Published August 1, 2019

Automated Plant Watering System Based on Internet of Things

With this project, we will be able to water our plant automatically and monitor it from our smartphone.

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Automated Plant Watering System Based on Internet of Things

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board

Seeed Studio Grove - Relay

DHT11 Temperature & Humidity Sensor (3 pins)

SparkFun Soil Moisture Sensor (with Screw Terminals)

DC 12 V Pump

Software apps and online services

Blynk

Story

This project is a request from my friend to fulfill his task in the microcontroller subject. This idea is from him, so I just make the idea work.

For the Android apps, because we don't have enough time to make our custom apps, so we decided to use Blynk to for our Android apps platform.

Happy learning!

Code

Main Code

#define BLYNK_PRINT Serial
#include <BlynkSimpleEsp8266.h>
char auth[] = "XXXXXXXXXXXXXXXX"; //Auth Blynk
char ssid[] = "XXXXXXXXXXXXXXXX"; //SSID WiFi
char pass[] = "XXXXXXXXXXXXXXXX"; //Pass WiFi
BlynkTimer timer;

#include "DHT.h"
#define DHTPIN 4 //Deklarasi pin DHT11 = 4 (D2)
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

int relay = 5; //Deklarasi pin relay = 5 (D1)
float persen;

void setup() {
  Blynk.begin(auth, ssid, pass);
  dht.begin();
  pinMode (relay, OUTPUT);
  timer.setInterval(1000L, analogSense);
  timer.setInterval(1000L, th);
}

void loop() {
  Blynk.run();
  timer.run();
}
void analogSense(){ //Sensor Kelembaban Tanah
  float s1 = analogRead(A0);
  persen=((1024-s1)/1024)*100; 
  Blynk.virtualWrite(V7, persen);
  if(persen<=60){ //Jika Kelembaban Air <= 40, maka Pompa ON
    relayON();
  }
  else if(persen>60){ //Jika Kelembaban Air > 40, maka Pompa Off
    relayOFF();
  }
}
void th(){ //Suhu dan Kelembaban (DHT11)
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  Blynk.virtualWrite(V5, h);
  Blynk.virtualWrite(V6, t);
}
void relayON(){
  digitalWrite(relay, LOW);
  WidgetLED relay(V8);
  relay.on();
}
void relayOFF(){
  digitalWrite(relay, HIGH);
  WidgetLED relay(V8);
  relay.off();
}