This is a DIY electrical Robot kit I made for 8-14 students. They can DIY it for their youngest brother as a gift, put above of the candy bowl or other "treasure box" as a guarding monster. When something approached, it will open the eye. This DIY kit can be assembled in 3-4 hours for any one.

I develop it for primary and middle school students when I was a part-time teacher of “maker class” in The High School Affiliated to Renmin University of China. The director wants me to make a kit which is attracting and technical for students. Inspired by Mike Wazowski ( a green cyclopia from Disney Pixar's movie “Monsters Inc”) and monsters who guard the treasures. Materials are milk cartons which was throw away by students every morning in this school. I wish the kits could inspire the student be creativity and pay attention to the view things.

Step 1: Out Look

Step 2: Material List

Here is some materials and tools you may be need.

Tools:

Pliers
Screwdriver
scissor
502 super glue
painting tools

Materials:

Micro servo SG90 (9g) - TowerPro
Ultrasonic sensor hc-sr04
Microduino Core & USBTTL (Since it's small)
USB cable for Arduino to computer
Wires
Nuts & Screws ( 1.5m*6 Taobao: https://goo.gl/WpKAkl )
Tapping Screws ( 3m* 8 )
L shape plastic supports (https://goo.gl/z5w04O)
Other plastic supports (https://goo.gl/jZ6v7V)
Ping-pong balls
Cachapon ball (or lotteries ball)
PVC plastic strip (the wite one)
Milk boxs

Software:

Arduino IDE:
https://www.arduino.cc/en/Main/Software
Schematics are done in Fritzing:
http://fritzing.org/download/

Step 3: Part1: Structure

The internal structure is shown in the first pic. I use 2 motors to control xy directions, X: eyes left & right Y: eyelid up & down. I use PVC plastic strip as an transmission structure.
Screwed the L shape & other plastic supports tighten together like this.
Note: The foremost 2 tapping Screws are for locking up the eyelid, above on the left & right yellow strips

Step 4: Part1.1: Electronic Structure

Make 2 motors glued together like the first pic. Crossed shape, One is facing up (X-axis) another facing behind (Y-axis)
Cut the raised parts of the 2 motors, convenient for later glue with the base.
Mount the blades (2 white plastics)

Step 5: Part1.2: Transmission Structure

Shape the PVC strip like this ( Length: 45~50mm, Width: 7mm)
Drill 2 holes (diameter 1.5) at both ends.
Screwed the PVC strip and motor like that
Holding the hemispherical lettory ball with the

Step 6: Part2: Schematic

Ultrasonic sensor hc-sr04

Trig - D4
Echo - D2
Vcc - 5V
Gnd - Gnd

Servo motor

Red - 5V
Brown - Gnd
X axis - D8
Y axis - D10

Step 7: Part 3: Code

Board selection: Tool—Board—Arduino Uno (or Microduino both available)

Big_Eye2.ino
Download

Step 8: Step 4: Draw

Put the electronic part in your milk box and painting as whatever monster you like. Done!!!
After some friends help me improve it, my "monster" can be mounted to the wall, 2 month later.

In the end, we arranged a Workshop in 2014

Introduction: A DIY Cyclopia Robot - Candy Monster