Adjusting simple (so it should be) shift register coding for a different result

Projects Programming
4

vjpcat:

Try:

 #include <Servo.h>
 
int potPin = 0;
int servoPin = 9;
Servo servo;
int latchPin = 5;
int clockPin = 6;
int dataPin = 4;
int leds = 0;
 
void setup() {
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT);  
  pinMode(clockPin, OUTPUT);
  servo.attach(servoPin);
}
 
void loop(){
  int reading  = analogRead(potPin);   // 0 to 1023
  int angle = reading / 6;  //0 to 100-ish
  servo.write(angle);
  int numLEDSLit = reading / 228;  //You only want max. 4 LEDs lit.
  leds = 0;
  if (angle >= 55){  //positive half of turn
    for (int i = 4; i < (numLEDSLit+4); i++){
       bitSet(leds, i);    // lights LEDs 4 to 7
    }
  }
  else if (angle<=45){  //negative half of turn
    for (int i = (numLEDSLit -1) ; i >-1; i--){
       bitSet(leds, i);
    }     // lights LEDs 3 to 0
 }
// angles between 46 and 54 (centre of turn) will have no LEDs lit
updateShiftRegister();
}
 
void updateShiftRegister(){
   digitalWrite(latchPin, LOW);
   shiftOut(dataPin, clockPin, LSBFIRST, leds);
   digitalWrite(latchPin, HIGH);
}

Also look at the map function.