Digital Soil Moisture Sensor
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This document describes a digital soil moisture sensor that can be used to automatically monitor soil moisture levels and trigger watering systems. The sensor outputs a digital signal indicating soil moisture levels and can connect to devices like Arduino. It works by measuring the dielectric constant of soil which corresponds to moisture level. The sensor has adjustable sensitivity and threshold levels and provides digital, analog or serial output of moisture readings for various microcontroller applications.
Digital Soil Moisture Sensor
- 1. www.researchdesignlab.com Page 1 DIGITAL SOILMOISTURE SENSOR DIGITAL SOIL MOISTURE SENSOR
- 2. www.researchdesignlab.com Page 2 DIGITAL SOILMOISTURE SENSOR Table of Contents OVERVIEW ................................................................................................................................... 3 INTRODUCTION ...................................................................................................................... 3 FEATURES ................................................................................................................................ 3 APPLICATIONS........................................................................................................................ 4 SPECIFICATIONS..................................................................................................................... 4 PIN DETAILS ............................................................................................................................ 4 USING THE SENSOR ............................................................................................................... 5 WORKING ................................................................................................................................. 5 APPLICATION DIAGRAM ...................................................................................................... 6 CODES AND SCHEMATIC...................................................................................................... 6 CONNECTION WITH ARDUINO............................................................................................ 7 OUTPUT..................................................................................................................................... 8 RELATED PRODUCTS ............................................................................................................ 9
- 3. www.researchdesignlab.com Page 3 DIGITAL SOILMOISTURE SENSOR OVERVIEW INTRODUCTION This sensor can be used to test the moisture of soil, when the soil is having water shortage, the module output is at high level, else the output is at low level. By using this sensor one can automatically water the flower plant, or any other plants requiring automatic watering technique. Module triple output mode, digital output is simple, analog output more accurate, serial output with exact readings. FEATURES 1. Sensitivity adjustable. 2. Has fixed bolt hole, convenient installation. 3. Threshold level can be configured. 4. Module triple output mode, digital output is simple, analog output more 5. accurate, serial output with exact readings.
- 4. www.researchdesignlab.com Page 4 DIGITAL SOILMOISTURE SENSOR APPLICATIONS 1. Agriculture 2. Landscape irrigation SPECIFICATIONS Parameter Value Operating Voltage +5v dc regulated Soil moisture Digital value is indicated by out pin PIN DETAILS Pin Name Details 1 out Active high output 2 +5v Power supply 3 gnd Power supply gnd 4 rx receiver 5 tx transmitter 6 gnd Power supply gnd
- 5. www.researchdesignlab.com Page 5 DIGITAL SOILMOISTURE SENSOR USING THE SENSOR 1. Connect +5v to pin 2 and ground to pin 3 and 6. 2. Pin 4 and 5 should be connected to particular transmitter and receiver pin of 3. Output pin may be connected to any port pins and can be used to any application. WORKING Soil moisture sensors measure the water content in soil. A soil moisture probe is made up of multiple soil moisture sensors. One common type of soil moisture sensors in commercial use is a Frequency domain sensor such as a capacitance sensor. Another sensor, the neutron moisture gauge, utilizes the moderator properties of water for neutrons. Soil moisture content may be determined via its effect on dielectric constant by measuring the capacitance between two electrodes implanted in the soil. Where soil moisture is predominantly in the form of free water (e.g., in sandy soils), the dielectric constant is directly proportional to the moisture content. The probe is normally given a frequency excitation to permit measurement of the dielectric constant. The readout from the probe is not linear with water content and is influenced by soil type and soil temperature. Therefore, careful calibration is required and long-term stability of the calibration is questionable.
- 6. www.researchdesignlab.com Page 6 DIGITAL SOILMOISTURE SENSOR APPLICATION DIAGRAM CODES AND SCHEMATIC ATMEL UART http://researchdesignlab.com/soil-moisturre-urat-schematic.html http://researchdesignlab.com/soil-atmel-uart-code PIC http://researchdesignlab.com/digital-soil-pic-code.html RASPBERRY AND BEAGLEBONE http://researchdesignlab.com/digital-soil-raspberryandbeaglebone-code.html
- 7. www.researchdesignlab.com Page 7 DIGITAL SOILMOISTURE SENSOR CONNECTION WITH ARDUINO ARDUINO CODE #include <SoftwareSerial.h> SoftwareSerial mySerial(10, 11); // TX,RX void setup() { // Open serial communications and wait for port to open: Serial.begin(9600); while (!Serial) { ; // wait for serial port to connect.
- 8. www.researchdesignlab.com Page 8 DIGITAL SOILMOISTURE SENSOR } Serial.println("Digital all sensor"); mySerial.begin(9600); // set the data rate for the SoftwareSerial port } void loop() // run over and over { if (mySerial.available()) Serial.write(mySerial.read()); } OUTPUT
- 9. www.researchdesignlab.com Page 9 DIGITAL SOILMOISTURE SENSOR RELATED PRODUCTS PIC PROJECT BOARD PIC DEVELOPMENT BOARD ATMEL PROJECT BOARD ATMEL DEVELOPMENT BOARD