LCD TIMER WITH ALARM
Most microwave ovens feature at least one timer with an alarm. Older appliances used mechanical timers, but modern microwave ovens and cooking ranges feature electronic timers using digital circuitry. The concept of a timer is sketched in Fig. 50.7. In this system, the keypad is the input and both the digital display and alarm buzzer are the output devices. The processing and storage of data occur within the digital circuits block in Fig. 50.7 (a).
Fig. 50.7 Digital timer system
A somewhat more detailed block diagram of a digital timer is shown in Fig. 50.7 (b). The digital circuits block has been subdivided into four ...
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