This project demonstrates a Home Automation System using an ESP32, a 4-channel relay module, a DHT22 temperature sensor, and Blynk IoT. Users can remotely control four appliances through the Blynk mobile application while monitoring real-time temperature data.
- Remote control of 4 appliances using Blynk
- Real-time temperature monitoring
- ESP32 Wi-Fi connectivity
- Cloud-based control from anywhere
- Compatible with Wokwi Simulator
- ESP32 Development Board
- DHT22 Temperature Sensor
- 4-Channel Relay Module
- Blynk IoT Account
- Wi-Fi Connection
| DHT22 Pin | ESP32 Pin |
|---|---|
| VCC | 3.3V |
| GND | GND |
| DATA | GPIO 4 |
| Relay Channel | ESP32 GPIO |
|---|---|
| Relay 1 | GPIO 23 |
| Relay 2 | GPIO 22 |
| Relay 3 | GPIO 21 |
| Relay 4 | GPIO 19 |
| Function | Virtual Pin |
|---|---|
| Relay 1 Control | V1 |
| Relay 2 Control | V2 |
| Relay 3 Control | V3 |
| Relay 4 Control | V4 |
| Temperature Display | V5 |
- ESP32 connects to the configured Wi-Fi network.
- ESP32 establishes a connection with the Blynk Cloud.
- The DHT22 sensor continuously measures ambient temperature.
- Temperature readings are sent to the Blynk dashboard.
- Users can control appliances through Blynk buttons.
- Corresponding relays switch ON or OFF based on user commands.
Create the following widgets in your Blynk template:
| Widget | Virtual Pin |
|---|---|
| Button | V1 |
| Button | V2 |
| Button | V3 |
| Button | V4 |
| Gauge / Value Display | V5 |
- Mode: Switch
- Value: 0 (OFF), 1 (ON)
- ESP32 DevKit V1
- DHT22 Sensor
- 4 Relay Modules
- Blynk
- DHT Sensor Library by Adafruit
- Adafruit Unified Sensor
- Smart Home Automation
- Remote Appliance Control
- IoT Learning Projects
- Home Monitoring Systems
- Educational Demonstrations
- Humidity Monitoring
- Voice Assistant Integration
- Appliance Scheduling
- Energy Consumption Monitoring
- Push Notifications and Alerts
Kritish