Hello.
We´re 15 years old spanish students and we are trying to construct an automatic arduino timer for our line follower robots. We have all the haradware. A laser diode send light to the ldr, and a lcd display 2x16 show the results, and the best lap. We find the code at - YouTube, but we caný read the times.... Can you find the code error, please?
many thanks!!!!
/* Single lane slot car timer
Written by TheInsanityUnleashed @ Youtube
----------------------------------------------------
PhotoR 10K
+5 o---/\/\/--.--/\/\/---o GND
|
Pin A0 o----------
Pin 9 ------Piezo-----gnd
Sensitivity Pot --------- Pin A1
----------------------------------------------------
*/
#include <LiquidCrystal.h>
//variables
const byte lightPin = 0;
const byte speakerPin = 9;
int lightSensor = 0;
unsigned long lapMillis = 0;
unsigned long startMillis = millis();
unsigned long bestMillis = 9999999;
float lapTime = 0.00;
float bestLap = 0.00;
boolean firstTrigger = true;
boolean newBest = false;
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup()
{
lcd.begin(16, 2);
lcd.setCursor(0, 0);
lcd.print("Start! ");
Serial.begin(9600);
pinMode(speakerPin, OUTPUT);
digitalWrite(speakerPin, LOW);
}
void loop()
{
//reading from light sensor
lightSensor = analogRead(lightPin);
//If car detected
if(lightSensor < analogRead(1)){
//determine lap time in milliseconds
lapMillis = millis() - startMillis;
startMillis = millis();
lapTime = lapMillis / 1000.00;
//if firs trigger print race started
if (firstTrigger == true){
lcd.setCursor(0, 0);
lcd.print("Race Started! ");
}
//print if not first trigger
if (firstTrigger != true){
Serial.print("lapTime: ");
Serial.println(lapTime);
Serial.print("lapMillis: ");
Serial.println(lapMillis);
//print lap time
lcd.setCursor(0, 0);
lcd.print("Last: ");
lcd.print(lapTime);
lcd.print(" ");
}
//if last lap is better than best lap
if(lapMillis < bestMillis && firstTrigger != true)
{
bestMillis = lapMillis;
bestLap = lapTime;
Serial.print("bestLap: ");
Serial.println(bestLap);
//print best lap time
lcd.setCursor(0, 1);
lcd.print("Best: ");
lcd.print(bestLap);
lcd.print(" ");
newBest = true;
}
//beep piezo
if(newBest == true)
{
digitalWrite(speakerPin, HIGH);
delay(25);
digitalWrite(speakerPin, LOW);
delay(25);
digitalWrite(speakerPin, HIGH);
delay(25);
digitalWrite(speakerPin, LOW);
delay(25);
digitalWrite(speakerPin, HIGH);
delay(25);
digitalWrite(speakerPin, LOW);
delay(25);
digitalWrite(speakerPin, HIGH);
delay(25);
digitalWrite(speakerPin, LOW);
newBest = false;
}
else
{
digitalWrite(speakerPin, HIGH);
delay(150);
digitalWrite(speakerPin, LOW);
}
firstTrigger = false;
Serial.println("----------------");
}
}
Moderator edit:
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tags added.
