# String not converted Properly from int
**URL:** https://discourse.processing.org/t/string-not-converted-properly-from-int/12295
**Category:** Electronics (Arduino, etc.)
**Created:** [June 26, 2019, 5:54am UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295 "2019-06-26T05:54:27Z")
**Posts on this page:** 16
**Page:** 1
### Author:  [@The\_nish](https://discourse.processing.org/u/The_nish)
#### Post date: [June 26, 2019, 5:54am UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/1 "2019-06-26T05:54:27Z")
post is deleted…
---
### Author:  [@kll](https://discourse.processing.org/u/kll)
#### Post date: [June 26, 2019, 10:22am UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/2 "2019-06-26T10:22:18Z")
now i did not test that with a arduino…
but the code runs here without device.
i started from the loadDisplayImage example
show a shrunk image with 50\*50
make a Black / White copy of it
print to console and send to serial
```auto
/**
* Load and Display
*
* Images can be loaded and displayed to the screen at their actual size
* or any other size.
*/
import processing.serial.*;
PImage img;
int ledW =50, ledH=50, s, point;
color ccompare, cimg, cset;
float fcompare, fimg;
Serial myPort;
void setup() {
size(640, 360);
colorMode(RGB, 100);
img = loadImage("moonwalk.jpg"); // Load the image from the data folder into the program
image(img,0,0);
image(img, 0, 0, ledW, ledH);
noLoop();
printArray(Serial.list());
myPort = new Serial(this, Serial.list()[0], 9600);
}
void draw() {
send_pix();
}
void send_pix() {
loadPixels(); // canvas
ccompare = color(50, 50, 50); // black white limit ( 50 of 100 )
fcompare = brightness(ccompare);
for (int y=0; y < ledH; y++) {
println();
print("y "+y+"_");
for (int x =0; x < ledW; x++) {
point = x+y*width;
s = 0;
cset=color(0);
cimg = pixels[point];
fimg = brightness(cimg);
if (fimg > fcompare) {
s = 1;
cset=color(100);
}
pixels[x+ledW+y*width]=cset; // make a B/W copy right of mini image
print(s);
myPort.write(s);
delay(2);
}
myPort.write('\n'); // try a line feed after sending ledW pix 1/0 ( to be understood in arduino )
}
updatePixels(); // show the B/W copy
}
```
---
### Author:  [@The\_nish](https://discourse.processing.org/u/The_nish)
#### Post date: [June 26, 2019, 11:13am UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/3 "2019-06-26T11:13:28Z")
post is deleted…
---
### Author:  [@kll](https://discourse.processing.org/u/kll)
#### Post date: [June 26, 2019, 12:07pm UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/4 "2019-06-26T12:07:52Z")
what is string in shape???
depending on the arduino code i recommend using lines,
so a line of pixels gives a line of string to arduino,
but sure you can overlay your own pseudo protocol
start lines with
y=xx;0101010
( like i use at the console print )
and split on that “;” … in arduino
so you sure the data go to what ?led strip?
---
### Author:  [@The\_nish](https://discourse.processing.org/u/The_nish)
#### Post date: [June 26, 2019, 12:54pm UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/5 "2019-06-26T12:54:24Z")
please understand what i am trying to do
i have a 100 led strip connecting through arduino .
through processing i want to create a binary image of png extension. where 1 for black and 0 for other.
binary image is equal to orignal image and this image send by row wise to arduino.
row wise as a string beacuse in my arduino code i use function readString not readByte. ok
but problem is occured is that
binary image which pixels is in int form like i = x+y\*width.
i have a value of pixel 0 to 10000.
and i want to convert each pixel value in 0 and 1 form according to png image and this 0 and 1 value should be in string form and then this string read row wise data and send to the arduino.
i am not using int value of 0 and 1 because when i send data to arduino 8 bit is send at one time but i want to send 100 bit as a row one time.
thats all i want to try.
now i hope u can understand what i am trying to do.
so please help me yaar to get out of this problem .
---
### Author:  [@InferNova](https://discourse.processing.org/u/InferNova)
#### Post date: [June 26, 2019, 7:03pm UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/6 "2019-06-26T19:03:40Z")
I don’t have 100 LEDs but got a few I will give this a go !
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### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 26, 2019, 7:51pm UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/7 "2019-06-26T19:51:37Z")
Your code needs some work.
`String s = str(i);` is only one character so q[] is only a one element array; it still prints and outputs but there is a lot of unnecessary code.
I have this working…
You really need to simply the code and make sure output to console and file is what you expect before doing a myPort.write();
Here is a simple ping file to work with:
int i= x+y\*width; is not correct, **width** in this case is **width of screen** and not the image.
🙂
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 26, 2019, 8:07pm UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/8 "2019-06-26T20:07:24Z")
An example that draws to screen.
I removed all the console prints and outputs to a file and leaving this as an exercise. 🙂
```auto
PImage img;
String s;
int j;
char p;
void setup()
{
size(400, 400);
img = loadImage("Simple.png");
img.loadPixels();
println(img.width, img.height);
println(img.pixels.length);
textSize(18);
}
void draw()
{
background(0);
function();
image(img, 0, 0);
noLoop();
}
void function()
{
for (int y=0; y
### Author:  [@kll](https://discourse.processing.org/u/kll)
#### Post date: [June 27, 2019, 1:22am UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/9 "2019-06-27T01:22:17Z")
-a- this sounds very much like the code i did in the above image example.
did you test and understand my code?
-b- the reduction from img.width,img.height to ledW,ledH you can adjust accordingly there
-c- the code used for serial is STRING ( ASCII ), so you not send a bit for a pixel,
a real text “0” or “1” and has to be treated in arduino like that
yes it is possible to send binary, but i think that’s some years too early for you,
pls stay with readable text what can also be tested from the arduino IDE monitor…
---
### Author:  [@The\_nish](https://discourse.processing.org/u/The_nish)
#### Post date: [June 27, 2019, 6:28am UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/10 "2019-06-27T06:28:13Z")
my above code is in running condition with processing and arduino. processing send 0,1 to arduino and led’s are blinking but in wrong order.
this kind of output i get into arduino.
my String continues print from 0 to 10000 it characters.
i want only limit it at 100 characters print at a time and form image correctly when i get ouput in notepad
---
### Author:  [@The\_nish](https://discourse.processing.org/u/The_nish)
#### Post date: [June 27, 2019, 7:04am UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/11 "2019-06-27T07:04:04Z")
ok thats great. but will u please tell me how this text value i can store as a string and how to take output as a .txt file thats will be very helpfull for me .
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### Author:  [@The\_nish](https://discourse.processing.org/u/The_nish)
#### Post date: [June 27, 2019, 7:26am UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/12 "2019-06-27T07:26:38Z")
ok i will wait .
share your ans. as soon as possible.
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 27, 2019, 12:00pm UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/13 "2019-06-27T12:00:59Z")
This is an example of how to create a string with random numbers.
```auto
String s;
char p;
void setup()
{
size(475, 475);
fill(0);
textSize(18);
}
void draw()
{
background(255);
s = function();
print(s);
println();
println();
for (int i=0; i<25*25; i++)
{
print (s.charAt(i));
if ((i+1)%25 == 0) println();
}
noLoop();
}
String function()
{
String s1 = "";
for (int y=0; y<25; y++)
{
for (int x=0; x<25; x++)
{
int i = x + y*25;
// println(i);
if (int(random(0, 2)) == 0)
p = 'X';
else
p = ' ';
s1 = s1 + p;
text(p, 25 + 10 + x*15, y*15 + 60);
}
}
return s1;
}
```
You should be able to write code to send this out the serial port and write to a text file with some effort.
I will leave the rest up to you.
Consider adding extra characters to string and check for those so you know when string starts and\or ends.
🙂
---
### Author:  [@The\_nish](https://discourse.processing.org/u/The_nish)
#### Post date: [June 27, 2019, 12:40pm UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/14 "2019-06-27T12:40:36Z")
can u update my above code.
i am trying your code but still it has same problem occur.
i am only want that
grid of string img.width and height without using \n or \r function . not in console window and not any window.
if i get this grid i can easily transfer each img.width as a row to arduino.
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [June 27, 2019, 5:16pm UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/15 "2019-06-27T17:16:50Z")
I will not update your code.
We have all shared working examples from which you can glean some insight on what you can do.
The rest is up to you.
[https://processing.org/reference/libraries/serial/index.html](https://processing.org/reference/libraries/serial/index.html)
[https://processing.org/reference/libraries/serial/Serial\_write\_.html](https://processing.org/reference/libraries/serial/Serial_write_.html)
Try doing a serial.write(src) where src is a String.
🙂
---
### Author:  [@The\_nish](https://discourse.processing.org/u/The_nish)
#### Post date: [June 28, 2019, 5:25am UTC](https://discourse.processing.org/t/string-not-converted-properly-from-int/12295/16 "2019-06-28T05:25:54Z")
yes you are right . all rest is up to me.
but i am saying my above code is in running condition and string is not getting shape of image when i send my code to arduino this type of string is sending and 100 serial led are blinking. .
i only want to check my code at least one time. and if you can please set in proper manner.
i am trying all my efforts and all your efforts are very nice. but only last time please check my above code in your processing ide.
i am not wanted to print image in console i wanted which image is printing in console that should be built in my code and send row by row to arduino.
please yaar help me .