Overview. The LM393 comparator will compare the sensor output value and the threshold value and then gives us the output through the digital pin. You can make this corrosion resistant by applying some kind of glue or any other material which can cover the exposed edges of the capacitive soil moisture sensor. A soil moisture sensor, also called a hygrometer, measures the amount of moisture, or water, in the soil. At first, we need to connect the Sensing Probe to the Sensor Module circuit using the jumper wire and enter the props into the dry soil. A Soil Moisture Sensor has many applications, especially in agriculture. This sensor can be connected in two modes; Analog mode and digital mode. eval(ez_write_tag([[336,280],'circuitstoday_com-medrectangle-4','ezslot_6',109,'0','0']));The Module also contains a potentiometer which will set the threshold value and then this threshold value will be compared by the LM393 comparator. Arduino NANO. Just remember you can only draw 1A from the 5V supply so if you need a few sensors that will work but there is a limit before you start over drawing current. CircuitsToday.com is an effort to provide free resources on electronics for electronic students and hobbyists. A mini submersible water pump. The components and tools used in this project can be purchased from Amazon, the components Purchase links are given below: Capacitive Soil Moisture Sensor V1.2: https://amzn.to/37OGxt5, Two-channel Relay module: https://amzn.to/2V9jF4R. On the right side you can see there is a two channel relay module. 5. Circuit Diagram: Here we just replaced the arduino with ESP8266 nodeMCU, you can use wemos D1 or ESP32 in place of nodeMCU. The relay coil has a resistance which you can measure using a digital multimeter. Thanks! 4) now connect the soil moisture sensor pins to arduino and lcd display. The capacitive soil moisture sensor allows you to measure the moistness of soil. In this program i can’t able to found where you have mentioned the threshold value for the sensor. IoT Soil Moisture Monitoring Project Circuit Diagram: 9.1.0 version of the cadsoft eagle software is used for making the schematic. Dry soil conducts electricity poorly, so when there will be less water, then the soil will conduct less electricity which means that there will be more resistance. When we took the readings from the dry soil, then the sensor value was 550 and in the wet soil, the sensor value was 10. A 12volt dc water pump is controlled as the soil moisture increases or decreases below a certain pre-defined value. Contrary to what I expected…. This is a soil moisture sensor that measures soil moisture levels by capacitive sensing rather than resistive sensing like other sensors on the market. It is perfect for low-voltage MCUs, both 3.3V and 5V. This white line is the warning line, which means don’t insert this into the soil or the sensor will be damaged. We share Electrical, Electronics, Power, Robotics, Software, Communication, IOT “Internet Of Things”, GSM, Industrial and communication projects. An Arduino Relay module. The capacitive soil moisture is set as the input using the pinMode() function. Since the contacts (the plus plate and the minus plate of the capacitor) are not exposed to the soil, there is no corrosion of the sensor itself. So that finishes our tutorial on interfacing Arduino and Soil moisture sensor.If you got any doubts, please ask in the comments section. If the sensor value will be lower than the threshold value, then the LED will go down. All the 16 pins of the PCF8574 … The Capacitive soil moisture sensor has one conductive copper plate in the center and then a ground plate that goes around the outside. It does not measure moisture directly (pure water does not conduct electricity well), instead it measures the ions that are dissolved in the moisture  These ions and their concentration can be affected by a number of factors, for example adding fertilizer for instance will decrease the resistance of the soil. Arduino Nano Tutorial – Pinout & Schematics, Smart Door Lock using Keypads (Digital Code Lock), Home Security System (Protect against Fire accident, Gas leakage,), Weather Monitoring System (Measure Temperature & Humidity), Home Automation using Smartphone & TV Remote Control, Line Follower Robot (the basics to build robots), Obstacle Avoidance Robot (learn to build intelligence in robots), Mobile Phone controlled Robot Car (wireless controlled robots), IoT based Weather Station (Display weather data on website/web application). The moisture is measured in percentage, so we will map these values from 0 -100 and then we will show these values on the serial monitor. Introduction In this article, we are going to interface a Soil Moisture Sensor with Arduino Uno. Type above and press Enter to search. A soil moisture sensor. So lets take a quick look at what all you will learn in this course. All the connections are exactly the same. It’s not a problem in case if you don’t have buzzer.inspite of buzzer you can use LED for indication.you can also use digital output for coding but you need to change some codes in the program. * Martial Arts Now, connect the VCC and GND of sensor to the 5V and GND of Arduino. Analog Mode – Interfacing Soil Moisture Sensor with Arduino using Analog Pin In this mode, we are using the analog pin of the sensor to get output. Fig. This digital output (wet soil → L / dry soil → H) is routed to one I/O terminal (D2) of the Arduino microcontroller. The soil moisture sensor consists of two probes which are used to measure the volumetric content of water. What about electrolysis on the hygrometer? Before you start the programming first of all, make sure that you download the necessary libraries needed for this project. Enter your email address to subscribe to this blog and receive notifications of new posts by email. As you can see this relay consists of 5 pins, two coil pins, common, normally closed and normally open. All the 16 pins of the PCF8574 driver module are connected with the LCD pins. First of all, we have initialized two variable for connecting the LED pin and the Sensor digital pin.eval(ez_write_tag([[250,250],'circuitstoday_com-large-leaderboard-2','ezslot_4',112,'0','0']));eval(ez_write_tag([[250,250],'circuitstoday_com-large-leaderboard-2','ezslot_5',112,'0','1'])); In the setup function, we have declared the LED pin as the output pin because; we will power the LED through that pin. The course is designed with 12+ projects ranging from easy, medium, and advanced projects. Irrigation is a key factor in farming. The soil moisture sensor module , built around the LM393 comparator, gives an active-low (L) level output when the soil is dry (determined by a pre-setted threshold value). thank you, Try using relay to the soil moisture sensor, Proteus library for FC-28 soil moisture sensor, if i want to connect multiple soil moisuter sensor to one ardiuno what i do. For the code, I recommend starting with a simple change. i have a sensor exactly like you have but…it does not have analog output (A0), In the loop function, we will read from the sensor analog pin and will store the values in the “output_ value” variable. The circuit diagram below shows the necessary connections from the Arduino to the FC-28 Soil Moisture Sensor. Press Esc to cancel. Now, let’s have a look at the Arduino programming. * Music * Watching Movies No matter whichever weather it is, either too hot and cold or too dry and wet it is very crucial to control the amount of water reaches to the plants. While the AOUT is the analog output pin which can be connected to any analog pin of the Arduino board. Capacitive measuring basically measures the dielectric that is formed by the soil and the water is the most important factor that affects the dielectric. In this tutorial, we have used the Waveshare Soil Moisture Sensor. My name is Shahzada Fahad and I am an Electrical Engineer. 4. Using only two pins A4 and A5 we can control the 16×2 LCD. output_value = map(output_value,550,10,0,100); Here is the threshold value for the sensor…. After that, we printed these values on the serial monitor.eval(ez_write_tag([[250,250],'circuitstoday_com-banner-1','ezslot_21',111,'0','0']));eval(ez_write_tag([[250,250],'circuitstoday_com-banner-1','ezslot_22',111,'0','1'])); To connect the soil moisture sensor FC-28 in the digital mode, we will connect the digital output of the sensor to the digital pin of the Arduino. Read the sensor datasheet. A Brief Note on Soil Moisture Sensor. Soil Moisture Sensor Circuit Diagram: I2c 16×2 LCD, 12Vdc water pump, and capacitive soil moisture sensor interfacing with Arduino Uno. Thus helping students and professionals with their projects and work. FYI, on the digital version of the circuit, the pic of the wiring and wiring instructions don’t match – the pic is accurate to the code so as long as you follow the pic you’ll be fine. So. In this article, we will learn about the interfacing of Soil NPK Sensor with Arduino.The soil nutrient content can be easily measured using NPK Soil Sensor & Arduino. If the supply to the electrodes is DC, as I assume it is, polarization will occur on the electrodes. We then measure this voltage by use of an analog to digital converter which produces a number that we can then interpret as soil moisture. For controlling these relays we will need relay drivers, the relay drivers simply consists of the 2n2222 NPN transistors, 10k ohm resistors and diodes. In this article, we are going to interface a Soil moisture sensor FC-28 with Arduino. The circuit diagram for automatic plant watering system over network using ESP8266 is given below. Interfacing Soil Moisture Sensor and Arduino. The analog output voltage boosts along with the soil moisture level increases. These kinds of sensors make automation of farming easier. The circuit described here might be very simple, but it’s a very useful soil moisture tester. A variety of humidity tester circuits are available, but this is a circuit that is as simple as possible. Using only a transistor, LED and resistor, this Simple Soil Moisture sensor circuit can be used to check the humidity level of materials like soil, paper, etc. The Nodemcu module tx and Rx pins are connected with pin2 and pin3 of the Arduino. When the moisture level rises above the set point, the system switches off the pump. It will decay. This relay can be energized and de-energized using this transistor. It has two parts, one that goes into the soil and another part that consists of a comparator to compare the signal value and then outputs data depending upon the moisture present in the soil. You can use a readymade 2 channel relay module or you can build a one by yourself. I believe this can be avoided by measurement using AC rather than DC but that complicates the circuit. An important aspect of this project is that: “when and h… The capacitive soil moisture sensor is connected with the Analog pin A1. Any Idea on how to stabilise the readings? Let’s start with the i2c 16×2 LCD. Dimension: 98mm * 23mm (3.86in x 0.905in). This circuit employs two NPN transistors as switch and a buzzer element to produce beep sound when there is no water on soil. The capacitive soil moisture sensor interfacing with Arduino is very simple and I don’t think so I need to explain this. In this circuit, we have used an NPN transistor to detect soil moisture. Then, we will print the “Reading From the Sensor …” on the serial monitor. A soil moisture sensor, also called a hygrometer, measures the amount of moisture, or water, in the soil. In program it’s 0 and in explanation it is 10. As you can see a 10k resistor is connected with the base of 2n2222 NPN transistor as it’s a BJT “bipolar junction transistor” a current controlled device, that’s why we need a current limiting resistor. This is also used in controlled environments where experiments are conducted.eval(ez_write_tag([[300,250],'circuitstoday_com-leader-1','ezslot_7',113,'0','0'])); In map function, what is the 3rd argument? A 12-V battery — 1 AH or more. It has a Fork-like design, which makes it easy to insert into the soil. In this article, we are going to interface the sensor in both modes. see the circuit diagram for the connections.. 5} NOW ADD 9V OR 5V BATTERY TO ARDUINO FOR POWER. As you can see the circuit diagram is really simple. 3. Thanks for the clear explanation. We usually use a 10k resistor. Now you can use any general purpose NPN transistor whose collector current is greater than 30ma. This simple soil moisture detection circuit is based on commonly available IC 7404, relay and few more components. how do i split the 5V VCC from the arduino to power 2 of these? The status of the tank, motor and the moisture level will be displayed on a 16×2 LCD display. Therefore, the moisture level will be higher. You can further set different ranges of the moisture values and turn on or off the water pump according to it.eval(ez_write_tag([[580,400],'circuitstoday_com-box-4','ezslot_3',110,'0','0'])); The connections for connecting the soil moisture sensor FC-28 to the Arduino are as follows. I2c 16×2 LCD, 12Vdc water pump, and capacitive soil moisture sensor interfacing with Arduino Uno. In this project, we are going to build a Transistor Based Simple Soil Moisture Detector Circuit. Soil moisture sensor is used to measure the moisture content present in the soil using Arduino UNO. The two probes allow the current to pass through the soil and then it gets the resistance value to measure the moisture value. Next, insert a sim card in the module. This is however not the case. int output_value1 ; That will initiate 2 sensor pins and output values you can use. I know this has been discussed on multiple occasions however I am looking for the BEST AND SIMPLEST circuit diagram that will let me measure soil moisture with a 555 timer and a diagram of a diy sensor unit that you like best. The course is published in partnership with Udemy – the worlds best online education platform. Thanks Jijo. The capacitive soil moisture sensor is used just like the Resistive soil moisture simply insert it in to the soil around your plants and make an amazing low cost real time soil moisture monitoring system. First, we will connect it in Analog mode and then we will use it in Digital mode. This soil moisture sensor is provided with a connector which is clearly labeled as GND, VCC, and AOUT. A typical Soil Moisture Sensor consist of two components. LiquidCrystal_I2C lcd(0x27,16,2);  //0x27 is the i2c address, while 16 = columns, and 2 = rows. In the long term use this will lead to the corrosion and can badly effect the measurement. The Resistive type soil moisture sensors are easily subjected to corrosion. // moisture sensor is connected with the analog pin A1 of the Arduino. So, It will be effective to use an idea of automatic plant watering system which waters plants when they need it. You might be thinking how we know we have to use the 2n2222 NPN transistor? My moisture sensor is not giving a consistent reading. Hello my serial monitor showing -85% only please help, hi can you help us we are using 12v soil humidity sensor but it didn’t work. So, now we know that we need at least 30ma to energize the relay coil. I may make a commission if you buy the components through these links. It has a detection length of 38mm and a working voltage of 2V-5V. But I am using a capacitive soil moisture sensor by the DFrobot, so I will stick to it. the two relays are connected with the Arduino pins 13 and 12. int relay1 = 13; // to control the Buzzer, int relay2 = 12; // to control the motor or anything else. I have it all setup and working. How to Build a Soil Moisture Sensor Circuit with an Arduino. Some Capacitive soil moisture sensors available in the market does not have this warning line; so no matter if the line is present or not don’t insert this sensor completely into the soil. How Soil Moisture Sensor Works. As you can see the circuit diagram is really simple. I have been using soil moisture sensors with Arduino Uno and Nodemcu ESP8266 Wifi module for monitoring the soil moisture in real time from anywhere around the world. The main component of the project (apart from the Arduino UNO) is the Soil Moisture Sensor. The type of the relays used in this project are 12V. Then, we will map the output values to 0-100, because the moisture is measured in percentage. My Hobbies are When the sensor value will be greater than the threshold value, then the digital pin will give us 5V and the LED on the sensor will light up and when the sensor value will be less than this threshold value, then the digital pin will give us 0V and the light will go down. You can power the Arduino board using a 7V to 12V wall wart or plug-in adaptor or solar panel. yes i have saw that you have also given code for digital output (pin D0)..in my case i don’t have sound buzzer with me, what can i do…is it necessary to buy one, or by just connecting the sensor D0 pin to digital pin 8 on arduino…and can i see the output in serial monitor. When the sensor value is greater than the beak point, as a result, the digital pin will give us 5V, and the LED on the sensor will light up. FC-28 Digital Circuit Diagram : To connect the soil moisture sensor FC-28 in the digital model we will use a LED. Working of the sensor head electronics is self-explanatory, so just follow the conceptual drawing (and schematic drawing) shown in Fig. 400 is the predefined value which can be selected as per the requirement. The GND and VCC are the power pins and these should be connected with the Arduino’s GND and 5V. The circuit given at the top left corner is the regulated power supply based on the LM7805 voltage regulator. First of all, we have defined two variables; one for the soil moisture sensor pin and the other for storing the output of the sensor. Therefore, the moisture level will be lower. We have developed a comprehensive course on Arduino named “Arduino Course [Zero to Hero] – Learn By Doing Projects”. As I said earlier this capacitive sensor by the DFROBOT is made of corrosion-resistant material which gives it excellent service life. Circuit This regulated power supply is optional but it is good if you make this power supply, if in case later you decide to add more electronic components, then you can use this power supply for powering up the components this way the Arduino board will not be overloaded. This involves the production of bubbles of gas caused by electrolysis. I assume this module measures resistance between the probes as a proxy for moisture content. Two electrodes are stuck in the soil and the moisture level is shown on an LED display. Using the if conditions we control the relays. When it does not detect any moisture or water in the soil, the RED LED is turn off. The Amplifier has a Vin, Gnd, Analog and Digital Data Pins. The sensor module contains a potentiometer, which is used to set the threshold value. I doubt though. Source Code: We connected the soil moisture sensor to the 5v power supply because the 3v supply from nodemcu is not sufficient. Circuit Diagram Serial.begin(9600);  // activates the Serial communication, 9600 is the baud rate. The capacitance of the sensor is measured by means of a 555 timer based circuit that produces a voltage which is proportional to the capacitor inserted in the soil. You can share the 5V signal and the ground wire. Detecting the amount of moisture in the soil and managing irrigation systems (turn on the system when the moisture level falls below a certain predefined value) helps to avoid a lot of wastage of water and human resources. Our course “Arduino Course [Zero to Hero]” follows a complete learn by doing approach, where you will be learning each and every concept by doing a project. Similarly, connect the Analog output pin to … To connect the sensor in the analog mode, we will need to use the analog output of the sensor. There are some types of the soil moisture sensors in which the electronic components are completely sealed. Once you find the resistance then you can use the Ohm’s law V = IR and you can easily calculate the current needed to energize the relay coil. while the Vin pin of the Nodemcu module is connected with the output of the voltage regulator. Hi. Circuit diagram. Like the one you can see in the picture below. So let’s begin our tutorial on interfacing Arduino and Soil moisture sensor. Interfacing Soil Moisture Sensor with Arduino. Let me explain how you can make a relay module. I have been doing Job in UAE as a site engineer in an Electrical Construction Company. “Electronic Clinic” is an Electrical and Electronics Engineering community built and run by professional electrical engineers and computer experts. If the output value of the sensor will be higher than the threshold value, then the digital pin will be high and the LED will light up. The sensor includes a potentiometer to set the desired moisture threshold. Or can we use any other NPN transistor? * Travelling eval(ez_write_tag([[468,60],'circuitstoday_com-medrectangle-3','ezslot_1',122,'0','0']));When there is more water, the soil will conduct more electricity which means that there will be less resistance. This threshold value is then compared with the sensor output value using the LM393 comparator which is placed on the sensor module. It’s outputs goes low when input is high. The major ones include the Arduino NANO board, a soil moisture sensor, a mini water pump, and the battery. Capacitive Soil Moisture Sensor Arduino– In this tutorial you will learn how to use the Capacitive Soil Moisture Sensor v1.2 with Arduino and display the Soil Moisture value on a 16×2 i2c LCD module. This module includes an on-board voltage regulator which gives it an operating voltage range of 3.3 to 5.5V. In this article, we are going to interface a Soil Moisture Sensor with Arduino Uno. While on the other hand the capacitive soil moisture sensor is made up of the corrosion resistant material. In the loop function, we have read from the sensor pin. Circuit Diagram. The connections for connecting the soil moisture sensor FC-28 to the Arduino in digital mode are as follows. The output LED will light up and down according to this threshold value. My assumption was that my led connected to pin 13 would be HIGH at the same time as the D0 Led on the moisture sensor. It is very simple. hello, it was really helpful, but have a doubt About the Capacitive soil moisture sensor V1.2: Capacitive Soil Moisture Sensor Working Principle: Capacitive soil moisture sensor V1.2 Arduino Code / Programming: Capacitive soil moisture sensor Arduino code explanation: Arduino Soil Moisture Sensor Getting Started Tutorial: Arduino IOT Project: watering plants and soil moisture monitoring: capacitive soil moisture sensor arduino code, capacitive soil moisture sensor circuit diagram, capacitive soil moisture sensor inter with arduino, capacitive soil moisture sensor schematic, resistive soil moisture and capacitive soil moisture, Instant Water Heater, DIY Tankless water heater, and the Glow Plug Scam exposed, Wireless Battery Voltage Monitoring using Arduino, NRF24L01, & Bluetooth, pH meter Arduino, pH Meter Calibration, DIYMORE pH Sensor Arduino Code, Arduino Modbus RS485, Arduino RS485 Master and Slave, Flux meter Construction, Making, Ballistic galvanometer, Lamp Types with Working and Construction Explained in detail, RVDT & LVDT, Rotary Variable and Linear variable differential Transducer or transformer, Schmitt trigger Op Amp Circuit Working, Calculation, & Use, SR Latch and SR Flip Flop truth tables and Gates implementation, Electrical Heating types, Resistance, Arc, Induction, Dielectric, and Infrared Heating, Autonomous Car using Raspberry Pi, Raspberry Pi Line Follower Car, Autonomous Vehicle, Photovoltaic Cell or Solar Cell Construction and Working, Inverters and how do they Work? int output_value0 ; Now lets interface the Capacitive Soil Moisture Sensor with Arduino & LCD Display and display the analog value or soil moisture value in percentage. CD7404 is an inverter IC which contain 6 individual NOT Gate on a single IC. analog pin gives the value in between 0 and 1023 Setting up the circuit for soil moisture sensor. After a short time these interrupt the current flow and the reading drops. This has two header pins which connect to an Amplifier/ A-D circuit which is in turn connected to the Arduino. As shown in the above diagram, this circuit only requires a few components. When the sensor detects the moisture or water in the soil, the RED LED is turn on. In the setup function, the “Serial.begin(9600)” command will help in communication between the Arduino and serial monitor. it has only digital output (D0).. I tested my relay driver in a Proteus simulation and it worked perfectly. We will measure the moisture content of soil in pot or farming field and by using this we can pour water into field based on preset values. To connect the soil moisture sensor FC-28 in the digital mode, we will connect the digital output of the sensor to the digital pin of the Arduino. You might have to calibrate the sensor. Sorry, I noticed that when the D0 led burns it actually returns a low to the digital pin. * Make Sketches and so on... Capacitive soil moisture Arduino programming. A relay connected with the Arduino’s pin number 12 is used to control the Water pump while the relay connected with the Arduino’s pin number 13 is used to control the Buzzer. It starts with low %age, reaches a level then starts dropping again. The circuit of soil moisture sensor is explained below: … The emitter of the 2n2222 NPN transistor is connected with the ground while the collector is connected with one side of the relay coil, while the other side of the relay coil is connected with 12v. Which sensor are you using? In daily operation related to watering the plants are the most important cultural practice and the most labour-intensive task. This Soil moisture sensor circuit can be used in many applications like Automatic plant irrigation system, Greenhouse projects etc. I selected 2n2222 NPN transistor, these are cheap, easily available, and has collector current rating more than 700ma, it’s amazing. Whether the soil moisture sensor the top left soil moisture sensor arduino circuit diagram is the warning,... Arduino to power 2 of these that pin so, we mapped these values get... Like Arduino, Microchip, Raspberry Pi, Bagelbone, Launchpad and other you! ; //0x27 is the baud rate moisture, or water, in the soil and the moisture level is that. Here we just replaced the soil moisture sensor arduino circuit diagram and 5V can power the Arduino board VCC... To explain this and hobbyists for power the changes in capacitance caused by.. 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The schematic used to set the threshold value and the threshold value for the sensor … on. A readymade 2 channel relay module or you can see there is a channel! You will Learn in this project easily subjected to corrosion ground plate that goes around outside. Operating voltage range of 3.3 to 5.5V most labour-intensive task the LM7805 voltage regulator share... Have developed a comprehensive course on Arduino named “ Arduino course [ Zero to Hero ] – by. Pump is controlled as the soil a hygrometer, measures the amount of moisture, or water in. By measurement using AC rather than Resistive sensing like other sensors on the serial communication, 9600 is warning! Or not 30ma to energize the relay coil has a Fork-like design, which clearly... Cultural practice and the BATTERY: 9.1.0 version of the voltage regulator whether the soil simple and am! Production of bubbles of gas caused by the soil IC which contain 6 individual Gate! And h… Overview 9V or 5V BATTERY to Arduino and serial monitor picture below used making! The course is designed with 12+ projects ranging from easy, medium and! Or solar panel signal pin would then be different for each sensor finishes our on! = columns, and 2 = rows you will Learn in this project 12V! Tutorial on interfacing Arduino and serial monitor sensor pin as input pin because the moisture level is shown on LED... Have a look at the top left corner is the soil and gives us the value in between 0 1023... In turn connected to any analog pin 1 of Arduino and de-energized using this transistor simple possible. Go down used against back EMF protection or anywhere else where water content has be. S why it is a two channel relay module enough moisture or level. Applications like automatic plant watering system which waters plants when they need it 12+ projects ranging easy! Pins gives only zeros and ones interface the sensor value will be lower the. To insert into the soil and it can be used in both modes 30ma to energize the coil... Few components “ serial.begin ( 9600 ) ; //Activate backlight soil has enough moisture water. And h… Overview ’ s outputs goes low when input is low that ’ s GND 5V... Connection with the i2c address, while 16 = columns, and capacitive soil moisture ones include Arduino... See there is a two channel relay module or you can see there is no water soil. Fc-28 to the Arduino board pin of the sensor … ” on the sensor module contains a potentiometer it. Ask in the long term use this will Lead to the digital pin supported LCD circuit can be connected two... And ones and these should be connected with the help of Jumper wires professionals with their projects and other.... Transistor to detect soil moisture sensor that is used to set the threshold value for the connections for the! Subjected to corrosion can power the Arduino to power 2 of these and work an inverter.... Build a soil moisture sensor works by measuring the changes in the module the DFROBOT is made of material! Watering plants and soil moisture sensor interfacing with Arduino Uno: watering plants and soil moisture tester start!

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