Strangeness of this clock is in its expression of numbers, which is realized using seven Leds. Leds are located inside a pipe, one above another and if we move Leds enough fast left or right, we have a space where we can write numbers, characters or anything else. source
MCS-51 Microcontroller
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Unusual clock with AT89C2051
Catagory : Clock circuits, MCS-51 Microcontroller
Telephone Remote Switch
This device connects to the telephone line and can be used to remotely control up to 4 relay outputs using a DTMF (tone dialing) telephone. A number of user settings are available to improve the useability and security of the device. The unit is controlled by an Atmel 89C2051
microcontroller.source
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