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The use of a few LEDs to display a line of text is very interesting job, with less number of LEDs that can be displayed by the text, it need a motor to rotate the circuit is programmed by the microcontroller 89s52 control data to 8 leds. Shematic circuit: Use 8 led to display the text Complete | pic:kmitl.ac.th Firmware: 8 leds connected to the Port of 89s52 and P1 + 3V Lithium battery adopted by. Speed and content easily change text in the program. Download the program at the end of the page (.C, .Hex)|| Download code here