Int to Physical Computing

op-amp

2006-04-25T13:42:00.000-07:00

code_working

2006-04-14T16:36:00.000-07:00

'****************************************************************
'* Name : UNTITLED.BAS *
'* Author : [select VIEW...EDITOR OPTIONS] *
'* Notice : Copyright (c) 2006 [select VIEW...EDITOR OPTIONS] *
'* : All Rights Reserved *
'* Date : 4/14/2006 *
'* Version : 1.0 *
'* Notes : *
'* : *
'****************************************************************
DEFINE OSC 4

DEFINE ADC_BITS 8
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEuS 20

RedLed var portd.1 'to test transmitted data
bluLed var portd.0 'to test received data from pd

measurement VAR BYTE
counter VAR BYTE

outPin var portc.6 'transmitting pin

counter=0

TRISA=%11111111 'to set all portA to analogue input
ADCON1=%00000010

main:

adcin 0, measurement
serout2 outPin, 16468, [DEC measurement,13,10]

high REdLed
pause 50
Low RedLed
counter=counter+1

Pause 100

goto main

code_Analogue In & Serial Out

2006-04-14T12:28:00.000-07:00

DEFINE OSC 4

DEFINE ADC_BITS 8
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEuS 20

‘This is to test if the values were transmitted correctly
‘It will blink once it goes out to Serial Out
RedLed var portd.1
‘This is to test if the values were received correctly
‘It will blink once something comes in from the Serial In
BluLed var portd.0

‘Variable for the measurement
measurement VAR BYTE
‘Variable to count the number of transmission
counter VAR BYTE

'this will be the pin that I transmit from
outPin var portc.6

counter = 0

TRISA = %11111111 ' Set PORTA to all input
ADCON1 = %10000010 ' Set PORTA analog and right justify

main:

adcin 0, measurement 'get adc value from channel 0 put in counter

serout2 outPin, 16468, [DEC measurement ]

high RedLed
pause 50
Low RedLed
Counter = Counter + 1

Pause 100

goto main

code_test serial

2006-04-11T22:21:00.000-07:00

counter var byte
Startcounter VAR BYTE

Startcounter = 0
TRISA = %11111111 ' Set PORTA to all input
ADCON1 = %10000010 ' Set PORTA analog and right justify

main:

serout2 PORTC.6, 16468, [DEC counter ]
counter = Startcounter

goto main

w_8_group presentation

2006-03-20T00:09:00.000-08:00

refer to
this page

w_7_midi

2006-03-07T19:05:00.000-08:00

If ASCII is a protocol for text MIDI is for music. MIDI synthesizer decodes binary codes from PIC into musical notes. We can experience more defined sound by plugging it in synthesizer equipped with various sound module.
As I have worked in a place where I can witness developments of digital instruments for music, I can tell how MIDI has been improved. About 10 years ago, keyboard players had to install a separate MIDI box near their keyboards. But after synthesizer with built-in midi (i.e. Yamaha SY-99, musician's longtime favorite) came into world, keyboard players lessened their carriage weight for concerts.

The problem I encountered while wiring this circuit was from wrong configuration settings. I should have changed configuration option to HS. Joseph helped me when I almost gave up after tens of errors.

I found wiring circuit or slodering MIDI connector was basically same as for DB9 serial connector. MIDI is for exchnaging data between PIC and other device as DB9 is between PIC and PC.

I did not have 7404 Hex inverter. I made simple circuit using Michael's code example. Experiment of changing instrument type, note or volume by varying arguments is set aside for future.

w_7_midi_code from Michael

2006-03-07T19:03:00.000-08:00

'****************************************************************
'* Name : midi.BAS *
'* Author : Michael Luck Schneider *
'* Notice : Copyright (c) 2006 Michael Luck Schneider *
'* : All Rights Reserved *
'* Date : 2/28/2006 *
'* Version : 1.0 *
'* Notes : *
'* : *
'****************************************************************
define OSC 20 'midi needs a 20 mhz clock

txPin var portc.6
LED var portd.0
Sw1 var portb.7

output led
output txpin
input sw1

x var byte
lastSw1 var byte

for x = 0 to 6
high led
pause 100
low led
pause 200
next

lastsw1 = sw1

main:
if sw1 != lastsw1 then 'if there has been a change of state
pause 10 'debounce
if sw1 = 1 then 'see if the button has been pushed
serout2 txpin, 12, [144, 80, 127] 'noteon channel 1, note 80, full volume
else 'or released
serout2 txpin, 12, [144, 80, 0] 'noeton channel 1, note 80, 0 velocity (same as note off)
endif
lastsw1 = sw1 'for change of state
endif

goto main

w_6_servo motor

2006-03-07T18:09:00.000-08:00

Please click the image to start.

I tried this LAb without H-bridge. To my understanding, H-bridge is necessary to change the direction of servor mortor. I borrowed code from Todd and the motor changed it's direction without H-bridge. I vaguely understood that "if" statement in code programming has made it possible. I will give it a try again with H-bridge.

w_6_servo motor_code from Todd

2006-03-06T20:28:00.000-08:00

''****************************************************************
'* Name : UNTITLED.BAS *
'* Author : Todd Holoubek *
'* Notice : Copyright (c) 2004 Todd Holoubel *
'* : All Rights Reserved *
'* Date : 6/7/2004 *
'* Version : 1.0 *
'* Notes : *
'* : *
'****************************************************************
DEFINE OSC 4
start:
pulseWidth var byte
'thes values can be vary with different motors
minPulse CON 75
maxPulse CON 250
refreshPeriod CON 5
'pulsewidth = maxPulse
myDir var byte
myDir = 1
main:
low PORTD.2
PulsOut PORTD.2, pulseWidth
pause refreshPeriod
if myDir = 1 then
pulsewidth = pulseWidth + 1
else
pulsewidth = pulseWidth - 1
endif
IF pulseWidth <= minPulse THEN
myDir = 1
ENDIF
IF pulseWidth >= maxPulse THEN
myDir = 0
ENDIF
GOTO main

w_5_serial out_ascii text

2006-03-05T20:14:00.000-08:00

Please click the image to start.

I learned that English characters need to be changed into binary numbers to be exchanged between digital device. ASCII is a protocol, or an agreement, which is setup for this. Call and response worked well. But I failed in making it work with photocell and potentiometer.

w_5_serial out_ascii text_code from Michael

2006-03-05T20:05:00.000-08:00

DEFINE OSC 4
myvar var byte

main:

serout2 portc.6, 16468, ["myvar = ", myvar, 13, 10, "mydec = ", dec myvar, 13, 10]
myvar = myvar + 1
pause 200
goto main

w_4_simple pwm_blinking LED

2006-03-05T19:19:00.000-08:00

Blinking LED

Please click the image to start.

PWM (Pulse Width Modulation) was understandable conceptually. To implement in the code was another matter.

w_4_simple PWM_code from Michael

2006-03-05T18:54:00.002-08:00

'****************************************************************
'* Name : UNTITLED.BAS *
'* Author : [select VIEW...EDITOR OPTIONS] *
'* Notice : Copyright (c) 2005 [select VIEW...EDITOR OPTIONS] *
'* : All Rights Reserved *
'* Date : 9/29/2005 *
'* Version : 1.0 *
'* Notes : *
'* : *
'****************************************************************
DEFINE OSC 4

output portc.0

arf var byte
duty var byte
counter var byte

for arf = 0 to 3
high portc.0
pause 100
low portc.0
pause 200
next

main:

for duty = 0 to 255
pwm portc.0, duty, 1
next

goto main

w_6_Reading

2006-03-01T00:07:00.000-08:00

Response to "Testing Beyond Usability" by Elizabeth B.N. Sanders

Elizabeth B.N. Sanders’ “Testing Beyond Usability” shows a whole process of designing a new product – school lunch kits. Reading her essay I was amazed too many researches are executed for design requirements. A research, especially on users’ feedback has been on the top of marketing department’s task list. Emphasis on design research, to my knowledge, is quite a new trend. However, this essay proves that design researches affect no less than marketing researches.
I think finding out users’ insight into a product will be more precisely and efficiently acquired by design research. Yet my experience tells that in too many cases designers are not asked to attend meetings for deciding whether to make a new product or not. Sanders’ essay also implies that Fitch RS, design company, was asked to embark on research only after Thermos had decided to make new lunch kits.
I think early involvement of designing team is critical for securing success of new products. This practice will save many tasks that followed initial engagement of designing team.

w_4 Analog output

2006-02-28T21:19:00.000-08:00

Please click the image to start.

I have to figure out what I did.

w_3 variables & analog input_code from Michael

2006-02-28T20:57:00.000-08:00

'****************************************************************
'* Name : UNTITLED.BAS *
'* Author : Mike Reger *
'* Notice : Copyright (c) 2006 Mikro In Control *
'* : All Rights Reserved *
'* Date : 2/28/2006 *
'* Version : 1.0 *
'* Notes : *
'* : *
'****************************************************************
DEFINE OSC 4

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

w_3_Analog Input

2006-02-21T23:14:00.000-08:00

Through labs of digital input and analog input, I learned how to wire circuit with microcontroller.
After reading an explanation of microcontroller chip, I figured out how it works.
For this lab of analog input, I succeeded in transmitting data through DB9 serial connector.
By adjusting potentiometer, I varied current flow, and accordingly data values transmitted to a computer.
Yet I could not make my own code. I will keep trying to code my own.

w_2_success after burning_2

2006-02-21T22:05:00.000-08:00

I figured out why my microcontroller was burned at the first attempt. Comparing pictures of success and ones of being burned shows the reason. The failed one is circuited wrong. One end should be connected to power and the other to the ground. But the failed one did not give the circuit way out. That is what made the circuit banged.
On the successful circuit, I had current flowing indefinitely, finally 2 LEDs blinking.

The other issue I have been sticking around was how to supply a microcontroller with power. I thought "input" in a pic programming and 5-volt power supply in the diagram was identical. So I kept trying to power the microcontroller with only one input - that is onto the middle of microcontroller. I was wrong.

After a few weeks of lazy and foolish attempts, I finally made it. I owe many thnaks to Kazu.

You must have unequal voltage to have electricity happily tour around a circuit. I was among few who didn't realize it.

w_2_success after burning

2006-02-21T22:01:00.000-08:00

w_2_Lab_code from Michael's Phycom syllabus

2006-02-21T20:19:00.000-08:00

'****************************************************************
'* Name : UNTITLED.BAS *
'* Author : [select VIEW...EDITOR OPTIONS] *
'* Notice : Copyright (c) 2006 [select VIEW...EDITOR OPTIONS] *
'* : All Rights Reserved *
'* Date : 2/21/2006 *
'* Version : 1.0 *
'* Notes : *
'* : *
'****************************************************************
DEFINE OSC 4 'Define the clock speed

'set the jobs of the different pins
output portd.1
output portd.0
input portd.2

broc:

if portd.2 = 1 then 'if the switch is pushed
low portd.1 'turn on one LED
high portd.0 'and off the other
else 'if the switch is not pushed
high portd.1
low portd.0
endif

goto broc 'go back to the beginning and do it again

reading_Emotion & design by Don Norman

2006-02-08T05:45:00.000-08:00

Response to “Emotion & Design: Attractive things work better” by Don Norman

Norman rightly explains that how good designs affect our ‘affect’. Adding a few to his examples, food tastes better served in fancy plates on candle light dining table. When put on clothes that I have coveted long, I feel more confident.
He also mentioned “good human-centered design” enhances cognitive concentrations helping avoid distractions. To extend his understanding, safety tools such as goggles, gloves and helmets are not alone protecting us from hazards. The design stimulating ‘negative affect’ will increase our safety alertness.
So when you work on power tools in Phycom shop, try to be as on ‘negative affect’ as possible to keep you unharmed.

free samples

2006-02-07T14:07:00.000-08:00

free samples

Burn_2

2006-01-31T21:14:00.001-08:00

Burned hole on a microcontroller

Burn_3

2006-01-31T21:14:00.000-08:00

Burned microcontroller_1

2006-01-31T21:13:00.000-08:00

Observation Project_Yatagan_3

2006-01-31T19:00:00.000-08:00

Price display for customers

Observation Project_Yatagan_2

2006-01-31T18:59:00.000-08:00

Old cash register

Observation Project_Yatagan_1

2006-01-31T18:57:00.000-08:00

Look outside the restaurant.

w_1:(continued)

2006-01-24T20:47:00.000-08:00

Each LED is linked to power differently.

The Yellow one: through a variable resistor

The Green one: through a swich.

The Red one: I took a risk of connecting it to a 5V regulator while skipping 220 ohm resistor. It was just for a few minutes.
I wonder what will happen it it is kept for long. Does anybody know the answer? I'm resisting a lure to try it.

w_1:(continued)

2006-01-24T20:39:00.000-08:00

This is really valuable information.

When I tried to connect a variable resistor I was almost lost. It has 3 legs.
I could not figure out which is for power which is for data and which is for ground?

After several trial and error, I got a help from Todd.

The secret is
... power, data, ground from the left. You can swich power with ground. But the LED's response will swich too.

Already knew it?

w_1:(continued)

2006-01-24T20:34:00.000-08:00

I tried with 3 LEDs, but failed with the third.

Up to the second, it was o.k. I linked the power to the second with additional wire while having the third linked.

How can I test LED's perfectness? Can I check it with a testor?
Thanks in advance.

W_1:You can learn something from my mistakes

2006-01-24T20:20:00.000-08:00

1.LED's anode and cathode:

I only found after more than 10 failures that I inserted LED with wrong direction.
A(anode) and K(cathode) !!!. Longer leg is A and shorter one is,,,

2. Right use of resistor:
I thought that I can use any resistor from the kit, but each pack is different. Be careful. Yet there is no clear sign on it. Is there?

3. Check current flow with a tester more often than you think enough
You can find out on which point current is not flowing with a testor. Try it. It's fun.

Course Blog

2006-01-23T09:13:00.000-08:00

Int. to Physical Computing

Course Syllabus

2006-01-23T09:11:00.000-08:00

Introduction to Physical Computing
H79.2301.2 Michael Schneider Wed 09:30am to 12:00pm
This course expands the students' palette for physical interaction design with computational media. We look away from the limitations of the mouse, keyboard and monitor interface of today's computers, and start instead at the untapped expressive capabilities of the human body. We consider uses of the computer for more than just information retrieval and processing, and at locations other than the home or the office. The platform for the class is a microcontroller, a single-chip computer the size of a postage stamp, programmed using BASIC. The core technical concepts are digital, analog and serial input and output. Students have weekly lab exercises to build skills with the microcontroller and related tools, and longer assignments in which they apply the principles from weekly labs in a creative application. ( Production Technique, Foundation, Teamwork, Programming ) Syllabus