154 lines
3.3 KiB
C++
154 lines
3.3 KiB
C++
/*
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* Blink
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* Turns on an LED on for one second,
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* then off for one second, repeatedly.
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*/
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#include "Arduino.h"
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#include <Wire.h>
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#include <LiquidCrystal_I2C.h>
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LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
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#define PIN_RESET 2
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#define PIN_CAR1 3
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#define PIN_LED LED_BUILTIN
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typedef struct {
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// input pin for this car
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short pin;
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// elapsed time for pin (0 means not finished)
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unsigned int elapsedTime;
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} Car;
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// assume all cars are on sequential digital pins
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#define PIN_CAR_STARTING 3
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// number of cars (4 max)
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#define CAR_COUNT 2
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// array of cars
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Car cars[CAR_COUNT];
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// buffer for the LCD line
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char buffer[40];
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void setup()
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{
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Serial.begin(9600);
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pinMode(PIN_RESET, INPUT_PULLUP);
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pinMode(LED_BUILTIN, OUTPUT);
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// initialize each car PIN
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for(short i=0; i<CAR_COUNT; i++) {
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cars[i].pin = PIN_CAR_STARTING + i;
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pinMode(cars[i].pin, INPUT_PULLUP);
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}
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// initialize LCD
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lcd.begin(20, 4);
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lcd.backlight();
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lcd.setCursor(1,1);
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lcd.print("Jeff's Inept");
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lcd.setCursor(6,2);
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lcd.print("Kub Kar Timer");
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}
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void resetCars() {
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for(short i=0; i<CAR_COUNT; i++) {
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cars[i].elapsedTime = 0;
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}
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}
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void displayTimers() {
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short row = 0;
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lcd.clear();
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// keep track of cars that we've already printed a score for
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bool seenCar[CAR_COUNT];
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for (int i=0; i<CAR_COUNT; i++) {
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seenCar[i] = false;
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}
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for(short place=0; place<CAR_COUNT; place++) {
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// find which is the fastest car that hasn't already been processed
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short currentCar = -1;
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for (short i=0; i<CAR_COUNT; i++) {
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if (!seenCar[i] && cars[i].elapsedTime != 0 && (currentCar == -1 || cars[i].elapsedTime < cars[currentCar].elapsedTime)) {
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currentCar = i;
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}
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}
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// mark car as seen so we don't show the same car again
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seenCar[currentCar] = true;
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if (cars[currentCar].elapsedTime != 0) {
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// only print the score if this car finished
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lcd.setCursor(0,row++);
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sprintf(buffer, "%d%s: CAR%d @ %0.2fs", place+1, place==0?"st":(place==1?"nd":(place==2?"rd":"th")) , currentCar+1, cars[currentCar].elapsedTime/1000.0);
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lcd.print(buffer);
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}
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}
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}
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#define MAX_TIME 5000
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unsigned long startTime; // start time in ms
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#define STATE_READY 1
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#define STATE_RUNNING 2
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#define STATE_DONE 3
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short state = 0;
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void loop()
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{
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if (digitalRead(PIN_RESET) == LOW) {
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if (state != STATE_READY) {
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state = STATE_READY;
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lcd.clear();
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lcd.setCursor(0,0);
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lcd.print("Ready...");
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resetCars();
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digitalWrite(PIN_LED, HIGH);
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}
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} else {
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if (state == STATE_READY) {
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digitalWrite(PIN_LED, LOW);
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state = STATE_RUNNING;
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lcd.setCursor(0,0);
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lcd.print("Running!");
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startTime = millis();
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}
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if (state == STATE_RUNNING) {
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// calculate elapsed time in ms
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unsigned long elapsedTime = millis() - startTime;
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bool allDone = true;
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for(short i = 0; i<CAR_COUNT; i++) {
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if (cars[i].elapsedTime == 0) {
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if (digitalRead(cars[i].pin) == LOW) {
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// car finished, record time
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cars[i].elapsedTime = elapsedTime;
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} else {
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allDone = false;
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}
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}
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}
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// stop race if all cars are done or MAX TIME exceeded
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if (allDone || elapsedTime > MAX_TIME) {
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state = STATE_DONE;
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displayTimers();
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}
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}
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}
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} |