Ticking Clocks (Smart 24-Hour Railway Clock & Timeline Tracker)
Source: Stemoto Original
Convert 12-hour AM/PM time to 24-hour railway time on a dual digital-analog clock board with a DS3231 RTC chip. Calculate train travel durations and elapsed time across 24-hour schedules.
Categorisation
Props & Materials Required
- •Dual clock board (12-Hour AM/PM dial & 24-Hour Digital LED)
- •DS3231 Real-Time Clock (RTC) module
- •KY-040 rotary encoder hand dial
- •ESP32 controller board
- •16x2 LCD display screen
- •DFPlayer Mini MP3 module + 3W speaker
Step-by-Step Instructions
Turn Clock to 6:15 PM
Rotate the minute hand to 6:15 PM.
Observe 24-Hour Digital Display
Digital display updates instantly to '18:15'.
24-Hour Conversion Rule Audio
Speaker narrates: '6:15 PM in railway time is 18:15 hours! Add 12 to PM hours: 6 + 12 = 18!'
Train Journey Elapsed Time Quiz
Train departs at 08:30 and arrives at 16:45. Speaker asks: 'How long was the journey?' Child inputs 8h 15m → Confirms on screen!
Why It Works & Notes
24-hour clock conversion (e.g. 5:30 PM = 17:30) is vital for railway schedules and flight travel. Turning an analog clock dial while watching the 24-hour digital readout update makes 12h ↔ 24h conversion intuitive.
Maths Mela Class 4 Chapter 12 | STEM Tech: RTC Microsecond Clock Synchronization & 12h/24h Conversion Logic — airport and railway station master time servers.