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Based on the Countdown with LCD 2x16, we have made this variant of the countdown. The countdown circuit, or the backwards counting we shall describe, shows the visualisation of the backwards counting on four 7 segment displays.
On-off sequence of three relays with a push button, microcontroller PIC 12F675.
With the already known microcontroller PIC 16F873A and the integrated circuit DS1307 we have built this calendar clock.