Remote Agriculture Solution
Blog Links:
#02: Components and Design Structure
#04: Setting up Arduino Nano 33 IOT
#08: Linking Everything to Arduino Nano 33 IOT
#09: Time to See the Work in Action
In this blog, we will create the setup for the pest control system.
As we did in the last blog, we will similarly make the same system for pest control.
We will use an ultrasonic sensor to measure the pesticide level in the container. Once the pesticide level falls below a certain threshold, we will send an email using the Blynk App. Also we will send level of our pesticide container to the Blynk App continuously so it can be looked at any time. For the pest control system, we will add a button to send signal to Arduino Nano 33 IOT to spray the pesticide using Blynk App. PIN V2 was used for this purpose. The pump would turn on and spray the pesticide. For this, an L293D module was used as before.
Whenever the distance from the Ultrasonic sensor was less than 4, we sent an email warning to refill the pesticide tank.
//sending email when pesticide level falls below 4
if (cm < 4)
{
Blynk.email("Pesticide level alert", "Fill pesticide in the container");
}
return cm;
For spraying pesticide based on user input, I used the below snippet of code
//for spraying pesticide when user calls it
int value;
BLYNK_WRITE(V2)
{
value = param.asInt();
}
if (value == 1)
{
digitalWrite(motorB1, HIGH);
digitalWrite(motorB2, LOW);
delay(30);
digitalWrite(motorB1, LOW);
digitalWrite(motorB2, LOW);
}
Code:
//Remote Agriculture Solution
//Pesticide System
/* Using Arduino Nano 33 IOT
Dev: Aaryan Arora
For Design For A Cause 2021
*/
//libraries
#define BLYNK_PRINT SerialUSB
#include <SPI.h>
#include <WiFiNINA.h>
#include <BlynkSimpleWiFiNINA.h>
#include <EduIntro.h>
/* Used this library for getting temperature reading from DHT 11
Can be downloaded from here or arduino library manager
https://github.com/arduino/EduIntro
*/
//for water level
#define TRIGGER_PIN1 8 // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN1 12 // Arduino pin tied to echo pin on the ultrasonic sensor.
//for pesticide level
#define TRIGGER_PIN2 9 // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN2 10 // Arduino pin tied to echo pin on the ultrasonic sensor.
//water pump
const int motorA1 = 2; //motor A positive pin to pin 6 (PWM) (from L293D module!)
const int motorA2 = 3; //motor A negative pin to pin 9 (PWM)
//pesticide pump
const int motorB1 = 5; //motor B positive pin to pin 10 (PWM)
const int motorB2 = 6; //motor B negative pin to pin 11 (PWM)
DHT11 dht11(D7); // creating the object sensor on pin 'D7'
int water_level(); //to measure level of water in container
int pesticide_level(); //to measure level of pesticide in container
//Use your authorization token after creating new project in Blynk App
char auth[] = "";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "";
char pass[] = "";
//constants
int LDRpin = A0; // select the input pin for LDR
int LDRvalue = 0; // variable to store the value coming from the LDR
int lux = 0; //to store the intensity of light in lux
long duration, cm;
int soil_pin = A2; //soil sensor pin
int moisture_value ; //storing result from soil sensor
BlynkTimer timer;
// This function sends Arduino's up time every second to Virtual Pin (5).
// In the app, Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
void myTimerEvent()
{
//starting the DHT 11 sensor
dht11.update();
//Getting the LDR analog value
LDRvalue = analogRead(LDRpin);
//Using the formula for conversion from analog value to lux
lux = (512000 / LDRvalue) - 500;
//calculating moisture percentage using analog value of the sensor
moisture_value = analogRead(soil_pin);
//converting to percentage
moisture_value = (moisture_value * 100) / 1023;
//using formula to account for resistance
moisture_value = 35 + (100 - moisture_value);
//sending all values to the Blynk App using Virtual Pins
Blynk.virtualWrite(V5, lux);
Blynk.virtualWrite(V6, dht11.readCelsius());
Blynk.virtualWrite(V7, dht11.readHumidity());
Blynk.virtualWrite(V8, moisture_value);
Blynk.virtualWrite(V0, water_level());
Blynk.virtualWrite(V1, pesticide_level());
}
void setup() {
//Setting pins from Ultrasonic Sensor
pinMode(TRIGGER_PIN1, OUTPUT);
pinMode(ECHO_PIN1, INPUT);
SerialUSB.begin(9600);
Blynk.begin(auth, ssid, pass);
// Setup a function to be called every 5 seconds
timer.setInterval(5000L, myTimerEvent);
}
void loop() {
Blynk.run();
timer.run(); // Initiates BlynkTimer
//for watering the crop below 60 moisture level
if(moisture_value < 60)
{
digitalWrite(motorA1,HIGH);
digitalWrite(motorA2,LOW);
delay(100);
digitalWrite(motorA1,LOW);
digitalWrite(motorA2,LOW);
}
//for spraying pesticide when user calls it
int value;
BLYNK_WRITE(V2)
{
value = param.asInt();
}
if (value == 1)
{
digitalWrite(motorB1, HIGH);
digitalWrite(motorB2, LOW);
delay(30);
digitalWrite(motorB1, LOW);
digitalWrite(motorB2, LOW);
}
}
int water_level() {
digitalWrite(TRIGGER_PIN1, LOW);
delayMicroseconds(2);
digitalWrite(TRIGGER_PIN1, HIGH);
delayMicroseconds(10);
digitalWrite(TRIGGER_PIN1, LOW);
// Read the signal from the sensor: a HIGH pulse whose
// duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(ECHO_PIN1, INPUT);
duration = pulseIn(ECHO_PIN1, HIGH);
// Convert the time into a distance
cm = (duration * 0.0348) / 2;
//sending email when water level falls below 3
if (cm < 3)
{
Blynk.email("Water level alert", "Fill water in the container");
}
return cm;
}
int pesticide_level() {
digitalWrite(TRIGGER_PIN2, LOW);
delayMicroseconds(2);
digitalWrite(TRIGGER_PIN2, HIGH);
delayMicroseconds(10);
digitalWrite(TRIGGER_PIN2, LOW);
// Read the signal from the sensor: a HIGH pulse whose
// duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(ECHO_PIN2, INPUT);
long duration = pulseIn(ECHO_PIN2, HIGH);
// Convert the time into a distance
long cm = (duration * 0.0348) / 2;
//sending email when pesticide level falls below 4
if (cm < 4)
{
Blynk.email("Pesticide level alert", "Fill pesticide in the container");
}
return cm;
}
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