Blynk IoT Smart farming using water pump

Hello readers, we are back with a new project. In this article, we are going to make an IoT Smart farming and control it via the Blynk application by using NodeMCU. The water pump can be controlled using the Blynk app. Read the full article on our website. Just write your network’s SSID, PASSWORD, and the unique token number in the code given below. For turning the water pump on and off use the button which is appeared inside the app.

Set up the Blynk app

First of all, install the Blynk IoT app on your smartphone and then sign in to the app. Provide your email address so the Blynk app can send a token number to you on your email.

Then you will see the page which is given below and you have to select a new project from it.

Now name the project according to your choice (Smart Water Pump) and choose the device as NodeMCU. Select the connection type to wifi as given in the image.

Then you can choose what to use in the app. You can add different widgets, buttons, or controllers. Click on the plus button to open the widget box.

Now from the menu choose a button and a value display widget as shown below.

When you successfully add the widgets then go to the button settings and set the pin to virtual 12. You can also name the button.

Now do the same for the value display widget. Name it as a switch value and select the V12 pin for it.

The complete app setup looks like this.

Components Required

• NodeMCU esp8266
• Single-channel relay
• DC water pump
• Push-button
• Jumper wires and a breadboard
• Smartphone with a good internet connection
• 12-volts DC power supply
• USB cable for uploading the code

IoT Smart farming Circuit diagram

IoT Smart farming Circuit diagram

3.3-volts pin of the NodeMCU -> VCC pin of the relay

GND pin of the NodeMCU -> GND pin of the relay

digital-4 pin of the NodeMCU -> signal pin of the relay

digital-6 pin of the NodeMCU -> one side of the pushbutton

GND pin of the NodeMCU -> another side of the pushbutton

Pins of the water pump -> one to the negative supply and other to the relay as shown

IoT Smart farming Code

Note: Please upload the code to the nodemcu.

//TECHATRONIC.COM
// ESP8266 LIBRARY
// https://github.com/ekstrand/ESP8266wifi
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <ESP8266mDNS.h>
#include <WiFiUdp.h>
#include <ArduinoOTA.h>
BlynkTimer timer;
void checkPhysicalButton();
int relay1State = LOW;
int pushButton1State = HIGH;
#define AUTH "P5weseHWDxxkwm-SH0GARQt9lStSl-hF"
#define WIFI_SSID "DESKTOP"  //Enter WIFI Name
#define WIFI_PASS "asdfghjkl" //Enter WIFI Password
#define SERVER "blynk-cloud.com "
#define PORT 8442
#define RELAY_PIN_1   D4
#define PUSH_BUTTON_1  D6
#define VPIN_BUTTON_1  V12
#define OTA_HOSTNAME "Home_Automation"
BLYNK_CONNECTED() {
// Request the latest state from the server
Blynk.syncVirtual(VPIN_BUTTON_1);
}
// When App button is pushed - switch the state
BLYNK_WRITE(VPIN_BUTTON_1) {
relay1State = param.asInt();
digitalWrite(RELAY_PIN_1, relay1State);
}
void checkPhysicalButton()
{
if (digitalRead(PUSH_BUTTON_1) == LOW) {
// pushButton1State is used to avoid sequential toggles
if (pushButton1State != LOW) {
// Toggle Relay state
relay1State = !relay1State;
digitalWrite(RELAY_PIN_1, relay1State);
// Update Button Widget
Blynk.virtualWrite(VPIN_BUTTON_1, relay1State);
}
pushButton1State = LOW;
} else {
pushButton1State = HIGH;
}
}
void setup()
{
Serial.begin(115200);
Blynk.begin(AUTH, WIFI_SSID, WIFI_PASS,"blynk-cloud.com", 8442);
ArduinoOTA.setHostname(OTA_HOSTNAME); // For OTA - Use your own device identifying name
ArduinoOTA.begin(); // For OTA
pinMode(RELAY_PIN_1, OUTPUT);
pinMode(PUSH_BUTTON_1, INPUT_PULLUP);
digitalWrite(RELAY_PIN_1, relay1State);
// Setup a function to be called every 100 ms
timer.setInterval(500L, checkPhysicalButton);
}
void loop()
{
Blynk.run();
ArduinoOTA.handle();
timer.run();
}

Check out more tutorials on Arduino and Raspberry Pi.

HAPPY LEARNING!