Although digital alarm clocks have been around for years, most of today’s off the shelf products suffer from serious design limitations. For example, many don’t keep track of weekdays and can only store one alarm time. High time for a home-brew design that does a better job.Off the shelf alarm clocks present a serious limitation if, for instance, you and your partner have different wake-up times or if you have to give or take medication at regular intervals. This limitation gets more serious if you want alarms to go off only on specific days of the week or only during work days. The time setting process on most clocks is also subject to improvement. In the majority of cases you adjust time by incrementing minutes and hours. If your clock is at, say, 06:15h and the correct time is 20:58h you need to keep a key pressed for quite some time and release it well before the desired hour/minute, switching to ‘slow’ setting. If not, you’re past the desired time and have to start all over again.