🌱 IoT Soil Moisture Monitor

Connect your plants to the internet and view live moisture levels on a web dashboard.

📋 Overview

The ESP8266 is a low-cost Wi-Fi microchip. Paired with a capacitive soil moisture sensor, it creates an affordable IoT solution for plant care.

What you'll learn: Wi-Fi connectivity on the ESP8266, hosting a basic web server, and reading analog data without corrosion (using a capacitive sensor).

Estimated time: 1-2 hours. Difficulty: ⭐⭐⭐ Intermediate.

🧩 Components Needed

Component	Specification	Qty	Notes
ESP8266 (NodeMCU)	3.3V Logic, Wi-Fi	1	D1 Mini also works
Capacitive Soil Sensor	v1.2 or similar	1	Prevents corrosion
Jumper Wires	Female-to-Female	3

📖 Step-by-Step Tutorial

Wire the Sensor

Connect VCC to 3.3V, GND to GND, and AOUT to A0 (Analog input) on the ESP8266.

Setup Wi-Fi

In the code, enter your SSID and password.

Upload Code

Select NodeMCU 1.0 in Arduino IDE. Ensure you have the ESP8266 board definitions installed.

View Dashboard

Open the Serial Monitor to find the IP address, then type it into your browser.

💡

Capacitive sensors measure changes in capacitance caused by water, unlike resistive ones that pass current and corrode quickly.

💻 Code / Configuration

iot_soil_moisture.ino

INO

// IoT Soil Moisture Monitor
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>

const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";
ESP8266WebServer server(80);

void handleRoot() {
  int moisture = analogRead(A0);
  String html = "<h1>Volt X Plant Monitor</h1>";
  html += "<p>Raw Moisture Level: " + String(moisture) + "</p>";
  server.send(200, "text/html", html);
}

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED) { delay(500); }
  server.on("/", handleRoot);
  server.begin();
}

void loop() {
  server.handleClient();

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