Programming Ping))) sensor and motor controller

Using Arduino Programming Questions
1

Something has gone wrong and I can't find it. Can you help me? Here is my code

int brakePin = 9;
int brakePinb = 8;
int pwmPin = 3;
int pwmPinb = 11;
int directionPin = 12;
int directionPinb = 13;

const int pingPin = 7;

void setup() {
// initialize serial communication:
Serial.begin(9600);
}

void loop()
{
long duration, inches, cm;

pinMode(pingPin, OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(5);
digitalWrite(pingPin, LOW);

pinMode(pingPin, INPUT);
duration = pulseIn(pingPin, HIGH);

inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);

if (inches < 6)
{
digitalWrite(brakePin, HIGH);
digitalWrite(brakePinb, HIGH);
}
else
{
digitalWrite(brakePin, LOW);
digitalWrite(brakePinb, LOW);
digitalWrite(pwmPin, 150);
digitalWrite(pwmPinb, 150);
digitalWrite(directionPin, HIGH);
digitalWrite(directionPinb, HIGH);
}

Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();

delay(100);
}

long microsecondsToInches(long microseconds)
{
return microseconds / 74 / 2;
}

long microsecondsToCentimeters(long microseconds)
{
return microseconds / 29 / 2;
}

Thanks, Tim4tech

2

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3

Something has gone wrong

And we've got to guess what it is?

I guess all those missing "pinMode"s - I don't see waggling a few pullup resistors is going to do much good.