Problem with serial monitor....

Projects Programming
1

Hello,
I'm new in Arduino and I would make a chronograph to measure de speed of a ball of Airsoft ( scuze me, I'm french, my English is very bad ).
But I have a problem because the serial monitor nothing display. I'm sure that I have all connected and I have do a another program to verify the serial monitor and all running fine.
Can you help me ?
Have a good day .

////////////////////////
//
// Arduino Uno
//
////////////////////////
//
// Sketch: Chronograph
//

unsigned int data = 0;

volatile unsigned long int time1 = 0;
volatile unsigned long int time2 = 0;

void setup()
{
Serial.begin(9600);

attachInterrupt(0, sensor_1, FALLING);
attachInterrupt(1, sensor_2, FALLING);
}

void loop()
{
while ( time1 == 0 && time2 == 0 ) ;
delay(800);

if ( time1 != 0 && time2 != 0 && time2 > time1 )
{
data = 0.06 / ((time2 - time1) / 1000000.0); // v = s / t
}
else
{
data = 0;
}

Serial.println(data);

time1 = 0;
time2 = 0;
}

void sensor_1()
{
if ( time1 == 0 )
{
time1 = micros();
}
}

void sensor_2()
{
if ( time2 == 0 )
{
time2 = micros();
}
}

//
// End
//
///////////////////////

2

there is a forum in French if you don't feel comfortable in English
.
Please correct your post above and add code tags around your code:
[code]`` [color=blue]// your code is here[/color] ``[/code].

It should look like this:// your code is here
(Also press ctrl-T (PC) or cmd-T (Mac) in the IDE before copying to indent your code properly)

what are your sensors? should they be declared as INPUT_PULLUP?
why do you have    delay(800);it's useless and you might get new interrupts
you should do your math for data in a critical section, blocking the interrupts alternatively, if you are sure that sensor2 is always after sensor1, you could do the math within sensor2 ISR.

are you 2 sensors are 6cm apart?data = 0.06 / ((time2 - time1) / 1000000.0); // v = s / t
you might want to make data a float or an unsigned long and simplify the maths to perform integer maths data = 60000UL / (time2 - time1); // vitesse = distance / temps = 0.06 / ((time2 - time1) / 1000000.0);

3

Thank you for your message, I have not very good understand, I'm going in the french server,
Thank you very much.

4

quantum_0's thread in the French language forum section:
https://forum.arduino.cc/index.php?topic=648603