Memory Experiments (continued)

I have two goals for this project:

Finish the VGA video recorder board (with op amps, bias pots, bias for ADC) – DONE!
Make a version of the vectorscope image modification series but with a raster system taking the following image as the input – DONE :

1. Finishing the VGA Video Sampler board

For the first goal, I need to correct that last board I made:

Errata:

-The gain pots for the op-amp don’t work.

-I mixed up VCC (3.3V) and VCA (5V) in several places. (I just replaced the PFET with the LDO and manually rewired)

-The “EN” text next to the ADC was in the wrong place.

-I forgot to tie down the reset of 74HC590 with a 10K resistor.

-The 74HC04 is labelled backwards, I put inputs on the right and outputs on the left for some reason.

Things appear to work with these changes:

It takes some knob fiddling but I can get an input sine wave digitalized. One definitely needs an oscilloscope to see what’s happening though.

2. Vectorscope image series

I can either load the image into memory by playing it on a computer screen and capturing the pixels, OR, loading the image into memory with a microcontroller. I’m not sure how big I should make the image, and what dimensions, if I load the image.

Here is the p5.js code to take an image (called p.jpg) and print the red pixel value into a text document (called OUTPUT) with a comma and space seperator :

let img;

function preload() {
img = loadImage('p.jpg');
}

function setup() {
createCanvas(img.width, img.height);
background(220);
image(img, 0, 0);
let writer = createWriter('OUTPUT.txt');

for(var y = 0; y < height; y++) {
for(var x = 0; x < width; x++){
let pix = img.get(x, y);
writer.write(pix[0] + ', '); // takes RED pixel info, adds a comma and a space
if(!(y==1-height || x==1-width))
{
writer.write(pix[0]); // don't put a comma if it's the last element of the list
}
}
}
writer.close();
}

And here is the Arduino code to take this color information and load it into the memory space (90×90 max as PROGMEM has max 8,192 bytes max):

byte myChar;

#define IMG_WIDTH 90
#define IMG_HEIGHT 90
//data size=900 bytes
const unsigned char img [IMG_HEIGHT*IMG_WIDTH] PROGMEM={
17, 19, 19, 19, 19, 20, 20, 20, 20, 20, 21, 23, 23, 22, 21, 21, 22, 22, 21, 22, 21, 22, 21, 20, 21, 21, 23, 23, 23, 23, 23, 23, 24, 23, 25, 23, 24, 23, 25, 25, 25, 25, 25, 24, 25, 26, 24, 23, 25, 24, 23, 24, 25, 21, 20, 24, 24, 23, 20, 20, 21, 23, 22, 22, 22, 22, 22, 23, 23, 24, 23, 23, 23, 25, 23, 24, 24, 23, 24, 25, 23, 25, 25, 23, 25, 24, 24, 25, 28, 28, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 19, 35, 25, 32, 32, 26, 27, 17, 23, 27, 30, 33, 33, 35, 37, 35, 29, 30, 34, 37, 44, 26, 30, 65, 65, 57, 56, 55, 57, 59, 42, 38, 46, 38, 33, 40, 41, 43, 46, 35, 3, 0, 0, 0, 0, 1, 1, 0, 9, 49, 18, 0, 4, 0, 0, 0, 3, 2, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 3, 29, 231, 255, 245, 252, 250, 247, 248, 240, 245, 249, 255, 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0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
// ARRAY OF PIXELS GOES HERE, COMMA + SPACE SEPERATED
};

void setup() {
pinMode (0, OUTPUT);
pinMode (1, OUTPUT);
pinMode (2, OUTPUT);
pinMode (3, OUTPUT);
pinMode (4, OUTPUT);
pinMode (5, OUTPUT);
pinMode (6, OUTPUT);
pinMode (7, OUTPUT); // PORT D

pinMode (8, OUTPUT); // WR PIN (inverted)


for (byte k = 0; k < strlen_P(img); k++) {

digitalWrite(8, LOW); // inverted so this puts WR HIGH (to read)
delay(10);

myChar = pgm_read_byte_near(img + k);
PORTD = myChar;

digitalWrite(8, HIGH); // inverted so this puts WR LOW (to write)
delay(10);

}
}
void loop() {
}

Success finishing the board and recording Palladio distorted by the board :

Here is the setup :

I’m currently using two boards, but soon I’ll have the components to put everything on the board to the left.

The techniques I’m using is the one developed in the previous post :

TO RECORD IN BURSTS: I can now save a short video : 695.45 kHz (This is the slowest I can go and still almost see an image) on the function gen AND’ed with the top 4 frequency divisions of the vertical sync. This makes for a burst of image recording every X number of frames. I then amplify the output to make it visible on screen (and speed the clock up to 695.48 kHz).

TO STOP THE IMAGE JUMPING: If the reset is connected to the inverse of the freq subdivision of the vertical sync signal AND’ed with the address 20, it will play the image in a loop and always place it in the same part of the screen !

EXPERIMENT : 1 bit recording

Recording a single bit of an image appears to produce almost the same image quality ! This means that in theory I could record 8 videos at the same time and output video to 8 screens simoultaneously !

EXPERIMENT : Loading an image with Arduino

Loading the tiny image once was a drop of water in the ocean so I recorded the image again and again until I ran out of space. This is taking a long time with a few 10ms delays in my code.

Here is the Arduino sending bits (captured after DAC) :

but so far nothing that comes out looking like an image on the other side…

I also can’t get my VGA to HDMI converter working…

Here’s an attempt at a grid of raster variations :

Here’s the final version of the board :