Thisis a specially designed clock which can be programmed after the assembly and is intended to tbe used with a KS0108 monochrome LCD display.
Explanation
A 128x64 monochrome KS0108 display is controlled by the clock which is based on an ATmega328 processor. The power consumption of the whole clock is about 5V at 50mA with a total power usage under half Watt as it uses a high-efficiency white LED backlight display. The time is kept even when power is lost for years because of the battery backed-up real time clock DS1307.
The configuration tactile buttons and the alarm switch are the 2 sets of switches. Connected directly to the switch paddle through a current limiting resistor is the indicator LED. The KS0108 LCD display has a parallel 8-bit interface and runs at 5V. The microcontroller uses the internal 8MHz oscillator so there is no need for a crystal.
The switch on the right side of the clock can be clipped to turn ON the alarm. This is represented by the state of the LED. The display contrast can also be adjusted through a slot on the side of the clock.
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