Master Clock for Schools Based on Arduino

Controlling the signals sent to the slave clocks and keeping them synchronized are the main tasks of this master clock.

The National Time synchronization protocol is supported by the firmware in the clock which also supports two bell zones. The bells that can be set at scheduled times during the day are also controlled by the master clock. The firmware also automatically adjusts to daylight savings time but can be turned OFF.

With a minimum of controls, simplicity is emphasized in the design of the clock. By running the control program on a computer and temporarily connecting to the clock, any complex setup can be handled. The clock is set up using the Arduino USB port to connect it to a computer and run a Java control program with a GUI interface. The computer can be disconnected once the time has been set and a bell schedule loaded. If the bells are not wanted, a switch allows bells to be turned OFF.

A 9V battery is used to power the device as it normally uses green LEDs with unusual state indicated by anything else. The LEDs come with switch and LCD.

Rest of the project