Hello. I've been trying to use the code below for a reaction timer. The LED is supposed to flash randomly, and then when the user presses the button, the time it took them to press the button is supposed to be printed onto the serial monitor. However, the elapsed time seems to be printing to the serial monitor without the button having been pressed.
int switchPin = 2;
int ledPin = 13 ;
boolean lastButton = LOW;
boolean currentButton = LOW;
boolean Started = false;
boolean timer = false;
long startTime;
long endTime;
long randomTime;
float elapsedTime;
void setup()
{
pinMode(switchPin, INPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
boolean debounce(boolean last)
{
boolean current = digitalRead(switchPin);
if(last != current)
{
delay(5);
current = digitalRead(switchPin);
}
return current;
}
void loop()
{
currentButton = debounce(lastButton);
if(lastButton == LOW && currentButton == HIGH)
{
Started = !Started;
lastButton = HIGH;
}
lastButton = currentButton;
if(Started == true && timer == false)
{
Random();
timer = true;
}
if(Started == false && timer == true)
{
Stop();
timer = false;
}
}
void Random()
{
randomTime = random(4,10);
randomTime = randomTime*1000;
digitalWrite(ledPin, HIGH);
delay(100);
digitalWrite(ledPin, LOW);
delay(randomTime);
Start();
}
void Start(){
startTime = millis();
digitalWrite(ledPin, HIGH);
}
void Stop(){
endTime = millis();
elapsedTime = (endTime - startTime)+5;
elapsedTime = elapsedTime/1000;
Serial.print("Time Seconds: ");
Serial.println(elapsedTime);
digitalWrite(ledPin, LOW);
}
}
I was wondering what I needed to change in order to fix that problem. Any advice is appreciated! Thank you.