Results for

Fun

Walter Roberson
Last activity about 21 hours ago

I'm famous ;-)

I can't believe someone put time into this ;-)

ThingSpeak

Peter
Last activity about 20 hours ago

Did something change on ThingSpeak server on 4 Dec 2025?

Hi everyone

I've been using ThingSpeak for several years now without an issue until last Thursday.

I have four ThingSpeak channels which are used by three Arduino devices (in two locations/on two distinct networks) all running the same code.

All three devices stopped being able to write data to my ThingSpeak channels around 17:00 CET on 4 Dec and are still unable to.

Nothing changed on this side, let alone something that would explain the problem.

I would note that data can still be written to all the channels via a browser so there is no fundamental problem with the channels (such as being full).

Since the above date and time, any HTTP/1.1 'update' (write) requests via the REST API (using both simple one-write GET requests or bulk JSON POST requests) are timing out after 5 seconds and no data is being written. The 5 second timeout is my Arduino code's default, but even increasing it to 30 seconds makes no difference. Before all this, responses from ThingSpeak were sub-second.

I have recompiled the Arduino code using the latest libraries and that didn't help.

I have tested the same code again another random api (api.ipify.org) and that works just fine.

Curl works just fine too, also usng HTTP/1.1

So the issue appears to be something particular to the combination of my Arduino code *and* the ThingSpeak environment, where something changed on the ThingSpeak end at the above date and time.

If anyone in the community has any suggestions as to what might be going on, I would greatly appreciate the help.

Peter

Fun

Zhaoxu Liu / slandarer
Last activity on 3 Dec 2025 at 1:02

It's simply amazing that such a cool cybernetic digital life was generated with just a few lines of code!!

The formula comes from @yuruyurau. (https://x.com/yuruyurau)

digital life 1

figure('Position',[300,50,900,900], 'Color','k');
axes(gcf, 'NextPlot','add', 'Position',[0,0,1,1], 'Color','k');
axis([0, 400, 0, 400])
SHdl = scatter([], [], 2, 'filled','o','w', 'MarkerEdgeColor','none', 'MarkerFaceAlpha',.4);
t = 0;
i = 0:2e4;
x = mod(i, 100);
y = floor(i./100);
k = x./4 - 12.5;
e = y./9 + 5;
o = vecnorm([k; e])./9;
while true
    t = t + pi/90;
    q = x + 99 + tan(1./k) + o.*k.*(cos(e.*9)./4 + cos(y./2)).*sin(o.*4 - t);
    c = o.*e./30 - t./8;
    SHdl.XData = (q.*0.7.*sin(c)) + 9.*cos(y./19 + t) + 200; 
    SHdl.YData = 200 + (q./2.*cos(c));
    drawnow
end

digital life 2

figure('Position',[300,50,900,900], 'Color','k');
axes(gcf, 'NextPlot','add', 'Position',[0,0,1,1], 'Color','k');
axis([0, 400, 0, 400])
SHdl = scatter([], [], 2, 'filled','o','w', 'MarkerEdgeColor','none', 'MarkerFaceAlpha',.4);
t = 0;
i = 0:1e4;
x = i;
y = i./235;
e = y./8 - 13;
while true
    t = t + pi/240;
    k = (4 + sin(y.*2 - t).*3).*cos(x./29);
    d = vecnorm([k; e]);
    q = 3.*sin(k.*2) + 0.3./k + sin(y./25).*k.*(9 + 4.*sin(e.*9 - d.*3 + t.*2));
    SHdl.XData = q + 30.*cos(d - t) + 200; 
    SHdl.YData = 620 - q.*sin(d - t) - d.*39;
    drawnow
end

digital life 3

figure('Position',[300,50,900,900], 'Color','k');
axes(gcf, 'NextPlot','add', 'Position',[0,0,1,1], 'Color','k');
axis([0, 400, 0, 400])
SHdl = scatter([], [], 1, 'filled','o','w', 'MarkerEdgeColor','none', 'MarkerFaceAlpha',.4);
t = 0;
i = 0:1e4;
x = mod(i, 200);
y = i./43;
k = 5.*cos(x./14).*cos(y./30);
e = y./8 - 13;
d = (k.^2 + e.^2)./59 + 4;
a = atan2(k, e);
while true
    t = t + pi/20; 
    q = 60 - 3.*sin(a.*e) + k.*(3 + 4./d.*sin(d.^2 - t.*2));
    c = d./2 + e./99 - t./18;
    SHdl.XData = q.*sin(c) + 200; 
    SHdl.YData = (q + d.*9).*cos(c) + 200;
    drawnow; pause(1e-2)
end

digital life 4

figure('Position',[300,50,900,900], 'Color','k');
axes(gcf, 'NextPlot','add', 'Position',[0,0,1,1], 'Color','k');
axis([0, 400, 0, 400])
SHdl = scatter([], [], 1, 'filled','o','w', 'MarkerEdgeColor','none', 'MarkerFaceAlpha',.4);
t = 0;
i = 0:4e4;
x = mod(i, 200);
y = i./200;
k = x./8 - 12.5;
e = y./8 - 12.5;
o = (k.^2 + e.^2)./169;
d = .5 + 5.*cos(o);
while true
    t = t + pi/120;
    SHdl.XData = x + d.*k.*sin(d.*2 + o + t) + e.*cos(e + t) + 100;
    SHdl.YData = y./4 - o.*135 + d.*6.*cos(d.*3 + o.*9 + t) + 275;
    SHdl.CData = ((d.*sin(k).*sin(t.*4 + e)).^2).'.*[1,1,1];
    drawnow;
end

digital life 5

figure('Position',[300,50,900,900], 'Color','k');
axes(gcf, 'NextPlot','add', 'Position',[0,0,1,1], 'Color','k');
axis([0, 400, 0, 400])
SHdl = scatter([], [], 1, 'filled','o','w',...
    'MarkerEdgeColor','none', 'MarkerFaceAlpha',.4);
t = 0;
i = 0:1e4;
x = mod(i, 200);
y = i./55;
k = 9.*cos(x./8);
e = y./8 - 12.5;
while true
    t = t + pi/120;
    d = (k.^2 + e.^2)./99 + sin(t)./6 + .5;
    q = 99 - e.*sin(atan2(k, e).*7)./d + k.*(3 + cos(d.^2 - t).*2);
    c = d./2 + e./69 - t./16;
    SHdl.XData = q.*sin(c) + 200;
    SHdl.YData = (q + 19.*d).*cos(c) + 200;
    drawnow;
end

digital life 6

clc; clear
figure('Position',[300,50,900,900], 'Color','k');
axes(gcf, 'NextPlot','add', 'Position',[0,0,1,1], 'Color','k');
axis([0, 400, 0, 400])
SHdl = scatter([], [], 2, 'filled','o','w', 'MarkerEdgeColor','none', 'MarkerFaceAlpha',.4);
t = 0;
i = 1:1e4;
y = i./790;
k = y; idx = y < 5;
k(idx) = 6 + sin(bitxor(floor(y(idx)), 1)).*6;
k(~idx) = 4 + cos(y(~idx));
while true
    t = t + pi/90;
    d = sqrt((k.*cos(i + t./4)).^2 + (y/3-13).^2);
    q = y.*k.*cos(i + t./4)./5.*(2 + sin(d.*2 + y - t.*4));
    c = d./3 - t./2 + mod(i, 2);
    SHdl.XData = q + 90.*cos(c) + 200;
    SHdl.YData = 400 - (q.*sin(c) + d.*29 - 170);
    drawnow; pause(1e-2)
end

digital life 7

clc; clear
figure('Position',[300,50,900,900], 'Color','k');
axes(gcf, 'NextPlot','add', 'Position',[0,0,1,1], 'Color','k');
axis([0, 400, 0, 400])
SHdl = scatter([], [], 2, 'filled','o','w', 'MarkerEdgeColor','none', 'MarkerFaceAlpha',.4);
t = 0;
i = 1:1e4;
y = i./345;
x = y; idx = y < 11;
x(idx) = 6 + sin(bitxor(floor(x(idx)), 8))*6;
x(~idx) = x(~idx)./5 + cos(x(~idx)./2);
e = y./7 - 13;
while true
    t = t + pi/120;
    k = x.*cos(i - t./4);
    d = sqrt(k.^2 + e.^2) + sin(e./4 + t)./2;
    q = y.*k./d.*(3 + sin(d.*2 + y./2 - t.*4));
    c = d./2 + 1 - t./2;
    SHdl.XData = q + 60.*cos(c) + 200;
    SHdl.YData = 400 - (q.*sin(c) + d.*29 - 170);
    drawnow; pause(5e-3)
end

digital life 8

clc; clear
figure('Position',[300,50,900,900], 'Color','k');
axes(gcf, 'NextPlot','add', 'Position',[0,0,1,1], 'Color','k');
axis([0, 400, 0, 400])
SHdl{6} = [];
for j = 1:6
    SHdl{j} = scatter([], [], 2, 'filled','o','w', 'MarkerEdgeColor','none', 'MarkerFaceAlpha',.3);
end
t = 0;
i = 1:2e4;
k = mod(i, 25) - 12;
e = i./800; m = 200;
theta = pi/3;
R = [cos(theta) -sin(theta); sin(theta) cos(theta)];
while true
    t = t + pi/240;
    d = 7.*cos(sqrt(k.^2 + e.^2)./3 + t./2);
    XY = [k.*4 + d.*k.*sin(d + e./9 + t); 
          e.*2 - d.*9 - d.*9.*cos(d + t)];
    for j = 1:6
        XY = R*XY;
        SHdl{j}.XData = XY(1,:) + m;
        SHdl{j}.YData = XY(2,:) + m;
    end
    drawnow;
end

digital life 9

clc; clear
figure('Position',[300,50,900,900], 'Color','k');
axes(gcf, 'NextPlot','add', 'Position',[0,0,1,1], 'Color','k');
axis([0, 400, 0, 400])
SHdl{14} = [];
for j = 1:14
    SHdl{j} = scatter([], [], 2, 'filled','o','w', 'MarkerEdgeColor','none', 'MarkerFaceAlpha',.1);
end
t = 0;
i = 1:2e4;
k = mod(i, 50) - 25;
e = i./1100; m = 200;
theta = pi/7;
R = [cos(theta) -sin(theta); sin(theta) cos(theta)];
while true
    t = t + pi/240;
    d = 5.*cos(sqrt(k.^2 + e.^2) - t + mod(i, 2));
    XY = [k + k.*d./6.*sin(d + e./3 + t);
         90 + e.*d - e./d.*2.*cos(d + t)];
    for j = 1:14
        XY = R*XY;
        SHdl{j}.XData = XY(1,:) + m;
        SHdl{j}.YData = XY(2,:) + m;
    end
    drawnow;
end

ThingSpeak

Martinov
Last activity on 26 Nov 2025 at 14:24

How to duplicate field chart?

Hello,

I have Arduino DIY Geiger Counter, that uploads data to my channel here in ThingSpeak (3171809), using ESP8266 WiFi board. It sends CPM values (counts per minute), Dose, VCC and Max CPM for 24h. They are assignet to Field from 1 to 4 respectively. How can I duplicate Field 1, so I could create different time chart for the same measured unit? Or should I duplicate Field 1 chart, and how? I tried to find the answer here in the blog, but I couldn't.

I have to say that I'm not an engineer or coder, just can simply load some Arduino sketches and few more things, so I'll be very thankfull if someone could explain like for non-IT users.

Regards,

Emo

Fun

Ludvig Nordin
Last activity on 13 Nov 2025 at 1:24

Which is your favorite?

Pure Matlab

82%

Simulink

18%

11 votes

Fun

Toshiaki Takeuchi
Last activity on 7 Nov 2025

[LinkedIn post] Playing with more biological forms and the Nebula colormap in MATLAB

Jorge Bernal-AlvizJorge Bernal-Alviz shared the following code that requires R2025a or later:

Test()

Warning: Hardware-accelerated graphics is unavailable. Displaying fewer markers to preserve interactivity.

function Test()

duration = 10;

numFrames = 800;

frameInterval = duration / numFrames;

w = 400;

t = 0;

i_vals = 1:10000;

x_vals = i_vals;

y_vals = i_vals / 235;

r = linspace(0, 1, 300)';

g = linspace(0, 0.1, 300)';

b = linspace(1, 0, 300)';

r = r * 0.8 + 0.1;

g = g * 0.6 + 0.1;

b = b * 0.9 + 0.1;

customColormap = [r, g, b];

figure('Position', [100, 100, w, w], 'Color', [0, 0, 0]);

axis equal;

axis off;

xlim([0, w]);

ylim([0, w]);

hold on;

colormap default;

colormap(customColormap);

plothandle = scatter([], [], 1, 'filled', 'MarkerFaceAlpha', 0.12);

for i = 1:numFrames

t = t + pi/240;

k = (4 + 3 * sin(y_vals * 2 - t)) .* cos(x_vals / 29);

e = y_vals / 8 - 13;

d = sqrt(k.^2 + e.^2);

c = d - t;

q = 3 * sin(2 * k) + 0.3 ./ (k + 1e-10) + ...

sin(y_vals / 25) .* k .* (9 + 4 * sin(9 * e - 3 * d + 2 * t));

points_x = q + 30 * cos(c) + 200;

points_y = q .* sin(c) + 39 * d - 220;

points_y = w - points_y;

CData = (1 + sin(0.1 * (d - t))) / 3;

CData = max(0, min(1, CData));

set(plothandle, 'XData', points_x, 'YData', points_y, 'CData', CData);

brightness = 0.5 + 0.3 * sin(t * 0.2);

set(plothandle, 'MarkerFaceAlpha', brightness);

drawnow;

pause(frameInterval);

end

https://www.linkedin.com/feed/update/urn:li:activity:7392574790642913280/

Highlights

Chen Lin
Last activity on 20 Nov 2025 at 15:16

Join Cody Contest 2025 — Have Fun and Win Prizes!

We’re excited to invite you to Cody Contest 2025! 🎉

Pick a team, solve Cody problems, and share your best tips and tricks. Whether you’re a beginner or a seasoned MATLAB user, you’ll have fun learning, connecting with others, and competing for amazing prizes, including MathWorks swags, Amazon gift cards, and virtual badges.

How to Participate

Join a team that matches your coding personality
Solve Cody problems, complete the contest problem group, or share Tips & Tricks articles
Bonus Round: Two top players from each team will be invited to a fun code-along event

Contest Timeline

Main Round: Nov 10 – Dec 7, 2025
Bonus Round: Dec 8 – Dec 19, 2025

Prizes (updated 11/19)

(New prize) Solving just one problem in the contest problem group gives you a chance to win MathWorks T-shirts or socks each week.
Finishing the entire problem group will greatly increase your chances—while helping your team win.
Share high-quality Tips & Tricks articles to earn you a coveted MathWorks Yeti Bottle.
Become a top finisher in your team to win Amazon gift cards and an invitation to the bonus round.

Join now! Get ready to learn and have fun!

ThingSpeak

Diyorbek
Last activity on 28 Oct 2025

как я получил api Token

ThingSpeak

Mugdho
Last activity on 24 Oct 2025

Possible bug in MQTT Block (Simulink, MATLAB R2025b) – Password disappears after Apply

Hey everyone,

I’m currently working with MATLAB R2025b and using the MQTT blocks from the Industrial Communication Toolbox inside Simulink. I’ve run into an issue that’s driving me a bit crazy, and I’m not sure if it’s a bug or if I’m missing something obvious.

Here’s what’s happening:

I open the MQTT Configure block.
I fill out all the required fields — Broker address, Port, Client ID, Username, and Password.
When I click Test Connection, it says “Connection established successfully.” So far so good.
Then I click Apply, close the dialog, set the topic name, and try to run the simulation.
At this point, I get the following error:Caused by: Invalid value for 'ClientID', 'Username' or 'Password'.
When I reopen the MQTT config block, I notice that the Password field is empty again — even though I definitely entered it before and the connection test worked earlier.

It seems like Simulink is somehow not saving the password after hitting Apply, which leads to the authentication error during simulation.

Has anyone else faced this? Is this a bug in R2025b, or do I need to configure something differently to make the password persist?

Would really appreciate any insights, workarounds, or confirmations from anyone who has used MQTT in Simulink recently.

Thanks in advance!

Fun

Matt Tearle
Last activity on 13 Oct 2025

A Storie About MATLAB In Ye Olden Dayes: The joy of file naming standards (or lack thereof)

Inspired by @xingxingcui's post about old MATLAB versions and @유장's post about an old Easter egg, I thought it might be fun to share some MATLAB-Old-Timer Stories™.

Back in the early 90s, MATLAB had been ported to MacOS, but there were some interesting wrinkles. One that kept me earning my money as a computer lab tutor was that MATLAB required file names to follow Windows standards - no spaces or other special characters. But on a Mac, nothing stopped you from naming your script "hello world - 123.m". The problem came when you tried to run it. MATLAB was essentially doing an eval on the script name, assuming the file name would follow Windows (and MATLAB) naming rules.

So now imagine a lab full of students taking a university course. As is common in many universities, the course was given a numeric code. For whatever historical reason, my school at that time was also using numeric codes for the departments. Despite being told the rules for naming scripts, many students would default to something like "26.165 - 1.1" for problem one on HW1 for the intro applied math course 26.165.

No matter what they did in their script, when they ran it, MATLAB would just say "ans = 25.0650".

Nothing brings you more MATLAB-god credibility as a student tutor than walking over to someone's computer, taking one look at their output, saying "rename your file", and walking away like a boss.

Fun

xingxingcui
Last activity on 13 Oct 2025

Looking back at the first MATLAB version I use

It was 2010 when I was a sophomore in university. I chose to learn MATLAB because of a mathematical modeling competition, and the university provided MATLAB 7.0, a very classic release. To get started, I borrowed many MATLAB books from the library and began by learning simple numerical calculations, plotting, and solving equations. Gradually I was drawn in by MATLAB’s powerful capabilities and became interested; I often used it as a big calculator for fun. That version didn’t have MATLAB Live Script; instead it used MATLAB Notebook (M-Book), which allowed MATLAB functions to be used directly within Microsoft Word, and it also had the Symbolic Math Toolbox’s MuPAD interactive environment. These were later gradually replaced by Live Scripts introduced in R2016a. There are many similar examples...

Out of curiosity, I still have screenshots on my computer showing MATLAB 7.0 running compatibly. I’d love to hear your thoughts?

Fun

Nicolas Douillet
Last activity on 10 Oct 2025

Evolution

MATLAB

Toshiaki Takeuchi
Last activity on 25 Sep 2025

MATLAB Free Stuff made into a YouTube video by Christopher Lum!

Do you have a swag signed by Brian Douglas? He does!

https://www.youtube.com/watch?v=bJlryGNGDrw

Fun

Chen Lin
Last activity on 27 Oct 2025

What MathWorks Swag Do You Have?

I came across this fun video from @Christoper Lum, and I have to admit—his MathWorks swag collection is pretty impressive! He’s got pieces I even don’t have.

So now I’m curious… what MathWorks swag do you have hiding in your office or closet?

Which one is your favorite?
Which ones do you want to add to your collection?

Show off your swag and share it with the community! 🚀

Fun

Yann Debray
Last activity on 4 Sep 2025

MATLAB YouTube short

I saw this YouTube short on my feed: What is MATLab?

I was mostly mesmerized by the minecraft gameplay going on in the background.

Found it funny, thought i'd share.

Fun

Nicolas Douillet
Last activity on 2 Sep 2025

Matlab and the Matrix

Trinity

It's the question that drives us, Neo. It's the question that brought you here. You know the question, just as I did.

Neo

What is the Matlab?

Morpheus

Unfortunately, no one can be told what the Matlab is. You have to see it for yourself.

And also later :

Morpheus

The Matlab is everywhere. It is all around us. Even now, in this very room. You can feel it when you go to work [...]

The Architect

The first Matlab I designed was quite naturally perfect. It was a work of art. Flawless. Sublime.

[My Matlab quotes version of the movie (Matrix, 1999) ]

ThingSpeak

Harel
Last activity on 25 Aug 2025

Sampling rate and uploading,

Hi,

I have some problem, I want to upload my data that sample rate at 500HZ, every sevral seconds.

My data include 12 bytes, and it measure 500HZ, for example for 15 seconds I coolect 15*500*12 = 84KB.

Can I upload this data to ThingSpeak? It is possible to use with Free acount (I am student and this is my project)

How can help me..

Fun

Ceci
Last activity on 10 Sep 2025

MATLAB Cross Stitch!

I designed and stitched this last week! It uses a total of 20 DMC thread colors, and I frequently stitched with two colors at once to create the gradient.