Libraries and Servomotors

Libraries are one of the things that give Arduino their superpowers.

#include <Servo.h>

Servo myservo; // create servo object to control a servo

// twelve servo objects can be created on most boards

int pos = 0; // variable to store the servo position

void setup() {

myservo.attach(9); // attaches the servo on pin 9 to the servo object

}

void loop() {

for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees

// in steps of 1 degree

myservo.write(pos); // tell servo to go to position in variable 'pos'

delay(15); // waits 15 ms for the servo to reach the position

}

for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees

myservo.write(pos); // tell servo to go to position in variable 'pos'

delay(15); // waits 15 ms for the servo to reach the position

}

}

#include <Servo.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

// Define OLED screen dimensions

#define SCREEN_WIDTH 128 // OLED display width, in pixels

#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)

// The pins for I2C are defined by the Wire-library.

// On an arduino UNO:       A4(SDA), A5(SCL)

#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)

#define SCREEN_ADDRESS 0x3C // Typical I2C address for 128x64 and 128x32 OLEDs

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

Servo myservo;  // create servo object to control a servo

int potpin = A0;  // analog pin used to connect the potentiometer

int val;          // variable to read the value from the analog pin

void setup() {

 myservo.attach(9);  // attaches the servo on pin 9 to the servo object

  // Initialize the OLED display

 // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally

 if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {

   // If the display fails to initialize, the code will halt here

   for(;;);

 }

 // Clear the display buffer and set initial text properties

 display.clearDisplay();

 display.setTextColor(SSD1306_WHITE);

 display.display();

}

void loop() {

 val = analogRead(potpin);            // reads the value of the potentiometer (0 to 1023)

 val = map(val, 0, 1023, 0, 180);     // scale it for use with the servo (0 to 180)

  myservo.write(val);                  // sets the servo position

 // --- OLED Update Section ---

 display.clearDisplay();              // Clear the previous frame

  // Print "Angle:" label

 display.setTextSize(1);              // Normal 1:1 pixel scale

 display.setCursor(0, 0);             // Start at top-left corner

 display.print("Servo Angle:");

 // Print the actual angle value

 display.setTextSize(3);              // Scale up the text for the number

 display.setCursor(0, 20);            // Move the cursor down

 display.print(val);

  // Print a degree symbol (ASCII character 247 in standard Arduino fonts)

 display.print((char)247);           

  display.display();                   // Push the drawn buffer to the screen

 // ---------------------------

 delay(15);                           // waits for the servo to get there

}