Part 1

DC Motor:
Two wire (power & ground), continuous rotation motors
Using pulse width modulation (PWM) to control the speed of DC

Stepper Motor:
Use multiple electromagnets around gear to divide a full rotation into equal steps.
Requires extra controller.

Servo Motor: Generally assembled by a DC motor, a gearing set, a control circuit and a position-sensor (so position can be controller precisely).
Usually three wires (power, ground, signal)
Using pulse width modulation (PWM) to control the signals of servomotors.

Part 2

Use knob to control the speed of a stepper motor.

Core components
1* potentiometer
1* step motor
Wires & jumpwires
Arduino board

How it works
Use knob to control the speed of a stepper motor.

Problems
Can’t see the movement of stepper, though I can feel it changes.

I want to control the light in different rooms.
Use IR sensor to control the brightness of LED, and turn on/off of LED

Core components

1* IR sensor
1* remote control
2* LED
2 * 220 ohms resistors
Wires & jumpwires
Arduino board

Circuit/Schematics

How it works

Button 1 : switch on/off of blue LED
Button 2 : switch on/off of yellow LED
Button + : increase brightness (++ 50)
Button – : decrease brightness (- – 50)
Two LEDs have different on/off state, but have the same brightness.

Problems

Two LEDs can’t be adjusted separately
The remote control is inaccurate

Code

pcom/IR sensor

Goal of project/interaction

Utilize 4 small buttons to create a combination locker
Use 1 big button to submit & reset
Green and red led to show whether the passcode is right or not
Yellow led to show each correct press

The lock passcode: 4213

Core components

4 * small buttons
1 * big button
3 * LED (red, yellow, green)
5 * 10k ohms resistors
3 * 220 ohms resistors
Wires & jumpwires
Arduino board

How it works

Press the button sequentially once a time with no repeat
If it is in right sequence, yellow led will blink
Press the yellow big button to submit (and it will reset at the same time)
Green led means unlocked (right), red led means locked (wrong)

Problems/bugs

If you don’t start with 4, and then you pressed 4, then press the buttons in a right sequence, the locker can still be unlocked.

Code

https://drive.google.com/file/d/1dMNzO5L76kNQxGnp5vSFpdWs0Kjg4Gy6/view?usp=sharing

Gunnar Knechtel Photography

Most of David Bowen’s projects focus on the recurrence of natural elements. Tele-present water is gathering real-time data from a remote unknown location somewhere in Pacific Ocean and transmitting valid data (intensity and frequency of the water wave) to this installation. As described on the website “This work physically replicates a remote experience and makes observation of the activity of an isolated object, otherwise lost at sea, possible through direct communication.”

My interest has been aroused while taking a different perspective. I found it sarcastic of the form choice. He is using the mechanical grid structure to represent a natural phenomenon and deliver loneliness and helplessness to its audience. Why a obviously unnatural structure rather than a replicant of natural water waves? Why in a museum with all the unnatural surrounddings? Is it a parody to the mechanized world?