Driving Servo Motor using Push Buttons and Potentiometer

        To drive the servo, two push buttons and a potentiotemers is being used. Push Buttons are for increasing/decreasing the speed/delayTime of the servo whereas the potentiometer is in charge to manipulate direction/location of the servo.

        The circuit diagrams (one made on digital environment, the other one is the implemented) and the datasheet of shift register can be seen below:

Digital Drawed Circuit

Implemented Circuit

      

Here is a video available to see the outputs and how the system works:

Arduino Code :

/*
  Can KAVALOĞLU
*/

#include <Servo.h> 
Servo myservo;

int potPin = 0;
int bttn1Pin = 10;
int bttn2Pin = 11;
int potValue, bttn1Value, bttn2Value, delayTime = 15;

void setup(){
    pinMode(potPin, INPUT);
    pinMode(bttn1Pin, INPUT);
    pinMode(bttn2Pin, INPUT);    
    myservo.attach(9);  // attaches the servo on pin 9 to the servo object 
    Serial.begin(9600);
}

void loop(){
  bttn1Value = digitalRead(bttn1Pin);
  bttn2Value = digitalRead(bttn2Pin);
  potValue = analogRead(potPin);
  potValue = map(potValue, 0, 1023, 0, 180);
  
  if(bttn1Value == HIGH && bttn2Value == LOW){
      if(delayTime > 5)
        delayTime -= 5;
  }
  else if(bttn1Value == LOW && bttn2Value == HIGH){
        delayTime += 5;
  }
  
  myservo.write(potValue);
  Serial.println(potValue);
  delay(delayTime);
}