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DIY Electronic Alarm

This is my DIY Electronic Alarm, now the prototype has been finished with breadboard,

but the PCB layout has not been finished yet.

I use a MCU(Arduino Uno) and four 74LS47 7-segment-display drivers to control

the four 7-segment-displays to show the digits of Minutes and Seconds.

When the alarm is triggered, the buzzer will generate sound.







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