10 Amazing ESP32 Home Automation Projects You Can Build Today

What it does:

Control any light in your home from your phone, web browser, or voice assistant. Turn lights on/off remotely, set schedules, and create automation routines.

Components needed:

• ESP32 development board ($5-8)
• 1-channel relay module ($3-5)
• 5V power supply or USB cable
• Jumper wires
• Plastic enclosure box ($2)

Wiring diagram:

ESP32          Relay Module
GPIO 18   →    IN
3.3V      →    VCC
GND       →    GND
COM       →    Light bulb (via 120V/230V)

Code example (OceanRemote):

#include <WiFi.h>
#include <OceanRemote.h>

const char* ssid = "YOUR_WIFI";
const char* password = "YOUR_PASSWORD";
const char* token = "YOUR_DEVICE_TOKEN";

OceanRemote device(token);
const int RELAY_PIN = 18;

void setup() {
    Serial.begin(115200);
    pinMode(RELAY_PIN, OUTPUT);
    digitalWrite(RELAY_PIN, LOW);
    
    WiFi.begin(ssid, password);
    device.begin();
}

void loop() {
    device.update();
    
    if (device.relay1()) {
        digitalWrite(RELAY_PIN, HIGH);  // Light ON
    } else {
        digitalWrite(RELAY_PIN, LOW);   // Light OFF
    }
}

What it does:

Monitor temperature and humidity in any room from anywhere. Get alerts when temperature goes above/below thresholds. Perfect for nurseries, wine cellars, or greenhouses.

Components needed:

• ESP32 development board
• DHT22 temperature/humidity sensor ($5)
• 10kΩ resistor (for DHT22)
• Breadboard and jumper wires

Wiring diagram:

DHT22         ESP32
VCC     →     3.3V
DATA    →     GPIO 4
GND     →     GND

Code example:

#include <DHT.h>
#include <OceanRemote.h>

#define DHTPIN 4
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);
OceanRemote device(YOUR_TOKEN);

void setup() {
    dht.begin();
    device.begin();
}

void loop() {
    float temp = dht.readTemperature();
    float humidity = dht.readHumidity();
    
    if (!isnan(temp)) {
        device.setTemperature(temp);
    }
    if (!isnan(humidity)) {
        device.setHumidity(humidity);
    }
    
    delay(10000);  // Update every 10 seconds
}

What it does:

Open/close your garage door from anywhere in the world. Get notifications when the door is left open. Add a magnetic sensor to know if the door is open or closed.

Components needed:

• ESP32 development board
• 1-channel relay module
• Magnetic reed switch (door sensor)
• 5V power supply

Safety First!

What it does:

Turn any appliance on/off remotely - coffee maker, space heater, lamp, or fan. Monitor power usage and set schedules.

Components needed:

• ESP32
• 5V relay module
• Outlet box with AC socket
• Power cord with plug
• AC wire (14-16 AWG)

What it does:

Never forget to water your plants again! Monitors soil moisture and automatically waters when dry. Perfect for vacations or busy schedules.

Components needed:

• ESP32
• Soil moisture sensor ($5)
• 5V mini water pump ($8)
• Relay module
• Silicone tubing
• Water reservoir

What it does:

Detect when someone enters a room. Automatically turn on lights, adjust thermostat, or trigger security alerts. Uses PIR motion sensor for reliable detection.

Components needed:

• ESP32
• HC-SR501 PIR motion sensor ($3)
• Optional: Relay for lights

What it does:

Control fan speed remotely (not just on/off). 3-speed control using PWM or relay bank. Works with ceiling fans or desk fans.

Components needed:

• ESP32
• 3 relay modules (for 3 speeds)
• AC fan (with speed wires)
• Optocoupler isolation

What it does:

Place under washing machine, dishwasher, or water heater. Sends instant notification to your phone when water is detected. Prevents costly water damage.

Components needed:

• ESP32 (battery powered possible with deep sleep)
• Water leak sensor probe or DIY copper probes
• 10kΩ resistor

What it does:

Automatically open curtains at sunrise and close at sunset. Control via voice or schedule. Motorized system using stepper motor.

Components needed:

• ESP32
• 28BYJ-48 stepper motor + driver ($10)
• Timing belt and pulleys ($15)
• 3D printed mounts or custom brackets
• Limit switches (optional)

What it does:

Monitor real-time power usage of your entire home or individual appliances. Track costs, identify energy hogs, and save money on electricity bills.

Components needed:

• ESP32
• ZMPT101B AC voltage sensor ($8)
• SCT-013 current transformer ($10)
• Safety: Isolation transformer recommended