107 lines
1.9 KiB
C++
107 lines
1.9 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 "elapsedMillis.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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elapsedMillis timeElapsed;
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#define PIN_RESET 2
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#define PIN_CAR1 3
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typedef struct {
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short pin;
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unsigned int elapsedTime;
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} CarTimer;
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#define PIN_CAR_STARTING 3
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#define CAR_COUNT 1
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CarTimer 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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lcd.begin(20, 4);
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lcd.backlight();
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}
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void resetCarTimers() {
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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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lcd.clear();
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for(short i=0; i<CAR_COUNT; i++) {
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lcd.setCursor(0,i);
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sprintf(buffer, "Car %d: %dms", i+1, cars[i].elapsedTime);
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lcd.print(buffer);
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}
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}
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unsigned int startTime; // start time in ms
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unsigned int elapsedTime;
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bool started = false;
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bool allDone;
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void loop()
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{
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if (digitalRead(PIN_RESET) == LOW) {
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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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started = false;
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resetCarTimers();
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digitalWrite(LED_BUILTIN, LOW);
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} else {
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// if we just started, record current millis counter
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if (!started) {
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startTime = timeElapsed;
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started = true;
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}
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// calculate elapsed time in ms
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elapsedTime = timeElapsed - startTime;
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allDone = true;
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for(short i = 0; i<CAR_COUNT; i++) {
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if (cars[0].elapsedTime == 0) {
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if (digitalRead(cars[i].pin) == LOW) {
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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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if (allDone) {
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displayTimers();
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}
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}
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} |