Code for the Arc-O-Matic - http://rasterweb.net/raster/projects/arcomatic/

ArcOMatic

/*
 * ArcOMatic
 *
 * pete@rasterweb.net
 * http://rasterweb.net/raster/
 *
 */

#include <Servo.h>

Servo ServoB;
Servo ServoL;

int total = 0;

void setup() {
  Serial.begin(57600);
  pinMode(13, OUTPUT);
  ServoB.attach(9);
  ServoL.attach(10);
  Serial.println("Start");
  ServoB.write(90);
  ServoL.write(90);
  digitalWrite(13, HIGH);
  delay(4000);
  digitalWrite(13, LOW);
  delay(4000);
  // set to home
  for (int ctmp = 90; ctmp >= 45; ctmp -= 1) {
    ServoB.write(ctmp);
    delay(20);
  }
  for (int ctpm = 90; ctpm <= 180; ctpm += 1) {
    ServoL.write(ctpm);
    delay(20);
  }
  
  Serial.println("homed");
  
  delay(10000);
}


void loop() {

  int ctservobig = 55;

  while (ctservobig < 125) {

    ServoB.write(ctservobig);

    if ((ctservobig >= 55) and (ctservobig < 59)) {
      swinglittle(180, 75);
    }
    if ((ctservobig >= 60) and (ctservobig < 74)) {
      swinglittle(180, 45);
    }
    if ((ctservobig >= 75) and (ctservobig < 89)) {
      swinglittle(180, 10);
    }
    if ((ctservobig >= 90) and (ctservobig < 104)) {
      swinglittle(180, 10);
    }
    if ((ctservobig >= 105) and (ctservobig < 117)) {
      swinglittle(185, 10);
    }
    if ((ctservobig >= 118) and (ctservobig < 125)) {
      swinglittle(185, 10);
    }


    ctservobig = ctservobig + 3;

   delay(50);

  }



  delay(2000);
  
  
  // reset to home
  for (int ctmp = 125; ctmp >= 90; ctmp -= 1) {
    ServoB.write(ctmp);
    delay(50);
  }
  for (int ctpm = 105; ctpm >= 90; ctpm -= 1) {
    ServoL.write(ctpm);
    delay(50);
  }


  // if (total > 100) {
  // loops forever... END!
  while(1) {
    digitalWrite(13, HIGH);
    delay(1000);
    digitalWrite(13, LOW);
    delay(1000);
    //}
  }

  total++;

}


void swinglittle(int posHigh, int posLow) {

  for (int ctsl = posHigh; ctsl >= posLow; ctsl -= 2) {
    ServoL.write(ctsl);
    delay(50);
  }
  for (int ctsl = posLow; ctsl <= posHigh; ctsl += 2) {
    ServoL.write(ctsl);
    delay(50);
  }

}