1. Design requirements and goals
Specific functions:
1. No passenger mode: display the current time;
2. Switch to passenger mode: display the starting price (within three kilometers), unit price (after three kilometers), total price (yuan), mileage and travel time, yes Charges according to mileage or timing;
3. Charges in mileage mode: in high-speed conditions, charges according to starting price and mileage unit price
4. Hourly charges mode: charges in accordance with timing time and unit price in low-speed conditions
5. Press reset Button, the meter can clear the pricing.
6. The starting price and unit price of day and night can be set, and the unit price of timing mode can be set;
7. According to the current time, day and night charges are different.
2. Design ideas and plans
This time the taxi meter design can be divided into six modules, the main control module, timing module, storage module, display module, button module and motor drive module.
The design block diagram is as follows:
3. Hardware circuit
