Through ATmel company's mega328p chip as the core, the use of 4 segment digital tube, through the USB connection computer serial port. Using Arduino serial detector to send commands to achieve: 1. displays any 4 digits (including decimals). 2. of the number of the last plus one (not carry). 3. the number of changes to multiply ten, when the arrival of no decimal point, automatically changed to ten, when it is too small to display automatically become ten. 4. loop moves left and the loop moves right (where the decimal point remains unchanged).

b1.ino

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