: Bryansk
Investments:
Last Edit: 10/20/15
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261
Vitaly
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261 Address: Bryansk
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261
Vitaly
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261 Address: Bryansk
Last Edit: 10/21/15
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261
Vitaly
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261 Address: Bryansk
Registration: 11/03/13 Messages: 651 Acknowledgments: 766
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261
Vitaly
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261 Address: Bryansk
Last Edit: 10/21/15
Registration: 10/20/11 Messages: 1.177 Acknowledgments: 570
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261
Vitaly
Registration: 06/23/13 Messages: 5.837 Acknowledgments: 6.261 Address: Bryansk