Hello World!

Welcome back to another Unicorn ClockWorks Instructable. Here, we will be setting up and interfacing a servo motor to the Arduino and controlling it using a push button switch. The servo motor is a very popular and useful tool among hobbyist and I am sure you will find yourself needing to use it in numerous occasions. As such, we will be learning how to interface control it!

This is made to be broad ranging and generic so you can apply it to any projects with any microcontroller!

Step 1: Materials

Arduino or any Arduino-compatible microcontroller
Servo motor
Push button switch
10k Ohm Resistor - brown-black-orange

Step 2: Push Button Connections

1a

The Black wire connects pin 1 of the switch (on the left hand side) to the GND pin on the Arduino.
The Yellow wire connects pin 2 of the switch (on the right-hand side) to pin 8 on the Arduino.
Connect a 10kΩ resistor -- brown-black-orange -- to pin 2 and the other terminal to the 3.3V pin on the Arduino.

Step 3: Servo Connections

2a

The Blue wire is connected from the signal pin of the servo motor to pin 3 of the Arduino.
The Red wire is connected from the signal pin of the servo motor to the 5V pin of the Arduino
The Black wire is connected from the ground pin of the servo motor to the GND pin of the Arduino. Note that the switch is also connected here. so we can also connect it there on the breadboard, but the Arduino has multiple GNDs that are all common.

Step 4: Code

#include <Servo.h>;

 
 // pushbutton pin
 const int buttonPin = 8;

 // servo pin
 const int servoPin = 3;
 Servo servo;

//create a variable to store a counter and set it to 0
int counter = 0;
void setup()
{
  servo.attach (servoPin);
  
  // Set up the pushbutton pins to be an input:
  pinMode(buttonPin, INPUT);
}

void loop()
{
 // local variable to hold the pushbutton states
  int buttonState;

  //read the digital state of buttonPin with digitalRead() function and store the           //value in buttonState variable
  buttonState = digitalRead(buttonPin);

  //if the button is pressed increment counter and wait a tiny bit to give us some          //time to release the button
  if (buttonState == LOW) // light the LED
  {
    counter++;
    delay(150);
  }

  if(counter == 0)
    servo.write (20);  // zero degrees
  else if(counter == 1)
    servo.write(90);
  else if(counter == 2)
    servo.write (150); 
  else if(counter == 3)  
    servo.write (180);
  //else reset the counter to 0 which resets thr servo to 0 degrees
  else
   counter = 0;
}