October 20, 2005

PComp Assignment 6

Bought my motor have not completed this lab because I haven't been able to find a H-Bridge.

Posted by sj695 at 11:22 PM

October 13, 2005

PComp Assignment 5

This week we are sending and recieving data to Processing via the serial port. In this lab i moved a circle around the screen with a potentiometer. Here's the code:

-- Processing CODE --

/* Serial call-and-response
by Tom Igoe (with adjustments by Dano)

Sends a byte out the serial port, and reads 3 bytes in.
Sets foreground color, xpos, and ypos of a circle onstage
using the values returned from the serial port

Updated October 12, 2004
*/

import processing.serial.*;

Serial myPort; // The serial port

int redNess = 255; // fill color
int[] serialStuff= new int[3];; //where we keep all the incoming stuff
int serialCount = 0; // a count of how many bytes we receive
int xpos= width/2;; // Starting position of the ball
int shape =65;

void setup() {
size(255, 255); // stage size
noStroke(); // no border on the next thing drawn
myPort = new Serial(this, Serial.list()[0], 9600);
serialWrite(65); // send a capital A to start the MC sending
}

void draw() {
background(0);
fill(redNess,0,0);
// Draw the shape
if (shape==65){ //switch value is 65 or 66 (I added 65 to the normal values 0 and 1)
ellipse(xpos, 100, 50, 50);
}else{
rect(xpos,100,50,50);
}
}

void serialEvent() { //this function gets called when something happens involving the serial port

//serial is a special variable provided by processing to give you the oldest byte waiting to be read
// add the latest byte from the serial port into the correct slot in your byte array
serialStuff[serialCount] = myPort.read();
serialCount++;

// if we have 3 bytes, parse the string:
if (serialCount> 2 ) {
redNess = 2* serialStuff[0];
xpos = serialStuff[1];
shape = serialStuff[2];

// after you got them all, go back to putting the bytes in the first slot in the array again
serialCount = 0;
// get a number between 0 to 255 for the mouseX
//if your stage is bigger than 255 //int mouseXIn0to255 = 255*mouseX/width
//send out the mouseX to postion the servo motor
myPort.write(mouseX);
}
}

-- PIC BASIC CODE --

DEFINE OSC 4

DEFINE ADC_BITS 8
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEuS 20

lightVar var byte
potVaR VAR BYTE
switchVar var byte
inByte var byte

input portb.7

main:
switchVar = portb.7 + 65 //make it readable
adcin 0, potvar
adcin 2, lightvar
serout2 portc.6, 16468, [lightVar,potVar,switchVar]
serin2 portc.7, 16468, [inbyte]
Pulsout portd.0, inByte
PAUSE 10

goto main

Posted by sj695 at 11:17 PM

October 06, 2005

PComp Assignment 4

It's amazing how much we're learning in PComp. We're in week 4 and programing a computer chip to control a servo. So this week we're programming a pic chip to control a servo with a potentiometer. Each week I feel like a painter learning how to create more colors. Here's the code:

DEFINE OSC 4
start:

INCLUDE "modedefs.bas"

' Define ADCIN parameters

' Set number of bits in result
DEFINE ADC_BITS 10

' Set clock source (3=rc)
DEFINE ADC_CLOCK 3

' Set sampling time in microseconds
DEFINE ADC_SAMPLEUS 10

' Set PORTA to all input
TRISA = %11111111

' Set up ADCON1 analog and right justify the result
adcon1 = %10000010

'define adc vars
adcVar0 VAR WORD 'Create variable to store result

'set a var for the pulsewidth- this tells the motor where to go
pulseWidth var byte

'thes values can be vary with different motors
minPulse CON 75
maxPulse CON 250
refreshPeriod CON 20

main:

'read adc data
ADCIN 0, adcVar0

'message the numbers so the value from the potentiometer matches the max and min of the servo
adcVar0 = (adcVar0/4) + 75

if adcVar0 >= 250 then
adcVar0 = 250
else
adcVar0= adcVar0
endif

'assign pulseWidth to the position of the potentiometer
pulseWidth = adcVar0

'set the pin low
low PORTC.3

'pulse the pin
PulsOut PORTC.3, pulseWidth

'pause
pause refreshPeriod
GOTO main

Posted by sj695 at 10:55 PM

September 29, 2005

PComp Assignment 3

For this week's assignment we are to communicate with a computer with our pic chip via the serial port. In the last week's lab I used a potentiometer instead of a switch to turn on the led, so this weeks lab was quite simple requiring nothing more than code midification. I must say it was quite amazing to see those numbers run down the screen in hyperterminal.

Here is the code I used:

' PicBasic Pro program to display result of
' 10-bit A/D conversion through serial at 9600 baud
'
' Connect analog input to channel-0 (RA0)

' Define ADCIN parameters
DEFINE ADC_BITS 10 ' Set number of bits in result
DEFINE ADC_CLOCK 3 ' Set clock source (3=rc)
DEFINE ADC_SAMPLEUS 50 ' Set sampling time in uS

ADCvar VAR WORD ' Create variable to store result

TRISA = %11111111 ' Set PORTA to all input
ADCON1 = %10000010 ' Set PORTA analog and right justify result
Pause 500 ' Wait .5 second

main:
ADCIN 0, ADCvar ' Read channel 0 to adval
serout2 PORTC.6, 16468, [DEC ADCvar, 13, 10] ' print it to serial out,
' with linefeed and carriage return (10, 13)
GoTo main ' Do it forever

Posted by sj695 at 10:38 PM

September 28, 2005

OBSERVATIONS PROJECT

Have sensors built into the doors that will measure sound.

Posted by sj695 at 06:56 PM

OBSERVATIONS PROJECT

Gives people personal space.

Posted by sj695 at 06:55 PM

OBSERVATIONS PROJECT

Used for shared/couple sitting

Posted by sj695 at 06:54 PM

September 22, 2005

PComp Assignment 2

For our second Physical Computing lab assignment we had to program a pic chip using a version of Basic.

Day 1
Last night I was able to get a LED to blink by writing the following code:

'Define the clock speed
DEFINE OSC 4

'These are the ports i'm working with
OUTPUT portb.1 '34 Pin Number
OUTPUT portb.4 '37 Pin Number
OUTPUT portb.7 '40 Pin Number

'Start Main Function
main:

    ' Turn on Port 1
    HIGH portb.1

    ' Leave on for half a second
    PAUSE 500

    'Turn off Port 1
    LOW portb.1

    'Turn off for half a second
    PAUSE 500

    ' Go back and repeat
goto main

Seems simple, but the most difficult portion of the Lab was setting up the bread board. After receiving help from other students in the lab I had the board setup in 2 hours of course I also had to solder and wire my switch (I didn't use a switch in assignment 1). The programming took about 15 minutes.

Day 2
Today I disassembled my board to make sure i knew what was going on and to aslo add and program my switch. Reassembling my board was really helpful and I feel like I have a much clearer idea of what's going on. Here is the code I used to turn the LED on and off with the switch:

input portb.0
output portd.1

main:
    if portb.0 = 1 then ' if the switch is closed on pin RB0
        low portd.1 ' set pin RD1 low
    else
        high portd.1 ' set RD1 high
    endif
goto main

I also added a potentiometer to fad the LED when the switch was on, I was going to attempt to start next weeks lab but decided to wait.

Posted by sj695 at 05:19 PM | Comments (0)

September 12, 2005

First PCOMP Entry

This is my first Physical Computing Entry, not much here now check back later.

Posted by sj695 at 07:10 PM