little-car

This is the final porject for CS207 Digital Logic Authors: Yunxiang Yan, Zixu Huang

1. Project Timeline

Mid-DDL: 12.15 Final DDL: 1.8

• Play with demo
• Demand Analysis
• Functionality Design
• Structure Design
• Coding: Global State (20%)
• Coding: Manual Driving (50%)
• Coding: Semi-Auto Driving (30%)
• Report
• Demo video

2. Demand Analysis

(1) Basic

• Power-on and Power-off (button)
• Throttle (switch)
• Clutch (switch)
• Brake (switch) : If we turn on brake and throttle at the same time, brake should work and throttle should not work
• Reverse gear shift (switch) : When switching this switch, the clutch must keep turning on
• Turn left and turn right (button) : If no one is pressed or both are pressed, the car should go straight.
• Car Operation (to UART)
• Turn Light (LED)
• Mileage record (7 seg) : the mileage should reset to 0 when power-off

(2) Advanced - Semi-Auto Driving (30%)

• 3 states: moving, turning, wait-for-command
• the car is in moving state initially
• when a fork is detected by the four detectors, switch to wait-for-command
• we can send a command from: straight, left and right
• the command buttons are inactive in moving/turning state
• turning state should automatically switch into moving staten when the car turns 90 degrees

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• use time to estimate 90 degrees, provide a 50Hz clk
• add a cooldown between turning and going straight, cuz the car takes a short time to calibrate the orientation
• the value of 4 detectors may not change at the same time (time difference of about 40ms)