16-character dot matrix LED screen+ DS1302 electronic bell C 1-pin+5 V 2,3 received crystal 32768HZ feet 4 feet 5 feet grounding the S51 then take P02 6 feet of the S51 the S51 then P01 7 pin P00 8 back-up power supply, can access the old computer' s motherboard of 3.6V batteries, can also be isolated by one diode large-capacity electrolytic capacitor voltage in the 2.5V to the maintenance of more than 595 company-output data, 138 firms P1_0 drive mode conversion key for the clock, P2_1 to Clock plus key, P1_2 key for the clock by, P2_3 reset button for the clock. Adjustment of the clock adjustments do not deal with scintillation

64x64LED.c

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