PWM Code with delays

Projects General Guidance
1

I wrote the following code the allow a line follower robot to make a gradual turn for a certain amount of time. the gradual turn works without a delay but as soon as I add it in it no longer works and the robot goes straight................ any advice?

/*
PWM with delay
*/
int speed = 1;
void setup() {
pinMode(11, OUTPUT);
pinMode(5, OUTPUT);
}

void loop() {
speed = digitalRead(5);
speed = speed*(55/255);
digitalWrite(5, speed);
digitalWrite(5, HIGH);
digitalWrite(11, HIGH);
delay(3000);

2

Try walking around by closing your eyes for three seconds at a time, and then opening them for about 300 microseconds.

Let is know how that works, should you survive long enough.

    pinMode(5, OUTPUT);
}

void loop() {
    speed = digitalRead(5);

Please explain.

3

Let's run your code on paper:

//first time through loop()
    speed = digitalRead(5);  // output pin 5 defaults to LOW after pinMode
    speed = speed*(55/255); // speed is now 0 (LOW) (0*(55/255))
    digitalWrite(5, speed);  // write 5 LOW
    digitalWrite(5, HIGH);  // write 5 HIGH
    digitalWrite(11, HIGH); // write 11 HIGH
    delay(3000);              // wait 3 sec.
//next time through loop()
    speed = digitalRead(5);  // speed = HIGH
    speed = speed*(55/255);  // speed = 1*(55/255)  
    digitalWrite(5, speed);  // since speed is non zero write 5 HIGH
    digitalWrite(5, HIGH);  // write 5 HIGH
    digitalWrite(11, HIGH);  // write 11 HIGH
    delay(3000);              // wait 3 sec.
// third time through loop()
    speed = digitalRead(5);  // speed = HIGH
    speed = speed*(55/255);  // speed = 1*(55/255)  
    digitalWrite(5, speed);  // since speed is non zero write 5 HIGH
    digitalWrite(5, HIGH);  // write 5 HIGH
    digitalWrite(11, HIGH);  // write 11 HIGH
    delay(3000);              // wait 3 sec.
// and so on.  Pin 5 is never low after the first time through loop

    speed = speed*(55/255);  
    digitalWrite(5, speed);

The analogWrite() function is for PWM.