code for the project using ARDUINO MICROCONTROLLER.
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To get full information or details of microcontroller based automatic school bell please have a look on the pages
http://kitsnsparesadmin/pdffiles/microcontroller%20based%20school%20timer.pdf
https://elprocusmicrocontroller-based-project-on-automatic-school-bell-timer/
if you again feel trouble on microcontroller based automatic school bell please reply in that page and ask specific fields in microcontroller based automatic school bell