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That's cool. We could certainly add a buzzer to a couple of the available pins on the Arduino nano. Would you enter the alarm time in the code before uploading or do you think you could programme it so that if we added a couple of buttons on the back you could set the alarm on the device itself?
Programmable. Two potentiometers (with inbuilt on/off switches) can be used. One pot for Hours, the other Pot for Minutes. When the Pot is switched on, you can change the alarm time depending. When the Pot is switched off, it displays the current time.
A buzzer would be perfect for a simple alarm. But there is also scope for having a voice/spoken word alarm. You can use an SD card library + Playback library for PCM/WAV files to read audio clips from the SD Card. The audio signal can be sent via one of the analog pins to an external low power audio amp(E.g: LM386).
Great! Does that count for the code improvement submission?
BTW, this project is really awesome. A friend was showing me this type of device at work a few days ago. I'll show him your tutorial tomorrow!