Observation – Pick a piece of interactive technology in public, used by multiple people. Write down your assumptions as to how it’s used, and describe the context in which it’s being used. Watch people use it, preferably without them knowing they’re being observed. Take notes on how they use it, what they do differently, what appear to be the difficulties, what appear to be the easiest parts. Record what takes the longest, what takes the least amount of time, and how long the whole transaction takes. Consider how the readings from Norman and Crawford reflect on what you see.

The elevators in Tisch.
I observed two elevators that settled in Tisch building, and they are also the daily commute technology for getting students to different floors. 
My assumptions: 1. it will be used by people who want to go up or down stairs, and the floor they want to go might higher than 2 floor. Another context might be either the elevator won't take too long to wait or the people who want to use it are not in a hurry.

Differently: 1. wait for few seconds and then go for the stairs

Difficulties: 1. might be push buttons are not that easy to touch, some people will look twice or more time to push it and look if the light are up or not.
2. everyone will double check the button 
3. waiting without knowing which floor the elevator is on 

1. just hear the "ding" sound to be noticed that the elevator is here
2. see the door to recognize whether it is arrived or not.
3. when they at the first floor, they will just see the numbers on the top of the elevator to decide whether use it or not (the waiting time).

I record the time of different people using the elevators:
I would say the time consuming will be the part that when people are waiting in front of the elevators, and it is also the longest part of the transaction.

1 x photoresistor
2 x LED
2 x 22k ohm resistors
1 x 4.7k ohm resistors
1 x Arduino UNO
1 x breadboard
jumper wires

I tested out the photosensor with Arduino, this experience really confused me at the very beginning.
I connected the circuit and make it no problem to light the LED lighting up, but the sensor seems did not affect the LED.... 
After reconnecting the circuit, it's still won't work. So I just tried to read the analog of the photosensor.
Then I found out the analog reading is too small, so it will be always lower than the point that I set before:  
if (sensor_value > 200)     // the point at which the state of LEDs change 
      digitalWrite(led, HIGH);  
There are two ways that I can make it work: 1. change the resistor which connected to the photosensor  2. change the point that I set in the Arduino application.
Then it works.
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