ThingSpeak

Hello: Using the Timecontrol app, I want to execute a MatlabAnalysis recurring daily at 6:00 A.M. but execute it only ONCE. The MatlabAnalysis code performs a Thingspeakwrite() to a channel. I have the impression that the execution of this code is called multiple times during minute 00. I cannot write to a field more than every 30 seconds i believe. What can I do? Thanks in advance! Below is my MatlabAnalysis code: NHRS=6; disp(['process the last ' num2str(NHRS) ' hours of pool level measurements']); channelID = xxxxxx; [data timestamps]= thingSpeakRead(channelID, 'NumPoints', 100, 'Fields', 5); ts=timestamps; indx=find(~isnan(data)); data1=data(indx); ts1=ts(indx); [N dummy]=size(data1); [data2]=data1(N-NHRS+1:N); ts2=ts1(N); %disp('last 24 pool data levels'); %disp(data2); disp(' '); disp('time stamp of last pool level measurement'); disp(ts2); % Calculate the average avgValue = mean(data2); % display the aveage disp(['mean: ' num2str(avgValue) ' cm']); % calcul the std deviation sd=std(data2,1); %display the std deviation disp(['sd: ' num2str(sd) ' cm']); thingSpeakWrite(xxxxxx,[avgValue,sd],'WriteKey','xxxxxx');

Hi there, Is there a change in the json response when I do http write to a channel ? I send: POST /update.json HTTP/1.1 Content-Type: application/x-www-form-urlencoded Host: api.thingspeak.com Connection: close Content-Length: 102 apikey=xxxxxxxxxxxx&field1=-4.803&field3=18&field4=91&field5=109&field6=56&field7=0&field8=7 and I don't receive the normal response I get sth like: 'unsafe-eval'; style-src 'self' https: 'unsafe-inline'; connect-src 'self' https: https://*.mathworks.com https://*.thingspeak.com https://*.omtrdc.net https://*.demdex.net; frame-src 'self' https: https://*.mathworks.com json response Do you mean a change from what is written in the doc? I'm not aware of any changes from the published doc. Yes, It looks different I don't see any "created_at": " I use this to extract the time Here's my CURL request: curl --request POST --url https://api.thingspeak.com/update.json --header 'Content-Type: application/x-www-form-urlencoded' --data api_key=REDACTED_API_KEY --data field1=34959 or the version of it with the params sent in the query parameters: curl --request POST --url 'https://api.thingspeak.com/update.json?api_key=REDACTED_API_KEY&field1=23423' --header 'Content-Type: application/x-www-form-urlencoded' and the response I get back: {"channel_id":2778777,"created_at":"2026-11-05T15:21:39Z","entry_id":15,"field1":"34959","field2":null,"field3":null,"field4":null,"field5":null,"field6":null,"field7":null,"field8":null,"latitude":null,"longitude":null,"elevation":null,"status":null} This matches the documented behavior. Can you please share your CURL request (with your channel's API keys redacted)? Hi, curl works fine.I also tried postman which also response well. The device (gsm gprs module) does not receive proper data. And this first happens at 10/10/2026. Regards. curl -k --request POST --url https://api.thingspeak.com/update.json --header 'Content-Type: application/x-www-form-urlencoded' --data api_key=A2KUER9Z4GQ18ZFY --data field1=0 {"channel_id":3402447,"created_at":"2026-11-05T15:52:34Z","entry_id":3039,"field1":"0","field2":null,"field3":null,"field4":null,"field5":null,"field6":null,"field7":null,"field8":null,"latitude":null,"longitude":null,"elevation":null,"status":null} json response

This curriculum module uses interactive examples to teach problem-solving from a systems-thinking perspective in engineering.

Hello everyone, I am new to Matlab. I am trying to create an app to export the 5th column into a new sheet in the imported Excel file when I click Export button. How can I write code in ExportButtonPushed classdef test < matlab.apps.AppBase % Properties that correspond to app components properties (Access = public) UIFigure matlab.ui.Figure ExportButton matlab.ui.control.Button UITable matlab.ui.control.Table ImportButton matlab.ui.control.Button end % Callbacks that handle component events methods (Access = private) % Button pushed function: ImportButton function ImportButtonPushed(app, event) [file, location] = uigetfile( ... {'*.xlsx;*.xlsm', 'Excel files'; '*.txt', 'Text files'; '*.*', 'All files'}, ... 'File Selector'); figure(app.UIFigure) if isequal(file, 0), return, end fullPath = fullfile(location, file); try [~,~,ext] = fileparts(fullPath); if any(strcmpi(ext, {'.xlsx','.xlsm','.xls'})) T = readtable(fullPath, 'Sheet', 1, 'VariableNamingRule', 'preserve'); else T = readtable(fullPath, 'VariableNamingRule', 'preserve'); end catch ME uialert(app.UIFigure, ME.message, 'Read error'); return end if width(T) < 5 uialert(app.UIFigure, 'The file needs at least 5 columns.', 'Import error'); return end app.UITable.Data = T; app.UITable.ColumnName = T.Properties.VariableNames; lengthlist = T{:,5}; end % Button pushed function: ExportButton function ExportButtonPushed(app, event) Export to excel

All my thingspeak channels has stopped receiving data at 3.00am this morning. Is there any problem with Thingspeak?

I`ve downloaded my channel data to make a correction in one entry, cleared the channel, and when I tried to upload de csv file to reload de feed, it does not work, channel remains empty

We use Timecontrol for statistic automations. Yesterday at 2026-10-220 10:00pm CET Time control stopped working. There is new new time in the "Run At" field, although the script should run every 5 minutes. We had the same problem in September, see https://de.mathworks.com/matlabcentral/answers/2184870-thingspeak-timecontrol-stopped-working-at-all?s_tid=srchtitle Has anybody also prolems with Timecontrol? Thingspeak - Timecontrol stopped working Thanks for pointing out that last thread. Im sad to see i didnt respond once things were all fixed. Sorry about that. My time controls are also failing. The team reports an error in the last upgrade has caused this problem and they are working on a fix. I sincerely plan to and hope I remember to post here when I hear more. and watch this answer for more info too. same for me. Heating system now back and working Everything seems to be back to normal now. Feel free to share if you are still having issues.

Hello, since this morning (around 8h00 am, Paris time), data sent by my iots is not recorded. I have not changed any settings on my iots and my internet connection is OK. On the page with my channels, it seems that the channels are updated because I see that the "updated" times are evolving. Is there a problem today with Thingspeak?

I have data from TTN (The Things Network) coming in to Thingspeak channel C1, populating field1 thru field8. TTN is using a webhook, W1, to send the data from node N1 to ThingSpeak. I am adding a new node, N2, in the same TTN "application". I want its data to populate a new ThingSpeak channel, C2. How can I ensure that N1 data goes to only to C1 and N2 data goes only to C2? When I tried this I created a new webhook W2 for C2 (in same TTN application as W1), but the field1 data from N1 goes to field1 in C1 and to field1 in C2. (and similarly for all the other fields). One solution is to put node N2 into a new TTN application and create a new webhook there, but thats not ideal. Is there any way around this?

I have some Matlab code I wrote for a ThingSpeak visualization a while back. I'm finding that I can't use clipboard commands to copy or paste text into the text area when editing a visualization. Neither keyboard shortcuts nor selecting and right-clicking text allow me to successfully copy or paste the text. Is this a bug? How are you supposed to manage the visualization code?

Hi, I am experiencing an issue with my channel. The "Clear Channel" function is not working for me. I triggered the clear action more than 30 minutes ago, but the data is still present and the charts won't clear.

Hi everyone, I am experiencing a critical issue with one of my MATLAB Visualizations (App ID: 684176). Two days ago, everything was working perfectly, but now the public URL only renders the grid, axis labels, and the legend – the actual data curves are completely missing (blank plot area). Here is the technical breakdown of what I have verified and tested so far to rule out standard errors: Code & Data execution: Inside the MATLAB Visualizations editor, clicking "Save and Run" works flawlessly. The plot displays both curves correctly. Checking disp(size(data)) in the editor output returns 400 2, confirming that the script successfully pulls 400 data points across 2 variables from the channel. Channel & Key settings: The underlying channel is set to public, and the correct Read API Key is explicitly defined in the script using single quotes. App Privacy: The "Create a public URL" checkbox is enabled. However, testing the public URL in a private/incognito browser window results in the error message: "The author made this visualization private." This occurs even though the box is checked in the backend and the script was resaved. Local Browser Issues: We ruled out local browser cache, extensions, and ad-blockers. The issue persists across different browsers (Firefox, Chrome, Edge), on different devices (PC and mobile via cellular network), and after performing hard refreshes (Ctrl + F5) with browser tracking protection completely disabled. Server-Side Cache Reset: I have tried toggling the "Create a public URL" checkbox off and on, modifying minor code properties (like changing the LineWidth to force a redraw), and re-saving the script. The server still returns the same empty grid on the public link. It seems like there is a synchronization or backend rendering bug between the logged-in session/MATLAB editor and the anonymous public worker instance for this specific App ID. Could a forum administrator or support engineer please look into why the public rendering worker is failing or treating this specific visualization as private? Thank you in advance! /

Hello, I am developing a Smart Bin monitoring project using an ESP32, ThingSpeak, and MATLAB Analysis. I want to receive an email notification whenever the bin fill level reaches 70%. I created an Alerts API Key and used it in my MATLAB Analysis code. The code reads Field 1 from my ThingSpeak channel and sends an alert when the fill level is at least 70%. However, I have not received the email. I checked the following: The registered email address in my ThingSpeak account is correct. I checked my Inbox and Spam folder but could not find the email. The ThingSpeak Alerts History API returns the following: Subject: Smart Bin Fill Level Alert Status: sent Requested at: 2026-10-18T09:14:39.774Z Sent at: 2026-10-18T09:14:40.036Z The alert allowance also decreased by one after testing. Despite this, the email has not arrived. Could someone explain how to troubleshoot this issue and determine whether the email was actually delivered or rejected? Thank you.

For the past several days I have been experiencing a problem with data visualization on two of my ThingSpeak channels. The data appears to be uploaded and stored correctly, and new entries are still being added to the channels. However, the visualizations are not working correctly. The standard Field Charts show only a very small number of data points instead of the normal continuous measurements. Most of the points are compressed on the left side of the chart, while one or a few points appear far to the right and are connected by long straight lines. The time axis is also incorrect and sometimes shows repeated dates such as “01 Jan”. The numeric widgets are affected as well and display incorrect values. Some custom visualizations also remain blank or fail to load. The problem appeared suddenly and affects two separate channels which had previously been working correctly. I did not make any significant changes to the channels before the problem started. This seems somewhat similar to the ThingSpeak chart/timeline issue reported in June 2026, when charts were displaying incorrect time ranges and the DAYS/RESULTS settings were not working correctly. However, my current problem also affects numeric widgets and custom visualizations, and the charts show incorrect dates and strangely positioned data points. Could this be a regression or a similar issue with the ThingSpeak visualization system? Has anyone else experienced the same problem recently? ThingSpeak charts and widgets displaying incorrect data Sorry to hear things arent working so great. I checked one of my channels, and the field charts thre seem to be working fine. Sucessfully changed the days setting. Is your channel public? If so can you share it? Is anyone else seeing this issue? @Piotr What do you see if you export the data in your channels as a CSV and look at the data in a text editor? Do the timestamps and the values in the fields seem correct? Public channel I think I see the issue. Somehow your channel has been updated with data very far in the future. For example, the latest point I see in your chart is labelled from the year 2054. I've done this accidentally myself before. Presumably, you are updating your channel using "created at" parameter instead of using the system timestamp provided when you update without this parameter. Perhaps your microprocessor had an overflow and placed odd digits in the timestamp. There are a few fixes that I can think of. Download the data, then delete the channel feed and start clean Download the data, delete the offending points, clear the channel feed, and upload the old cleaned data. Leave the data as is, but use the start and end parameters from the charts api in your call. You can delete the field charts on you channel view and replace them with custom visualizations that use the charts API or another custom MATLAB visualization. Start writing to a different channel. Unfortunately, there is no selective delete available in ThingSpeak. i have checked csv file, fpund couples line wigh wrong year. dont use 'created at'. my microcomputer send package to thingspeak wothout time stamps. can you share the code that is running on your microprocessor? we may be able to provide insights based on that . sorry for confiusing. i check the latest version and fpund out tjat i was mistalen earlier. l am actually using tjr created at parametr when sending data to Thingspeak. Each measutement are stotrd with ots time stamp and that timr stamp is later semt to Thingspeak. So the incorrect dates in the channel may indeed originated from the timestamp gemerated by the device befor the data are uploaded. I am now cheking tjr code responsible for generating and formatting these timestamps to find out why occasionaly dates such as 2010, 2037, 2053 or 2054 appear in the data

Hello MathWorks Community / Support, I am experiencing a critical authentication issue where I am completely unable to log into my MathWorks and ThingSpeak account using my university student credentials. Every time I attempt to sign in using my institutional email (Central University of Technology, @stud.cut.ac.za), the screen displays the message: "You are about to log in through your organization portal page." Immediately after this message appears, the authentication script completely freezes or hangs on a blank loading screen, failing to ever redirect or open my university's login page. Here is what I have already tried to resolve the issue: • Cleared browser cache, cookies, and local/session storage for both mathworks.com and thingspeak.com. • Attempted the login using both Google Chrome and Brave browsers (including Guest mode and Incognito windows). • Switched networks from local Wi-Fi to a mobile data hotspot to rule out local firewall/DNS blocks. • Changed my Microsoft organization security defaults away from Windows Hello passkeys to standard push notifications to avoid background iFrame blocking. • Tested a personal MathWorks account on the same machine, which works flawlessly. The freeze only happens when the system tries to initiate the SSO handshake with my university's domain. It appears the script or OAuth link between MathWorks and my institution's identity provider is failing to execute. Could you please advise if there is a known issue with the Central University of Technology (CUT) institutional portal integration, or if there is a specific alternative endpoint I can use to bypass this loop and link my account? Thank you for your assistance.

Hey, this is a safe space to share your cool projects you know. I have pet ducks, I use ThingSpeak to open the door to their house each morning. I just finished an upgrade to the LED strip lights on my driveway that are controlled via ThingSpeak. And the valves for my drip irrigation system. You got it. Controlled by ThingSpeak. Let me know your last cool project you finished or the one you keep dreaming of starting. I need some more inspiration :) What's your ThingSpeak? I use a MATLAB Analysis app on ThingSpeak to retrieve the image from an ESP32CAM running some simple firmware that grabs an image from an OV2640 camera module that is pointed at my water meter. This MATLAB Analysis app is hooked up to a TimeControl to do this periodically. The MATLAB Analysis app applies OCR to recognize the digits in the image of the face of the water meter and uses the ThingSpeak Alerts API to send me emails when I need to investigate any surges in water usage.

I use "Thingspeak - Timecontrol" for home statistic automation since month. But beginning yesterday (8. Sept. 2026, 6 PM), all my 4 timecontrol timer (every 5-20 minutes) do not react at all. No yellow or red warning shield next to them. They are not just skipted once, there ist no new time in the "Run At" field. The "Last Run" is old. I tried to wake them up (kind of repair) making a littel change to the timer and saving. And I also created completly new timer with one-time-run and/or recurring - all with no success. The Matlab-Analysis scripts behind the timers where not changed yesterday. When I run them manually everything is fine. Has anybody also problems with Timecontrol not running anymore? Thank you for help suggestions or confirmations. Greetings, Bert

Hello - I have a new account and when I click My Channels, I don't get a drop down menu with choices like My Channels, My Image Channels, ect. I only get Public Channels when I click the Channels tab. I can't select My Channels. Could someone please help me? Thank you My Channels in Thingspeak Thank you for positng, we are aware of the isssue, please follow this answer for the most up to date information. ok The fix was deployed back in May 2023. Ok my

Buenas tardes. Tengo un problema desde hace días, que no sé cómo solucionar. He estado peleándome con él, pero no consigo dar con la solución. Describo el problema, a ver si hay alguien que pueda echarme un cable para solucionar el tema. A mi ya se me han acabado las ideas y posibiidades de buscar soluciones. Tengo una estación meteorológica que funciona con una Wemos D1 Mini Pro (ESP8266) y envía datos a un canal de ThingSpeak desde hace varios años. Desde hace poco he detectado un comportamiento extraño que apareció después de un problema/incidencia relacionada con ThingSpeak. Antes de ese problema, el funcionamiento era normal. Funcionamiento anterior La Wemos realiza una lectura periódica y envía los datos a ThingSpeak aproximadamente cada hora. Si reiniciaba la Wemos o la desconectaba y volvía a conectarla, la hora de las siguientes lecturas cambiaba en función del momento en que se había reiniciado. Es decir, la cadencia de las entradas del canal dependía claramente del momento en que la Wemos volvía a ponerse en funcionamiento.Comportamiento actual Ahora aparecen en el CSV del canal dos secuencias de entradas diferentes: Una secuencia con una hora prácticamente fija, por ejemplo alrededor de xx:36. Otra secuencia cuya hora va cambiando progresivamente, por ejemplo: 01:39:51 02:37:09 03:34:09 04:30:57 05:27:48 06:24:31 07:21:47 08:18:53 09:17:10 10:14:52 11:11:39 12:08:39 13:07:23 Por tanto, parece existir una segunda cadencia que se va desplazando progresivamente.Pruebas realizadas He realizado varias pruebas para intentar localizar el origen: Se ha sustituido la Wemos original por otra Wemos diferente. Se ha probado con diferentes valores de ESP.deepSleep. Posteriormente se ha vuelto a instalar la Wemos original. La sustitución de la Wemos se realizó aproximadamente a las 13:15, pero no apareció una nueva cadencia de lecturas a partir de esa hora. La secuencia fija alrededor de xx:36 continuó funcionando. También he revisado las aplicaciones configuradas en ThingSpeak: TimeControl MATLAB Analysis Script “Tres gráficas” Script “Cálculo Temp. Máx i Mín” Script “Cálculos diversos” Se realizaron pruebas comentando temporalmente distintas líneas de escritura thingSpeakWrite en los scripts MATLAB. Por ejemplo, al comentar una línea de escritura en uno de los scripts, desapareció una de las secuencias, pero la otra continuó apareciendo. Sin embargo, después de restaurar la configuración original, el comportamiento vuelve a ser el mismo: continúan existiendo las dos secuencias.Lo que me resulta especialmente extraño Antes del problema, al reiniciar la Wemos, la hora de las entradas posteriores cambiaba en función del momento del reinicio. Ahora puedo sustituir físicamente la Wemos por otra y la secuencia fija del canal continúa con su propia cadencia, independientemente del momento en que se ha instalado la nueva Wemos. Por este motivo sospecho que podría existir algún proceso, automatización, ejecución pendiente o configuración dentro de ThingSpeak que esté generando o escribiendo datos en el canal. Mi pregunta ¿Existe alguna forma de comprobar todas las fuentes o procesos que están escribiendo datos en un canal de ThingSpeak? ¿Puede un canal tener algún proceso interno, TimeControl, MATLAB Analysis u otra automatización que continúe ejecutándose y escribiendo datos aunque la configuración visible haya sido modificada? ¿Existe algún registro o log que permita identificar qué proceso ha creado cada entrada del canal? El objetivo es identificar el origen de estas dos secuencias y determinar qué está generando la segunda serie de entradas. Muchas gracias, y gracias por la atención y la ayuda. Salu2 cordiales.

It’s very strange, as I’ve been using ThingSpeak without any issues for years. I enter the data directly. I’ve just made the channel public (ID 2610618) so it can be checked. The same thing is happening with my husband's channel; he also cleared the data from his account (ID 1256514).

Hola a todos. A pesar de tener una conexión de red estable, últimamente estoy teniendo muchos problemas con la recepción de datos en ThingSpeak, estos se reciben de forma esporádica y aleatoria, cuando el intérvalo de envío de datos es de 30 segundos, he probado alargar el intervalo sin mejorar los resultados. He borrado los datos anteriores por si fuera un problema de desbordamiento de capacidad. ¿Que puedo hacer?. Gracias.

Title: Prolonged MQTT connection failures (30-60+ min) to mqtt3.thingspeak.com despite correct config and confirmed-healthy network Hi all, I'm running an industrial IoT gateway (WECON V-BOX, Lua scripting) publishing energy metering data (PM710 meter via Modbus RTU) to a private ThingSpeak channel over MQTT (mqtt3.thingspeak.com:1883), on a 4G cellular connection, one publish per 60s cycle. Setup: - QoS 0, CleanSession=1, no Will flag, correct topic format (channels/<id>/publish) - Update rate well within the free/student license limit (60s vs 15s minimum) - Persistent MQTT connection with a preventive renewal every 15 publications (close + recreate the client object) - Tested keepalive=60 and keepalive=90 (both with the same underlying issue) Symptom: intermittently, the client gets stuck failing to (re)connect for extended periods -- I've logged individual episodes lasting 8, 27, and even 58 minutes, with repeated connect() attempts returning "Operation failure" every cycle, before eventually recovering on its own without any configuration change. What I've already ruled out: - Site/cellular connectivity: I have an independent, parallel monitoring path (WECON's own V-NET platform, reading the same gateway but NOT going through MQTT/ThingSpeak at all) that shows ~99-100% data continuity during these exact windows where ThingSpeak shows 0% -- so the 4G link itself is healthy during these episodes. - Publish-side rejection: publish() succeeds 100% of the time when connected (no rejected messages, no rate-limit errors). - Basic MQTT config errors (checked against the official troubleshoot-MQTT-publish checklist: correct broker address/port, QoS 0, CleanSession=1, no Will flag). Questions: 1. Does ThingSpeak's MQTT broker enforce any rate limit or temporary lockout on CONNECT attempts (as opposed to the documented publish rate limit)? I.e., could repeated failed connection attempts from the same client ID cause the broker to temporarily refuse further attempts? 2. Is there a known minimum time the broker needs to fully release a previous session (same Client ID, CleanSession=1) before accepting a new CONNECT, beyond what a normal disconnect()/close() sequence would provide? 3. Are there known issues or best practices specific to WECON V-BOX / embedded Lua MQTT clients connecting to ThingSpeak? 4. Is there any server-side logging or status page I could check for a specific device/client ID to see the broker's-eye view of why a CONNACK was refused during one of these episodes? Any pointers, even partial, would be much appreciated -- this is for a doctoral research project measuring IoT gateway availability, so I have detailed logs (timestamps, consecutive failure counts, episode durations) if that's useful context. Thanks in advance.

The upload vanished and I have no idea what happened. The battery voltage is still elevated, Even in case of theft there should be readings. The device planted remoetely might have died. many thanks

How does MATLAB ThingSpeak Work ? How does MATLAB ThingSpeak Work ? There are functions built into MATLAB thingSpeakRead and thingSpeakWrite that allow you to read data from public channels and your ThingSpeak channels. The data you store in thingSpeak can come from an http or MQTT IOT device or from writes in MATLAB or from another HTTP enabled device (even your web browser). Start <here>

I was just reading our doc page on Kalman Filtering in MATLAB. This gave me an idea. Could I apply this to ThingSpeak IoT data? And, if so, why? Turns out we have a weather station at the MathWorks Apple Hill building. This weather station has been producing data for 10 years on ThingSpeak Channel 1...