Observation of Public Interactive Technology.

What captured my attention was the elevator system at 2 Metrotech building.
When I first arrived in the lobby with 8 elevators, I was a bit lost because I didn’t see any ordinary up/down elevator button. 
Instead, there was one screen (size of a tablet), with a keypad. I assumed it was for operating the elevator because there was nothing else. 

I typed in the number of floor I was heading to. However, the confusion went on because I didn’t get any response from the screen that my response went through the system. So I accidently typed in bunch of other numbers being skeptical about this technology.
It was funny to observe people who arrived several minute after me also getting confused. 

After some time, the elevator finally arrived. And there I saw another screen next to the door indicating the floors this elevator will be stopping by. And as you expected, there was no button inside the elevator as well.Then I finally understood this system!

After using it for the first time, it feels like it’s an efficient and energy-saving system, especially when there are a lot of people using it and there are many floors on the building. However, I think it was not so much intuitive, at least for the first time users.

Crawford defines an interactivity as a conversation in his book ‘The Art of Interactive Design’. To reflect it upon this case, I felt like I was the one only talking when interactig with the elevator system. it wasn’t a cyclic process, where I had to get a response back from it. It could have been ideal if there were small section on the screen that shows which information is processed by the system. Although I do think “typing the number” is the core performance for this system, and it works fine as is, it was not friendly at all. 

Arduino - analog input and digital output _pt1

This week, I spent much more time reading about microcontrollers than actually making a circuit. It was tough!
This is a circuit with potentiometer and a led light. I used Arduino as power and ground.

Then to put analog input to Arduino, I was trying to use photocell, which detects light and changes voltage accordingly.

Analog input(A1) wire should be installed on the same line where the ground wire of photocell is installed, because that’s where the voltage change happens.

Then, to use the input data to change the brightness of led, I connected it to digital(D10, PWM)

below is the code for this to operate (which didn’t work):

const int led = 10;
int cellState = 0;
int brightness = 0;

void setup() {


void loop() {
//read the photocell
cellState = analogRead(A1);
brightness = cellState/4;


© ymchoi 2019