Reset of variable to 0 (zero) not working

Using Arduino Programming Questions
#1

I'm trying to create a loop that counts from 5000 to 5000 and after reaching a certain value (30000) turns to zero. Here's the code

int time = 0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (time > 30000) {
    time = 0;
    Serial.println(time);
  }
  time = time + 5000;
  Serial.println(time);
  delay(5000);
}

However, the reseting of the variable time is not working:
Desired output Actual output
0 0
5000 5000
10000 10000
15000 15000
20000 20000
25000 25000
30000 30000
0 -35000
5000 -30000
... ...
How do I fix this?

#2

You didn’t specify which Arduino board you’re using. I’ll assume an Uno or Mega. On those 8-bit AVR-based boards, an ‘int’ is 16 bits. The largest signed value you can hold in 16 bits is 2^15-1 = 32767.

#3

Better to use a “for” loop with steps of 5000.

for (int time = 0; time <= 30000; time += 5000) {
  Serial.println(time);
}
#4

See if this works:

int time = 0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (time >= 30000) { //<<<<<<<
    time = 0;
    Serial.println(time);
  }
  time = time + 5000;
  Serial.println(time);
  delay(5000);
}
#5

Karma for using code tags on your first post. Thanks for reading the forum guidelines without being asked. Most first time posters do not bother.

#6