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"A home for dreamers"
"A home for dreamers"
A high-precision RTC-based automated relay trigger designed to sound school bells on exact class change intervals.
Manual bell ringing in local schools frequently suffers from human delays and inconsistency during exam and period changes.
Use a battery-backed DS3231 real-time clock connected to an ATmega328P to cycle a 30A electromagnetic relay connected to the school electric gong.
Constructed on a custom copper-clad prototype board with an optical isolation optocoupler (PC817) to prevent high-voltage AC back-EMF from resetting the microcontroller.
Demonstrated complete scheduling reliability with an intuitive keypad for manual overrides during holidays and emergency assemblies.