When Wizzy guards the Halloween candy bowl at our house, I use an RC transmitter / receiver - which allows me to interact 'personally' with trick-or-treaters.

Electronically, Wizzy is pretty simple... two servos and an audio trigger.

This setup will perform a tail-wag, head movement, and offer a snarky comment. Make sure to use a 5V power supply that can provide a constant 2 AMPs or better.

You can use just about any Arduino compatible!

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#include <Servo.h>

// head and tail servo objects
Servo head;
Servo tail;

// variables used to track the position of the head and tail servos
int hpos = 0;
int tpos = 0;

void setup() {
  // attach head and tail servo to digital pins 9 and 10 respectively
  head.attach(9);
  tail.attach(10);
}

void loop() {

  delay(5000);

  // wag the tail back and forth - adjust range as needed
  for (tpos = 0; tpos <= 180; tpos += 1) {
    tail.write(tpos);
    delay(15);
  }
  for (tpos = 180; tpos >= 0; tpos -= 1) {
    tail.write(tpos);
    delay(15);
  }

  delay(5000);

  // rotate head left and right - adjust range as needed
  for (hpos = 0; hpos <= 180; hpos += 1) {
    head.write(hpos);
    delay(15);
  }
  for (hpos = 180; hpos >= 0; hpos -= 1) {
    head.write(hpos);
    delay(15);
  }

  delay(5000);

  // trigger random audio playback
  analogWrite(0, -255);
  delay(15);
  analogWrite(0, 0);
}

#include <Servo.h>

// head and tail servo objects
Servo head;
Servo tail;

// variables used to track the position of the head and tail servos
int hpos = 0;
int tpos = 0;

void setup() {
  // attach head and tail servo to digital pins 9 and 10 respectively
  head.attach(9);
  tail.attach(10);
}

void loop() {

  delay(5000);

  // wag the tail back and forth - adjust range as needed
  for (tpos = 0; tpos <= 180; tpos += 1) {
    tail.write(tpos);
    delay(15);
  }
  for (tpos = 180; tpos >= 0; tpos -= 1) {
    tail.write(tpos);
    delay(15);
  }

  delay(5000);

  // rotate head left and right - adjust range as needed
  for (hpos = 0; hpos <= 180; hpos += 1) {
    head.write(hpos);
    delay(15);
  }
  for (hpos = 180; hpos >= 0; hpos -= 1) {
    head.write(hpos);
    delay(15);
  }

  delay(5000);

  // trigger random audio playback
  analogWrite(0, -255);
  delay(15);
  analogWrite(0, 0);
}

Use these audio files if you like... the Audio FX board will randomly play one of them when Trigger 0 goes LOW.

OGG Samples - Wizzy!

So many ways to drive Wizzy... Bluetooth, PIR sensors, laser triggers, flex-sensors, vibration switches, Infrared, and accelerometers.