๐ ๏ธ MAKER GUIDEMay 06, 2026โขโฑ๏ธ 1 min readโข๐ณ๐ต Tested in Nepal
Smartphone Bluetooth Android App Appliance Controller with HC-05
Control home lighting, fans, and electronics wirelessly from any Android smartphone via custom Bluetooth controls and Arduino.
๐ ๏ธ BILL OF MATERIALS (BOM)
Required Hardware & Component Checklist
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Estimated Total (4/4 items):
NPRย 2,170
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NPRย 650
NPRย 750
NPRย 500
NPRย 270
Smartphone Bluetooth Android App Appliance Controller with HC-05
Pair your smartphone directly with the HC-05 Wireless Bluetooth Serial Module to switch 4 channels of 220V household appliances through an Arduino Nano.
Hardware Bill of Materials:
- Bluetooth Module: HC-05 Wireless Bluetooth Serial Transceiver Module Master Slave 6 Pin
- Microcontroller: Arduino Nano V3.0 Solderless
- Relay Board: 4 channel 5V relay module low trigger with optocoupler
- Power Supply: 5V 2A Power Adapter
Circuit Pinout & Wiring Connections:
| HC-05 Pin | Arduino Nano Pin | Function / Description |
|---|---|---|
| HC-05 VCC / GND | 5V / GND | Bluetooth Module Power |
| HC-05 TXD | Pin D2 (SoftwareSerial RX) | Serial Data from Phone App |
| HC-05 RXD | Pin D3 (via 1k/2k Voltage Divider to 3.3V) | Serial Response to Phone App |
| 4-Ch Relay IN1 - IN4 | Pin D7, D8, D9, D10 | 4-Channel 220V Appliance Actuators |
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