My Son's science experiment help request.

[aurbo99]

Hi

My Son is trying to create an experiment using the POV to determine whether or not the human mind can make order of seemingly random patterns.

While the answer is known.. Yes. the POV prooves it. He has a different approach which is can the human mind make the same connection for the patterns (words) if they are in a different language.

Meaning, if you cannot speak,read,understand.. say French, and the POV is programmed with a French word, will your mind sort it out. not bad for a 12 year old..

I am not a linguist, so here I am.. Can I get a few of you to respond with respectable words in other languages and its english conversion so he can pick a few to use with his experiment.

On slightly different topic, is there enough room to hold 2 words in the code, and by using a jumper connected to a pair of the PD0-PD6 pins have it display word 1 or word 2?

Any assistance would be appreciated.
Steve

[magician13134]

As far as choosing words, I would choose words in English first then go here to translate them.
And for storing two pictures (words), that sure, but it would require just a little work. Since you can store several hundred lines, and a word my require only 50 or so, this should be no problem. I don't have the files in front on me at the moment, but there is a file called "sensor.c" if I remember correctly. I would use this code as your base, and just solder in a jumper to the sensor pins.

[aurbo99]

Thanks =)

[mtbf0]

since a word in a foreign language is essentially a string of random characters to one who cannot read it, strings of random characters should suffice for your experiment.

[mtbf0]

... or how about a pov eye chart?

[aurbo99]

since a word in a foreign language is essentially a string of random characters to one who cannot read it, strings of random characters should suffice for your experiment.

True, but there's the part where a person that understands that particular language will correctly identify the word where someone who does not understand that language may only give you letters.

example:
English = salute <-- English will respond with "to salute" like a soldier
French = salute <-- French (French Canadian) will respond with "Hi" a slang term for Hello <will the mind process the 'e' at the end?>
What would a bilingual Eng/Fre interpret the word as? one, the other, or both?

Arabic = تحية <-- Arabic will respond with ? <I dont have the answer myself, I dont understand Arabic! would I even recognize this as a word?>

[aurbo99]

Regarding the resistors in the circuit diagram.

R21 states a 200ohm Is it a critical value? (I dont have one) would a 180 or a 220 work in its place?

[magician13134]

Most resistors have + 10% accuracy, so your 200 Ohm could have a fairly reasonable chance of being less than a resistor marked 180 Ohm or higher than one marked 220 Ohm. It shouldn't matter

[aurbo99]

Thanks for the info,

[aurbo99]

Running to MiniPOV.exe file it generates the file.

When I load it it seems to only display one or two letters of the word.

Any clues?

LPT version POV2
Home etched

only thing not stock is the 220Ohm instead of the 200Ohm

Code: Select all

#include <avr/io.h>      // this contains all the IO port definitions
#include <avr/interrupt.h>
#include <avr/signal.h>
#include <avr/pgmspace.h>
#include <util/delay.h>

void delay_ms( uint16_t milliseconds)
{
   for( ; milliseconds > 0; milliseconds--)
   {
      _delay_ms( 1);
   }
}

#define TIMER1_PRESCALE_1 1
#define TIMER1_PRESCALE_8 2
#define TIMER1_PRESCALE_64 3
#define TIMER1_PRESCALE_256 4
#define TIMER1_PRESCALE_1024 5


// We use these macros because binary constants arent always supported. ugh.
#define HEX__(n) 0x##n##UL
#define B8__(x) ((x&0x0000000FLU)?1:0)  \
               +((x&0x000000F0LU)?2:0)  \
               +((x&0x00000F00LU)?4:0)  \
               +((x&0x0000F000LU)?8:0)  \
               +((x&0x000F0000LU)?16:0) \
               +((x&0x00F00000LU)?32:0) \
               +((x&0x0F000000LU)?64:0) \
               +((x&0xF0000000LU)?128:0)
#define B8(d) ((unsigned char)B8__(HEX__(d)))


// store all the image data in program memory (ROM)
// instead of RAM (the default)
const uint8_t large_image[] PROGMEM = {
B8(00000000),
B8(01111100),
B8(10000010),
B8(10000010),
B8(10100010),
B8(01100110),
B8(00100000),
B8(00000000),
B8(01110000),
B8(10001000),
B8(10001000),
B8(10001000),
B8(01110000),
B8(00000000),
B8(00000000),
B8(01110000),
B8(10001000),
B8(10001000),
B8(10001000),
B8(01110000),
B8(00000000),
B8(00000000),
B8(01110000),
B8(10001000),
B8(10001000),
B8(10010010),
B8(11111110),
B8(10000000),
B8(00000000),
B8(00000000),
B8(00000000),
B8(00000000),
B8(00000000),
B8(00000000),
B8(00000000),
B8(10001000),
B8(11111000),
B8(10010000),
B8(00001000),
B8(10001000),
B8(11110000),
B8(10000000),
B8(00000000),
B8(10001000),
B8(10001000),
B8(11111010),
B8(10000000),
B8(10000000),
B8(00000000),
B8(00000000),
B8(00011100),
B8(10100010),
B8(10100010),
B8(10100100),
B8(01111110),
B8(00000010),
B8(10000010),
B8(11111110),
B8(10010000),
B8(00001000),
B8(10001000),
B8(11110000),
B8(10000000),
B8(00001000),
B8(01111100),
B8(10001000),
B8(10001000),
B8(10001000),
B8(01000000),
B8(00000000),
B8(00000000),
};

// special pointer for reading from ROM memory
PGM_P largeimage_p PROGMEM = large_image;

#define NUM_ELEM(x) (sizeof (x) / sizeof (*(x)))
int imagesize = NUM_ELEM(large_image);



// this function is called when timer1 compare matches OCR1A
uint8_t j = 0;
SIGNAL( SIG_TIMER1_COMPA ) {
  if (j >= imagesize)
    j = 0;

  // read the image data from ROM
  PORTB = pgm_read_byte(largeimage_p + j);

  j++;
}

int main(void) {

  DDRB = 0xFF;       // set all 8 pins on port B to outputs

  /*
    the frequency of the interrupt overflow is determined by the
    prescaler and overflow value.
    freq = clock_frequency / ( 2 * prescaler * overflow_val)
    where prescaler can be 1, 8, 64, 256, or 1024
    clock_freq is 8MHz
    and overflow_val is 16bit

    the overflow value is placed in OCR1A, the prescale is set in TCCR1B
    so for example:
    A good POV frequency is around 400Hz
    desired freq = 400Hz
    clock freq = 8MHz
    8MHz / (400Hz * 2) = 10000
    since 10000 is less than 655536 (largest 16 bit number)
    OCR1A = 10000 and the prescale is 1
  */

  TCCR1B = (1 << WGM12) | TIMER1_PRESCALE_1;
  OCR1A = (uint16_t)10000;

  TIMSK |= 1 << OCIE1A;   // Output Compare Interrupt Enable (timer 1, OCR1A)

  sei();                 // Set Enable Interrupts

  while (1);
}



[magician13134]

Can you put the code it generated into a

Code: Select all

[code][/code]

tag?

[aurbo99]

I was just doing that when you posted.. =)

[aurbo99]

Carefully reviewing our setup, traces, solder joint and parts.

We are using a 20PU on the POV2 and a 10PU on the POV3

while the text is working fine on the 10PU, the 20PU does not like the speed or something.

Swapping the chips between units and programming several different words proves to me at least the 20PU is the issue.

What can be done to allow the 20PU to work like the 10PU?

[magician13134]

Hmm, the code looks fine. Are the firmware for the MiniPOV2 and 3 the same? You may want to open one of the sample codes (use largeimage.c I think it's called) and just copy all the "B8(.......);"s over the ones in that code.

Oh. After reading your last post... Did you burn the same fuses on each one? I'm not sure if they're supposed to be the same or not... That was really helpful
Fuses have always been my Achilles' Heel...

[aurbo99]

Burning a new 10PU, its now acting like the 20PU..

Perhaps I've not set the fuses right.


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