Arduino Nano + 9V battery + M-1503 Servo = panoramic timelapse rotator-phone holder.

Timelapse_servo

#include <Servo.h>

float TIMELAPSE_SPEED = 5; // N:1
long COOLDOWN = 2000 * TIMELAPSE_SPEED;
long CYCLE = 20000 * TIMELAPSE_SPEED;

long ANGLE_MIN = 45;
long ANGLE_MAX = 135;
long angleRange = ANGLE_MAX - ANGLE_MIN;

long LED_FLASH_RATIO_1 = 500;
long LED_FLASH_RATIO_2 = 1000;

Servo myservo;

int pinLED = 13;
int pinServo = 11;

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

long msec = 0;
double ms = 0;

void setup() {
  pinMode(pinLED, OUTPUT);
  myservo.attach(pinServo);  // attaches the servo on pin 9 to the servo object
  servoWrite(ANGLE_MAX);
  Serial.begin(9600);
}

void loop() {
  msec = millis() % (2*CYCLE + 2*COOLDOWN);
  
  if (msec < COOLDOWN || (COOLDOWN + CYCLE < msec && msec < COOLDOWN*2 + CYCLE)) {
    flashLed(msec, LED_FLASH_RATIO_1);
    Serial.println("Cooldown");
    return;
  }

  flashLed(msec, LED_FLASH_RATIO_2);
  rotateServo(msec);
}

void flashLed(int currentMillis, int ratio) {
  if (currentMillis % ratio < ratio / 2) {
      digitalWrite(pinLED, HIGH);   // turn the LED on (HIGH is the voltage level)
  } else {
      digitalWrite(pinLED, LOW);    // turn the LED off by making the voltage LOW
  }
}

void rotateServo(double msec) {
  if(msec < COOLDOWN + CYCLE) {
    msec = msec - COOLDOWN; 
    pos = ANGLE_MIN + (CYCLE-msec)/CYCLE*angleRange;
  } else {
    msec = msec - COOLDOWN - CYCLE - COOLDOWN;
    pos = ANGLE_MIN + msec/CYCLE*angleRange;
  }

  if(lastPos == pos) return;
  lastPos = pos;

  servoWrite(pos);
}

void servoWrite(int pos) {
  pos = minMaxVal(pos, ANGLE_MIN, ANGLE_MAX);
  
  Serial.print("Servo.write: "); 
  Serial.println(pos);
  
  myservo.write(pos);              // tell servo to go to position in variable 'pos'
}

int minMaxVal(int val, int minimum, int maximum) {
  return min(max(val, minimum), maximum);
}