说明：  51单片机和12位ADC tlc2543的加上12864液晶和12位DAC7611以及矩阵键盘的连调程序，调试已通过，在硬件电路也调试通过，精度很高。
(51 single and 12-bit ADC tlc2543 the plus 12864 and 12-bit DAC7611 and the transfer matrix keyboard with the program, debugging has passed, the hardware circuit debugging, high precision.)