Buzzer: Audible alerts for timers and alarms ... extra features like weather forecasts or video screens. You know, alarm clocks can be a little...boring. They tell the time, sound an alarm ...

As a project for an embedded systems class, [Alan] recently built himself a sunrise-simulating alarm clock. You are probably ... than jarring them awake with a buzzer or the radio.

His binary clock uses an Arduino Duemilanove (which ... A small piezo speaker serves as the alarm buzzer, which should be sufficient to wake up most people, though something bigger might be ...