crtl-i » Process

Sub-Dividing

crtl-i — Thu, 25 Mar 2010 09:51:02 +0000

Photocell + 8×8 LED Matrix

crtl-i — Thu, 04 Mar 2010 14:43:07 +0000

This is an example of using 2 photocells and a variable resistor as analog inputs to control 8×8 LED Matrix with PIC18F452, UDN2981, and ULN2803. The input values of the two photocells are compared. When the values are the same, LED lights up randomly within the entire board. Depending on how much darker a photocell is compared to the other, LED lights up within the range that is more focused towards a corner. The variable resistor controls how fast the LEDs blink. This is how the board was set up:

The following is the code:

DEFINE LOADER_USED 1

DEFINE OSC 20

INCLUDE “modedefs.bas”

DEFINE ADC_BITS 10

DEFINE ADC_CLOCK 3

DEFINE ADC_SAMPLEUS 20

ADCON1 = %10000010

trisb =%00000000

trisd =%00000000

trisa =%11111111

trisc =%10000000

an0 var word

an1 var word

an2 var word

an0b var byte

an1b var byte

an2b var byte

portb = 0

portd = 0

rand_max var byte

rand_min var byte

random_word var word

randomdig var byte

main:

GOSUB getadc

IF an1b < an2b THEN

rand_max=an1b

rand_min=0

ENDIF

IF an1b > an2b THEN

rand_max=7

rand_min=7-an2b

ENDIF

IF an2b = an1b THEN

rand_max=7

rand_min=0

ENDIF

GOSUB generate_Random

portb = 1<

GOSUB generate_Random

portd = 1<

PAUSE 10*an0b

gosub bd_off

PAUSE 1*an0b

GOTO main

bd_off:

portb=0 : portd=0

RETURN

getadc:

ADCIN 0,an0

ADCIN 1,an1

ADCIN 2,an2

an0b = (an0*8)>>10

an1b = (an1*8)>>10

an2b = (an2*8)>>10

RETURN

generate_random:

RANDOM random_word

randomdig = random_word DIG 1

IF randomdig > rand_max THEN GOTO generate_random

IF randomdig < rand_min THEN GOTO generate_random

RETURN

Analog / Digital Input, Output

crtl-i — Mon, 22 Feb 2010 06:14:42 +0000

This is an example of using 2 variable resistors as analog inputs and a switch as a digital input to control 8 LEDs with a PIC18F452 chip. Variable resistor 1 is used to control which LEDs light up. The second variable resistor controls how fast the LEDs blink. The switch decides whether the LEDs blink or not. MAX232CPE is used to allow serial communication with a computer. PICBASIC was used to program the chip. This is how the board was set up:

The following is the code:

DEFINE LOADER_USED 1
DEFINE OSC 20
INCLUDE “modedefs.bas”

DEFINE ADC_BITS 10
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEUS 20

ADCON1 = %10000010

TRISA = %11111111
TRISB = %00000000
TRISC = %10001000

adc VAR WORD
adcbyte VAR BYTE

SPEED VAR WORD
SPEEDbyte VAR BYTE

SWITCH VAR PORTC.4

main:

IF SWITCH = 1 THEN

ADCIN 0, adc
adcbyte = adc/140

ADCIN 1, SPEED
SPEEDbyte = SPEED/140

PORTB = %00000001 << adcbyte
PAUSE 100*SPEEDbyte
PORTB = 0
PAUSE 100*SPEEDbyte

ELSE
ADCIN 0, adc
adcbyte = adc/140

PORTB = %00000001 << adcbyte

ENDIF

GOTO main

Gradient Patterns

crtl-i — Mon, 08 Feb 2010 06:15:31 +0000

Testing different patterns with grasshopper.

8×8 LED Matrix

crtl-i — Fri, 29 Jan 2010 07:38:10 +0000

Front side

Cathode rows soldered

Anode rows soldered

Physical Computing – Current Amplification

crtl-i — Sat, 23 Jan 2010 15:00:24 +0000

Today was my first day at a physical computing workshop run by Jin-Yo Mok (http://www.geneo.net). I’m starting from the very basics to understand how every single piece operates at the most fundamental level. The breadboard in the image shows the simplest setup of current amplification using an NPN transistor (2N2222). Hopefully, I’ll be able to design custom circuit boards in the future as I become more comfortable with all these volts and currents :)

Fibers 2

crtl-i — Mon, 04 Jan 2010 16:04:24 +0000

Ordered, but random
Random, but ordered

Pixel-scape

crtl-i — Sun, 30 Aug 2009 17:15:11 +0000

I have been exploring this idea of a pixelated landscape. Possibly, a park composed with a few types of regular components like grass, walkways, bench, water, light, etc. A controllable intensity of randomness is introduced. This is an attempt to create a simple green surface with a walkway defined by a curve. The curve attracts/selelcts the points according to its defined weight.

Facade Studies

crtl-i — Mon, 06 Jul 2009 19:23:03 +0000

Some facade studies. All these patterns are made through a version of script that is very close to the 3D-pixelate code.

Random / Order – Growth

crtl-i — Mon, 05 Jan 2009 12:22:37 +0000

I recently purchased a book which turned out to be one of the most amazing books I have ever come across: “A New Kind of Science” by Stephen Wolfram. The entire book is available online for viewing at: http://www.wolframscience.com/nksonline/toc.html

I have been reading a chapter on randomness, which is why I have been writing scripts that heavily depends on random number generator. These are the results of a growth algorithm that explores a territory that is somewhere in between being random and ordered.