๐ ๏ธ MAKER GUIDEJul 05, 2026โขโฑ๏ธ 1 min readโข๐ณ๐ต Tested in Nepal
Offline Voice-Controlled Smart Home Automation with ESP32 & Relays
Control lights and household appliances with natural voice commands completely offline using the ESP32 Dev Module and 4-Channel Relay from Ghumti Pasal.
๐ ๏ธ BILL OF MATERIALS (BOM)
Required Hardware & Component Checklist
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Estimated Total (4/4 items):
NPRย 2,800
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NPRย 1,200
NPRย 500
NPRย 600
NPRย 500
Offline Voice-Controlled Smart Home Automation with ESP32 & Relays
Process spoken voice commands locally without internet using an ESP32 Dev Module and a 4-Channel 5V Relay Module.
Hardware Bill of Materials:
- Microcontroller: ESP32 (38 Pin) WiFi + Bluetooth NodeMCU-32 Development Board
- Relay Module: 4 channel 5V relay module low trigger with optocoupler
- Power Supply: HLK-PM01 AC-DC 220V to 5V mini power supply module
- Display: 0.91 inch OLED module blue OLED 128X32 GND-VCC-SCL-SDA
Circuit Pinout & Wiring Connections:
| Component / Module Pin | ESP32 GPIO Pin | Function / Description |
|---|---|---|
| 4-Ch Relay IN1 (Light 1) | GPIO 18 | Channel 1 Digital Trigger |
| 4-Ch Relay IN2 (Light 2) | GPIO 19 | Channel 2 Digital Trigger |
| 4-Ch Relay IN3 (Fan) | GPIO 23 | Channel 3 Digital Trigger |
| 4-Ch Relay IN4 (Socket) | GPIO 5 | Channel 4 Digital Trigger |
| 0.91" OLED SDA / SCL | GPIO 21 / GPIO 22 | I2C Command Confirmation Screen |
| HLK-PM01 5V / GND | VIN & GND | Main Board Power Rails |
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