PIA's DES242 MACHINE metronomic-transcendential device

connecting the motor & little display to each other.
trying to mimic realistic pendulum movement. Just very lazily...


 LIBRARIES
#include Servo.h
#include Wire.h
#include Adafruit_GFX.h
#include SPI.h
#include Adafruit_SSD1306.h

 lcd pins, object & variables
#define SCREEN_WIDTH 128  OLED display width, in pixels
#define SCREEN_HEIGHT 32  OLED display height, in pixels
#define OLED_RESET     -1  Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C  See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32

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

String countingWords[20] = {
  one, two, three, four,  englitch
  tahi, rua, toru, wha,  te reo
  eins, zwei, drei, vier,  german
  akhat, shta'im, shalosh, arba,  hebrew
  0001, 0010, 0011, 0100};  binary
 index variable display starts @ modulo over to one.
int wordIndex = sizeof(countingWords) - 1; 

 servo obj. & variables
Servo myServo;
const int SERVO_PIN = 8;

int centre = 155;
int angle = 45;
int speed = 7;
int offset = 20;
int waitForChange = 490;
int count = 0;


void setup() {
   initializing the serial & little display.
  Serial.begin(9600);

  little.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
  little.clearDisplay();

  myServo.attach(SERVO_PIN);
  myServo.write(centre);

  Serial.println(START!);
}


void loop() {
   move to LEFT from CENTER.
  for (int i = centre; i = centre + angle; i++) { 
    moveServo(i);
     change text before end of rotation - looks better!
    if (i == centre + angle - offset) {
      changeLittleScreen();
    }
  }
  delay(waitForChange);  delay to switch sides.
  
   moving to CENTER from LEFT.
  for (int i = centre + angle; i = centre; i--) { 
    moveServo(i);
  }

   moving to RIGHT from CENTER.
  for (int i = centre; i = centre - angle; i--) { 
    moveServo(i);
    
    if (i == centre - angle + offset) { 
      changeLittleScreen();
    }
  }
  delay(waitForChange); 
  
   moving to CENTER from RIGHT.
  for (int i = centre - angle; i = centre; i++) { 
    moveServo(i);
  }
}

void changeLittleScreen() {
  incrementWordIndex();
  count++;
  little.clearDisplay();

   draw WHITE TEXT in the top-left corner
  little.setTextSize(3);             
  little.setTextColor(SSD1306_WHITE);         Draw white text
  little.setCursor(0, 0);
  little.println(countingWords[wordIndex]);

  little.display();
}

void incrementWordIndex() {
  wordIndex = (wordIndex + 1) % ((sizeof(countingWords))  sizeof(countingWords[0]));
}

void moveServo(int angle) {
  myServo.write(angle);
  delay(speed);
}