Can you time when x increments within a for() loop? (Beginner)

[merijang27]

I've tried to implement millis(); like such down below, but each variation failed.

void ledMode(byte mode)
{
    unsigned long currentTime = millis();
    if (currentTime - previousTime >= Interval)
    {
        switch (mode)
        {
        case 1:
            digitalWrite(RLED, HIGH); //Red
            digitalWrite(BLED, LOW);
            digitalWrite(GLED, LOW);
            Serial.println("Red!");
            previousTime = currentTime;
            break;

        case 2:
            digitalWrite(RLED, LOW);  //Green
            digitalWrite(BLED, LOW);
            digitalWrite(GLED, HIGH);
            Serial.println("GREEN!");
            previousTime = currentTime;
            break;

        case 3:
            digitalWrite(RLED, LOW);  //blue
            digitalWrite(BLED, HIGH);
            digitalWrite(GLED, LOW);
            Serial.println("BLUE!");
            previousTime = currentTime;
            break;

        case 4:
            digitalWrite(RLED, HIGH);  //orange
            digitalWrite(BLED, LOW);
            digitalWrite(GLED, HIGH);
            Serial.println("ORANGE!");
            previousTime = currentTime;
            mode = 5;
            break;

        case 5:
            digitalWrite(RLED, LOW);  //teal
            digitalWrite(BLED, HIGH);
            digitalWrite(GLED, HIGH);
            Serial.println("TEAL!");
            previousTime = currentTime;
            break;
        case 6:
            digitalWrite(RLED, HIGH); //purple
            digitalWrite(BLED, HIGH);
            digitalWrite(GLED, LOW);
            Serial.println("PURPLE!");
            previousTime = currentTime;
            break;

        case 7:
            digitalWrite(RLED, HIGH); //white
            digitalWrite(BLED, HIGH);
            digitalWrite(GLED, HIGH);
            Serial.println("WHITE!");
            previousTime = currentTime;
            break;
        }
    }
}

void RGBoff()
{
    digitalWrite(RLED, LOW);
    digitalWrite(BLED, LOW);
    digitalWrite(GLED, LOW);
}

void loop()
{
    button();
   if (count % 2 == 1)
{
    unsigned long currentTime = millis();
    for (byte x = 1; x < 8;)
    {
        ledMode(x);
        if (currentTime - previousTime >= Interval)
        {
            Serial.println(x);
            previousTime = currentTime;
            x++;
        }
    }   
}
}

I'd like x to increment every 1000 milliseconds...

Any help or suggestions would be greatly appreciated! Li-ion Battery

[UKHeliBob]

The speed at which the for loop executes in your code snippet is not controlled by millis() and it is not normal to change the value of a for loop control variable within the for loop

If you want a series of actions to take place at intervals then use millis() to time the intervals and let loop() do the looping. No for loop is needed

[Grumpy_Mike]

In answer to your question in the title the answer is no. But I suspect you don’t want to do this. The loop index, here called x increments at the end of the for loop.

You could simply put a delay of the appropriate value in the loop but that would cause blocking code which may or may not be a problem with what you are trying to do.

[iamzain]

millis() function is not implementation function in this code, it is the function call.