title: Evaluate if a value is increasing or decreasing (arduino)
body: <p>I'm trying to learn how to evaluate if a value is increasing or decreasing. In this case I'm using a potentiometer mapped from 0 - 14. Basically I need it to look at the current value, and if the current value is increasing print one thing, and if the value is decreasing print something else. </p>
  
  <p>Here's what I have so far, I know its not right, but its a start.</p>
  
  <p>Thoughts?</p>
  
  <p>Thank you. </p>
  
  <pre><code>void setup() { 
    Serial.begin(9600);  
  }
  
  
  void loop() {
  
    int val = analogRead(A0);  // read the input on analog pin 0:
    val = map(val, 0, 1023, 0, 14); // map the vlaues to new values
    Serial.println(val); // print those values
    delay(1); // delay by a second.
  
    // sudo code
  
    if (val++) {
  
      Serial.println("up");
  
    } else if (val--){
  
      Serial.print("down");
  
    }else{
  
      // do nothing
    }
  }// end loop
  </code></pre>