Homework: Plush toy

Hello! This my final plush toy – Smile.


When turning on the switch, it looks in this way:


How I make this plush toy

  • Finish the sketch of the toy and the circuit
  • Choose the fabrics
  • (1) The fabric for the hair and eyes: black and very thick fabric to block the light
  • (2) The fabric for the face: flesh and thin fabric to let the light get through it
  • (3) The fabric for the mouth: Two different red fabrics
  • Cut the outline of the hair, face, eyes, and mouth
  • Add a thickness to both the hair and the face
  • Sew all the parts together! Hair-face-details
  • Finish the circuit
  • (1) Buy the electric materials: two red LEDs, one AA2 battery case
  • (2) Choose the resistors
  • Two 100 ohm – the light can get through the fabric and are not too dazzling
  • (3) Solder them together!
  • Place the circuit inside the face of the plush toy and adjust the position of the LEDs
  • Fill the face with cotton and close the face part
  • Finish!



The most difficult part I met is to sew the hair together. The black fabric is too thick so I cannot use the sewing machine. At first, I sew the thickness part to the front piece and then to the back piece. When sewing it to the back together, I use two steps: at first start in the middle of it and sew one half side, and then the other side. And it becomes more and more difficult when getting close the side.


Circuit diagram



The circuit has two LEDs, two 100 ohm resistors and a battery case with a switch. I use paralleling to connect the two LEDs so they won’t be affected by each other.


The name and the story

His name is Smile. This is a simple name and he has a simple hope to bring happiness to others.

Smile comes from a comic book and travel to the world where we live. During his travel, he found that smile is contagious, which means when he smiles to other people, they often smile back even they don’t know each other really. It always makes him feel happy, and he hopes others to feel happy too.

Week 3 Homework

Hello! Here is my homework for week 3.

Digital Input

The Serial Monitor

Two buttons control one LED

It is very interesting to write code. And here is my final code.

const int buttonPin1 = 2;
const int buttonPin2 = 3;
const int ledPin =  13;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);

void loop() {

  if ((digitalRead(buttonPin1) == HIGH) && (digitalRead(buttonPin2) == LOW)) {
    digitalWrite(ledPin, HIGH);

  if ((digitalRead(buttonPin1) == LOW) && (digitalRead(buttonPin2) == HIGH)) {
    digitalWrite(ledPin, LOW);

Thank you!

Rice Cooker Teardown


I bought a rice cooker from the thrift store. And this is a brief introduction:


A Glass Lid (Lost)
B Inner Pot
C Heating Body
D Panel
E Cook Switch

This rice cooker is very easy to use. Just connect the plug into a outlet and switch the rice cooker ON. It will start cooking and the cook light will illuminate. After cooking, the rice cooker will keep warm automatically and the keep warm light will illuminate.

Teardown steps


Step 1 Remove the Bottom Plate
1.1 Remove the spanning screw
1.2 Remove the rubber cushions
1.3 Unscrew the legs
1.4 Remove the bottom plate


Step 2 Remove the Hotplate
2.1 Unscrew the screw of wire groups
2.2 Bend & unlock the spring latch
2.3 Unscrew the surrounding screws
2.4 Remove the hotplate


Step 3 Tear down the inner parts
2.1 Push the plates together to unlock the hotplate.
2.2 Find the spring inside the hotplate
2.3 Find & unlock the heating piece
2.4 Cut the wire groups
2.5 Drag out the panel
2.6 Unscrew the panel


Reassembly & Conclusion
What makes me really surprised is its working style. The rice cooker uses its wonderful structure to achieve the cooking and keeping warm function. The most interesting thing is the spring inside the hotplate. I reassemble some parts of the rice cooker and realize the fact that, the spring is compressed in the cooking mode to let the inner pot keep close to the heating body, while it extends in the keep warm so that the inner pot can keep away from the heating body. And it is really excited to find out how it works with the cook switch on the panel. I realize that some ingenious designs are very simple but really useful!

Hello this is Sherry : )


Hello, my name is Xiaorui Wu and you can call me Sherry. I come from China and I studied Industrial Design before. It is my first time to be in NYC and I feel everything is new to me. I never studied Arduino before and I feel very excited to learn how to code. I want to explore more in design field and I also want to experience and learn more about the culture here. Thank you : )