Exit a for loop

Projects General Guidance
1

I am using a gyroscope sensor. When I rotate the sensor it turns the led on or off. With the following code:

  if (normAccel.XAxis > 1) {
    digitalWrite(led, HIGH);
  }
    
  else if (normAccel.XAxis < 1) {
    digitalWrite(led, LOW);
  }

My problem comes when I place a for loop. If I rotate the sensor, the led does not turn on or off until the loop ends. My code is:

  if (normAccel.XAxis > 1) {
    digitalWrite(led, HIGH);
    digitalWrite(dirPin, HIGH);
    for (int i = 0; i < stepsPerRevolution; i++) {
      digitalWrite(stepPin, HIGH);
      delayMicroseconds(600);
      digitalWrite(stepPin, LOW);
    }
  }
    
  else if (normAccel.XAxis < 1) {
    digitalWrite(led, LOW);
    digitalWrite(dirPin, LOW);
    for (int i = 0; i < stepsPerRevolution; i++) {
      digitalWrite(stepPin, HIGH);
      delayMicroseconds(600);
      digitalWrite(stepPin, LOW);
    }
  }

**Simply put, I want the loop to break. **

I tried the following code, but it didn't work:

if (normAccel.XAxis > 1) {
    digitalWrite(led, HIGH);
    digitalWrite(dirPin, HIGH);
    for (int i = 0; i < stepsPerRevolution; i++) {
      digitalWrite(stepPin, HIGH);
      delayMicroseconds(600);
      digitalWrite(stepPin, LOW);
      if (normAccel.XAxis < 1) {
        break; //With this I get an error: "Break statement not within loop or swich"
        return 1;
      }
    }
  }
2

Don't put a return immediately after a break - it won't be executed.

error: "Break statement not within loop or swich"

Your compiler has serious problems if it can't spell correctly.

3

I honestly didn't understand your answer. Do you know the solution to my problem? I want to break the loop.

4

This:

uint8_t someVariable;
uint8_t led = 13;
uint8_t dirPin = 12;
uint8_t stepPin = 11;
uint8_t someOtherVariable = 10;
uint8_t stepsPerRevolution;

void setup() {
  
}
  
 void loop() {

  if (someVariable > 1) {
    digitalWrite(led, HIGH);
    digitalWrite(dirPin, HIGH);
    for (int i = 0; i < stepsPerRevolution; i++) {
      digitalWrite(stepPin, HIGH);
      delayMicroseconds(600);
      digitalWrite(stepPin, LOW);
      if (someOtherVariable < 1) {
        break; //With this I get an error: "Break statement not within loop or swich"
        return 1;
      }
    }
  }
}

Compiles.

I had to invent some variables to replace the ones you didn't post in the code you didn't show us. I conclude that if your code does not compile then the problem is in the secret part.

Please read How to get the best out of this forum, especially the bit about posting all your code.

Thank you.

5

raym3d:
I honestly didn't understand your answer. Do you know the solution to my problem? I want to break the loop.

If the compiler error message really included the word "swich", you have got problems beyond the scope of this forum.

If you can't cut and paste a real error message, then maybe you can't cut and paste your actual code that you say caused it.

6

It was my mistake to explain. Excuse me. I already tried, when I put the following I did not get any error:

if (normAccel.XAxis > 1) {
    digitalWrite(led, HIGH);
    digitalWrite(dirPin, HIGH);
    for (int i = 0; i < stepsPerRevolution; i++) {
      digitalWrite(stepPin, HIGH);
      delayMicroseconds(600);
      digitalWrite(stepPin, LOW);
      if (normAccel.XAxis < 1) {
        break;
      }
    }
   }

The problem is that the break is not executed. That is, first end the loop and then execute the next line. I want to end the loop before the loop ends only if I rotate the sensor.

If I remove the loop if it works with the led.

7

The problem is that the break is not executed.

How do you know?

Have you read the forum instructions yet?

8

PerryBebbington:
How do you know?

Have you read the forum instructions yet?

I'm going to read it. Thanks for your help on my problem.

9

In your snippet:

if (normAccel.XAxis > 1) 
{
    digitalWrite(led, HIGH);
    digitalWrite(dirPin, HIGH);
    for (int i = 0; i < stepsPerRevolution; i++) 
    {
        digitalWrite(stepPin, HIGH);
        delayMicroseconds(600);
        digitalWrite(stepPin, LOW);
        
        if (normAccel.XAxis < 1) 
        {
            break;
        }
    }
}

How is normAccel updated? You get in with the condition "if (normAccel.XAxis > 1)" and want to get out on the condition that "if (normAccel.XAxis < 1)":

Is there unseen interrupt-driven code updating normAccel behind the scenes? If not, as far as the code is concerned normAccel.XAxis will always be > 1.