๐ ๏ธ MAKER GUIDEMay 08, 2026โขโฑ๏ธ 1 min readโข๐ณ๐ต Tested in Nepal
Automated Factory & School Bell Scheduling System with DS3231 RTC
Automate period chimes and shift alarms with temperature-compensated DS3231 real-time clock and high-power 220V relay switching.
๐ ๏ธ BILL OF MATERIALS (BOM)
Required Hardware & Component Checklist
Curated components verified for this project. Check the items you need, adjust quantities, and add straight to cart:
Estimated Total (5/5 items):
NPRย 2,350
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NPRย 350
NPRย 750
NPRย 500
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NPRย 600
Automated Factory & School Bell Scheduling System with DS3231 RTC
The DS3231 High-Precision RTC Real Time Clock Module with TCXO oscillator maintains exact time (<1 min drift/year) to ring school and factory bells via 5V 10A Relay.
Hardware Bill of Materials:
- Precision RTC: DS3231 High Precision RTC Real Time Clock Module I2C with Battery
- Microcontroller: Arduino Nano V3.0 Solderless
- Display: 1602 (16x2) LCD Display with I2C/IIC interface - Blue Backlight
- Bell Contactor: 1 channel 5V 10A low level trigger Relay Module
- Power Supply: HLK-PM01 AC-DC 220V to 5V mini power supply module
Circuit Pinout & Wiring Connections:
| Component / Module Pin | Arduino Nano Pin | Function / Description |
|---|---|---|
| DS3231 SDA | Pin A4 | I2C Real-Time Clock Data |
| DS3231 SCL | Pin A5 | I2C Clock Synchronizer |
| 1602 LCD SDA / SCL | Pin A4 / Pin A5 | Shared I2C Time Display Bus |
| 1-Channel Relay IN | Pin D7 | Low Active Trigger for 220V Bell Gong |
| HLK-PM01 5V / GND | Nano 5V & GND | AC Mains Power Supply |
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