Taxi meter design: AT89S52 microcontroller as the center, ranging through the metal sensors to achieve statistical valuation of the taxi. Combining voice chip ISD4004, clock chip DS1302, composed voice amplifier module LM386N-time control system, and finally through the LCD display module LCD12864 price, distance, total time, etc. The system can modify the price, starting at daytime at night price display and time. AT89S52 through the P0 port is connected to an external circuit voice quotes, quotes voice functionality can be achieved

chuzuchejijiaqi
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