期末鸿文业设计题目(国外英文资料).docVIP

期末大作业设计题目(国外英文资料) One, taxi automatic meter design The design requirements (1) there is a charge for driving mileage, the charging of time and the starting price, and the total amount is shown in four digital tubes, the maximum value is 99.99 yuan. (2) the unit price is one yuan per kilometer, the waiting time is 0.5 yuan per kilometer, and the starting price is 3 yuan (starting at 3 kilometers). (3) the mileage of the charging circuit converts the car mileage proportional to the number of pulses, and the counting decoding circuit converts the charges, experiments with a pulse mock the car forward 10 meters, said the 100 pulses each 1 km, and then use BCD proportion multiplier mileage pulse number multiplied by the proportion coefficient of the unit price per kilometer, the proportion coefficient can be preset by switches. For example, the unit price is 1.0 yuan per kilometer, and the pulse equivalent is 0.01 yuan per pulse. (4) using LED to show the mileage, 2 digital tubes display charges. Electronic cryptography lock The design requirements (1) design a combination lock control circuit, when the input the correct code, the lock output to drive actuators work, with a red light and green light will consume said shut, with green light, red light goes out the lock; (2) in the control circuit of the lock store one can modify the four code, when the lock button switch (can be set up to 6 ~ 8 bits, four of them real effective, the rest of the dummy) as the input code is equal to the storage of code, the lock; (3) within 5 s after touches the first button if not open the lock, automatic reset circuit, and enter, self-locking condition, unable to open, and the speaker sends out the last 20 s alarm signal. 3, pulse button telephone display The design requirements (1) the number of keys can be displayed accurately; (2) the display shows the content from low to high, a number of key digits, and the lowest level is the current input. (3) set up a redial button, press this bu