Avr microcontroller using a simple system complete with two keys and 8 LED digital tube as the display. Enter the two keys representing the characters " a" and " b" , and the PC-keyboard with similar bursts of features: such as pressing the " a" key, the first 1 second, enter an " a" , after every 0.2 seconds to enter a " a" ... .... Enter the " a" in the 8 LED digital tube moving from right to left.

led.txt

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