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IoT based Smart Irrigation System using NodeMCU ESP8266 a...

In this project, we are building an IoT based smart irrigation System using NodeMCU, Moisture sensor, and LDR.

BeginnerFull instructions provided11
IoT based Smart Irrigation System using NodeMCU ESP8266 a...

Things used in this project

Hardware components

NodeMCU ESP8266
×1
Soil Moisture Sensor Module
×1
Relay Module
×1

Software apps and online services

Adafruit IO

Story

Read more

Schematics

Smart Irrigation System Circuit Diagram

Code

Code snippet #2

Plain text
const char *ssid =  "WiFi Name";     // Enter your WiFi Name
const char *pass =  "Password"; // Enter your WiFi Password
#define MQTT_SERV "io.adafruit.com"
#define MQTT_PORT 1883
#define MQTT_NAME "User Name"
#define MQTT_PASS "AIO Key"

Code snippet #5

Plain text
int ldrStatus = analogRead(ldrPin);
if (ldrStatus <= 200) {
    digitalWrite(ledPin, HIGH);
   } else {
   digitalWrite(ledPin, LOW);
   }

Code snippet #6

Plain text
moisturePercentage = ( 100.00 - ( (analogRead(moisturePin) / 1023.00) * 100.00 ) );    Serial.print(moisturePercentage);
Serial.println("%");
  }
if (moisturePercentage < 50) {
  digitalWrite(motorPin, HIGH);         // tun on motor
}
if (moisturePercentage > 50 && moisturePercentage < 55) {
  digitalWrite(motorPin, HIGH);        //turn on motor pump
}
if (moisturePercentage > 56) {
  digitalWrite(motorPin, LOW);          // turn off mottor
}

Code snippet #7

Plain text
if (! AgricultureData.publish(moisturePercentage))
       {                    
         delay(5000);  
          }

Code snippet #8

Plain text
Adafruit_MQTT_Subscribe * subscription;
while ((subscription = mqtt.readSubscription(5000)))
     {
   if (subscription == &LED)
     {
      Serial.println((char*) LED.lastread);
   if (!strcmp((char*) LED.lastread, "OFF"))
      {
        digitalWrite(ledPin, HIGH);
    }
    if (!strcmp((char*) LED.lastread, "ON"))
      {
        digitalWrite(ledPin, LOW);
    }
 }
if (subscription == &Pump)
     {
      Serial.println((char*) Pump.lastread);
   if (!strcmp((char*) Pump.lastread, "OFF"))
      {
        digitalWrite(motorPin, HIGH);
    }
     if (!strcmp((char*) Pump.lastread, "ON"))
      {
        digitalWrite(motorPin, LOW);
    }

Programming NodeMCU for Smart Irrigation System

C/C++
#include <ESP8266WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
const char *ssid =  "Galaxy-M20";     // Enter your WiFi Name
const char *pass =  "ac312124"; // Enter your WiFi Password

WiFiClient client;

#define MQTT_SERV "io.adafruit.com"
#define MQTT_PORT 1883
#define MQTT_NAME "choudharyas"
#define MQTT_PASS "988c4e045ef64c1b9bc8b5bb7ef5f2d9"

const int ledPin = D6;
const int ldrPin = D1;
const int moisturePin = A0;             // moisteure sensor pin
const int motorPin = D0;
unsigned long interval = 10000;
unsigned long previousMillis = 0;
unsigned long interval1 = 1000;
unsigned long previousMillis1 = 0;
float moisturePercentage;              //moisture reading

//Set up the feed you're publishing to
Adafruit_MQTT_Client mqtt(&client, MQTT_SERV, MQTT_PORT, MQTT_NAME, MQTT_PASS);
Adafruit_MQTT_Publish AgricultureData = Adafruit_MQTT_Publish(&mqtt,MQTT_NAME "/f/AgricultureData");

//Set up the feed you're subscribing to
 Adafruit_MQTT_Subscribe LED = Adafruit_MQTT_Subscribe(&mqtt, MQTT_NAME "/f/LED");
  Adafruit_MQTT_Subscribe Pump = Adafruit_MQTT_Subscribe(&mqtt, MQTT_NAME "/f/Pump");

void setup()
{
  Serial.begin(115200);
  delay(10);
  mqtt.subscribe(&LED);
  mqtt.subscribe(&Pump);
  pinMode(motorPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(ldrPin, INPUT);
  digitalWrite(motorPin, LOW); // keep motor off initally
  
  Serial.println("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");              // print ... till not connected
  }
  Serial.println("");
  Serial.println("WiFi connected");
}
 
void loop()

{
   MQTT_connect();
  

 int ldrStatus = analogRead(ldrPin);

    if (ldrStatus <= 200) {
    
    digitalWrite(ledPin, HIGH);
    
    Serial.print("Its DARK, Turn on the LED : ");
    
    Serial.println(ldrStatus);
    
    } 
    else {
    
    digitalWrite(ledPin, LOW);
    
    Serial.print("Its BRIGHT, Turn off the LED : ");
    
    Serial.println(ldrStatus);
    
    }

  moisturePercentage = ( 100.00 - ( (analogRead(moisturePin) / 1023.00) * 100.00 ) );

 
    Serial.print("Soil Moisture is  = ");
    Serial.print(moisturePercentage);
    Serial.println("%");
    
    

if (moisturePercentage < 35) {
  digitalWrite(motorPin, HIGH);         // tun on motor
}
if (moisturePercentage > 35 && moisturePercentage < 37) {
  digitalWrite(motorPin, HIGH);        //turn on motor pump
}
if (moisturePercentage > 38) {
  digitalWrite(motorPin, LOW);          // turn off mottor
}


if (! AgricultureData.publish(moisturePercentage))
       {                     
         delay(5000);   
          }
Adafruit_MQTT_Subscribe * subscription;
while ((subscription = mqtt.readSubscription(5000)))
     {
    
   if (subscription == &LED)
     {
      //Print the new value to the serial monitor
      Serial.println((char*) LED.lastread);
     
   if (!strcmp((char*) LED.lastread, "OFF"))
      {
        digitalWrite(ledPin, HIGH);
    }
    if (!strcmp((char*) LED.lastread, "ON"))
      {
        digitalWrite(ledPin, LOW);
    }
 }
   
   if (subscription == &Pump)
     {
      //Print the new value to the serial monitor
      Serial.println((char*) Pump.lastread);
     
   if (!strcmp((char*) Pump.lastread, "OFF"))
      {
        digitalWrite(motorPin, HIGH);
    }
     if (!strcmp((char*) Pump.lastread, "ON"))
      {
        digitalWrite(motorPin, LOW);
    }

     }
     }
}
void MQTT_connect() 
{
  int8_t ret;

  // Stop if already connected.
  if (mqtt.connected()) 
  {
    return;
  }

  uint8_t retries = 3;
  while ((ret = mqtt.connect()) != 0) // connect will return 0 for connected
  { 
       
       mqtt.disconnect();
       delay(5000);  // wait 5 seconds
       retries--;
       if (retries == 0) 
       {
         // basically die and wait for WDT to reset me
         while (1);
       }
  }
}

Github

https://github.com/adafruit/Adafruit_MQTT_Library

Credits

ProjectsDIY
6 projects • 8 followers
Electronic projects, Arduino, Raspberry Pi, NodeMCU, Sensor, IoT based projects. Tutorial and instruction for all projects. DIY projects.

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