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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 How to duplicate field chart? Can you cliarify what you mean my "Duplicate Field 1"? Do you mean the settings on the field plot, like number of points and axis scale and so forth? If I understand your question correctly, I think the easiest way to do what you want is to use a custom visualization. Then you can copy the code for another custom visualization, but change the field you read data from. psuedo code: %Read data from channel field x myData=thingSpeakRead(...); %plot data plot(myData.timestamps,myData.xvals...); %adjust settings ylabel("dose"); You can use the MATLAB AI chat playground to help you generate the code for the custom visualization. I can also give you more description here if that is what you are interested in. You might also just be asking how to add a field plot. That you can do in the "add visualizations" button on the channel view page. Thanks for putting up the radiation levels. I built scintillation based dosimeters in a previous engagement, so I think it would be cool to have rad monitors on ThingSpeak from all over the world, kind of like all the weather stations. Yeah, you said it better - just wanted to add a field plot that uses the same field 1 data (red rectangle on the picture above). Currently, the plot set to use that field is showing readings for an one hour back. I want to make another plot, that uses the same field 1, but this time will set it to show reading for a week, or month etc. I hope I managed to explain it understandable. If not, sorry, I'm a physician, not a coder (if that's an excuse at all hahah). Yeah, lets make a custom visualization. Instructions are here. in general, click the green button that says MATLAB visualizations and click "create a 2d line plot". Then fill in the data and muck with the thingspeakread line to get the data you want [data, time] = thingSpeakRead(readChannelID, 'Field', fieldID1, 'NumPoints', 30, 'ReadKey', readAPIKey); In that line, you can change numpoints to numdays or numminutes to get the data range you want. You can then perform infinite customization on the plot. You can look in the documentation or use the AI chat playground i liked above to use natural language to describe what you want. Like "Give me a thicker line plot with red axis labels and a title of 'radiation plot' ". They the AI will show you the code you can copy into your visualization to get the plot you want (blue marker points, black background, inset close up etc.). When you are done, save and run, then it should show on your channel view. You can add multiple visualizations. They wont have the live update features of the thingspeak plots but you get way more options. If you definitely need the thingspeak plot, you can write code to copy the data to multiple fields in another channel and configure each field view how you like it. Lemme know if you need help with that. Many thanks for your answer! I'll try to figure out what's needed and how to work with the info you provided. AI is a good suggestion, since the coding needed here isn't sounds like rocket science. Yeah, it's still beyond my knowledge, but it looks very doable with some ai help. Will definitely give you a feedback. field chart duplicate

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

I am currently using the ThingSpeak API to upload bat detection data from my project. I am trying to set the created_at timestamp to match the date and time captured from the image filenames. However, despite sending the created_at field in ISO 8601 format (YYYY-MM-DDTHH:MM:SSZ) via JSON in a POST request, ThingSpeak still records the current upload time instead of the provided timestamp. Could you please clarify the correct way to send a custom timestamp so that ThingSpeak uses it instead of the current server time? Any guidance or examples would be greatly appreciated.

как я получил api Token как я получил api Token Do you mean user API token (to change account settings and add channels) or channel API tokens? The channel API tokens are used to read and write data in your channels.

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! Possible bug in MQTT Block (Simulink, MATLAB R2025b) – Password disappears after Apply We are aware of this issue and can confirm it is a bug. We are working on a fix, and should have it available in an upcoming update release. You can watch MATLAB Answers or bug reports to see when the fix is released. Thank you for reporting this issue. We acknowledge this as a bug and are actively working on a fix. You can monitor the progress through the Bug Report linked here. In the meantime, please try the workaround provided in the report. simulink mqtt r2025b

Is there a problem with Matlab Visualisations? My thingspeak matlab visualsations seem to be frozen and wont update when refreshed. If I manually go into the code and press save and run the updated data appears but not on my main public view page.

Hello everyone, I have a problem sending my email. It tells me I have a payment problem, but I already paid for the student license and I haven't used the 800 email limit. What can I do in this case?

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.. Sampling rate and uploading, It may be possible to upload this data to Thingspeak, even with the free account, but Im not sure its the right workflow. ThingSpeak is generally not optimized for high data rate applications. The data is live and sharable, but the database can be eventually cosistant, not immedeiately in some cases, especially with high data rate. The bulk update endpoing allows up to 960 messages per post approximentally every 15-20 seconds. Each field has 256 characters, for 8 fields and locations and status, you can get about 4kB in a single post. For 960 messages, you can do about 192 kB per second, so your data rate may be possible, depending on your network and device. However, as I said above, this may be difficulat to achieve. I would reccomend you do some proocessing on the edge device and reduce the data in your stream.

Sending temperature and humidity values to a thingSpeak channel using a NodeMCU(esp8266) and the ThingSpeak library. The problem is that the graphs do not update dynamically even if values are sent and received regularly. To update the graphs I have to refresh the page every time. The numeric displays and other widgets update regularly. How can I solve the problem? Graphs do not update dynamically I just did a quick scan this morning, the public view of the channel seems to udate with data for the field charts.Im not sure about the private view, it does seem to be lagging. I was able to observe this effect in an old channel I have, but not with a new channel. The recent bug that makes it impossible to change the chart settings may be at play here. If you chart was set to a slower refresh time, or had included longer averaging, the data might not refesh as you expect. When I created a brand new channel, I did not observe the same effect. So there are several temporary workarounds. I'm not sure if creating new field charts in your old channel will work, but certainly creating a completely new channel worked for me. If you do try creating new field charts in your channel, can you let us know how it goes here? The bug that is causing the effect will be removed in an upcomming release, so the need for a workaround is temporary. Thank you for your answer. At this moment the problem only affects private view. I deleted and then recreated the two graphs in private view, now it seems to work in private view too I have the same issues as the others. A channel last updated 2021-06-20 03:20 still works correctly ie charts and widgets. Another channel updated today 2024-01-22 03:14 has the issues with charts and widgets described by others. Two questions. If I delete the channel and then recreate it will I my Write and Read API Keys change? When will the update be released? From the post below, it seems you can simply delete the field plots and reinstate them to fix the problem. (I didnt try that yet) If you delete the channel, the API keys will definitely change. If I delete the charts and widgets and then recreate them it does not display as the original display. I am using MacOS 12.7.2 on a Mac Mini 2018 3 GHz 6-Core Intel Core i5 The browser is Chrome Version 120.0.6099.234 (Official Build) (x86_64) Charts do not update dynamically. Gauge widget now works correctly! The data is being uploaded each 30 sec from 2 x MKR 1010 WIFI with very similar software but different R/W API keys Attached are 3 images 1 and 2 A channel last edited/updated 2021-06-20 03:20 still receiving data uploads and displaying correctly. 2 the same channel showing the widgets correctly. 3 Another channel edited today after deleting all charts and widgets and recreating 5 of them. Previously the charts and widgets were similar to 1 and 2 (I have not edited the colours) No numeric display with the Gauge. (It displays correctly! but not in this screen shot) Yes,this make it work. Thanks. I did some try,and I find that ,if you want dynamically data view in the chart,you should set the "timescale" to "blank"(select the white space bar) and "dynamic" to "true".Otherwise ,it will not refresh the chart data. as this pic red frame indicated : You do not need to collect data for sufficient time before you set those parameters. Setting those parameters to non-null values may result in the plots only showing up once sufficient data is collected.

Hi, I am sending data from my device to the thingspeak server using HTTP and I'm trying to attach a timestamp with my uploads. I am using the created_at field in the request to set the time zone. A sample request looks like this http://api.thingspeak.com/update?api_key=xxxyyyzzz&field1=3407.866699&field2=0.000000&field3=0.000000&field4=0.000000&field5=0.000000&field6=0.000000&field7=0.000000&field8=0.000000&created_at=2021-02-17T15:34:00+05:30 I live in India and my timezone offset is 5 hours 30 min. When I specify it like as shown above, I can see in the private view of my channel that it is adding 5 hours 30 min to the given time zone. So this time stamp becomes 21:04. How do I fix this? Am I making some mistake in my time zone offset in created_at? Or is there some time zone setting that is not set properly in my channel? Thanks, Ashwin N Setting Time zone using "created_at" field Your channel uses your profile settings to change the UTC timestamps saved in ThingSpeak into your local settings. If you want the data to show up in your local time, you can write UTC timestamps without the +5:30 and your channel will show them properly. Is this the effect you are trying to achieve? I did the same. But not changing in the data displayed in my private channel. Please help Can you describe specifically your problem? I think we resolved the OPs problem by removing the offset. Does that work for you? I have same problem.Change the profile timezone have nothing to do with it .

Is there a hardware support package available for the MP series? Hardware Support Package for the MP Series

I'm facing an issue where my Thinkspeak graph is not displaying, even though I'm using exactly the same code as my friend. The code works perfectly in their Thinkspeak account, but not on mine. I've checked the API keys, channel settings, and data formats, but everything seems similar. Has anyone else faced this problem, or do you have tips on what to check next? Suggestions are welcome! Thinkspeak Graph Not Displaying While Same Code Works for Friend I would focus on the data formats. Perhaps try to read thier data instead of yours and then operate on it. Often times, spaces or weird characters in just one entry can muck up a whole read when MATLAB tries to figure out if something is a string or a number for example. The ThingSpeak platform is deterministic though, if everything is truly exactly the same, the output will be the same. Feel free to share some examples here, we can look at your stuff and see if we spot the issue. thinkspeak troubleshooting iot

Hi! I'm having trouble sending data to a channel using MQTT. I'm using a program that was working perfectly until just a few days ago, but after making some minor changes yesterday, it stopped working. I’ve also tested it manually using the MQTTX client. If I send data using CURL and GET, it works fine. It’s a bit strange... Thankfully, Ernesto. Is the MQTT server experiencing any problems? same here, publish via mqtt stopped working 11 hours ago.. thanks Also having issues. Have different location and devices. All stopped working basically about 24 hours ago. It is only those that publish on the mqtt server. The one that is on restful is working. Thanks Jacques Can you please try again. A subset of MQTT devices seems to have seen an issue publishing. We've restarted nodes in the system and can confirm things are back to 100% from our dashboards. Now is working for me Working again. Thank you. Can you explain how this problem occurred? Unplanned updates on the server instances fronting ThingSpeak's MQTT API caused some nodes in ThingSpeak's high-availability MQTT cluster to get into a bad state. These changes were unrelated to ThingSpeak application code, as evidenced by the REST API working faultlessly in @Ernesto's post. We worked with the platform provider to address the issue and have confirmed things are working correctly again for all clients of the MQTT API. This issue has occurred again and has lasted for 30 minutes. not for me, all ok after they restarted nodes yea thx The additional monitoring we put in place didn't see any issues on any nodes. Did you see any effects on multiple devices? If so, can you please send me an email with the channel numbers? mqtt

Hello, I am new to ThinkSpeak so thought I would try your example code for ESP8266 -- ThinkSpeak Channel. Have spent much time making sure all is installed and seems to compile, load and run on ESP8266 Node MCU. Channel is set up and have ID and Author ID I can see the channel but nothing noted. I am getting the above return on serial monitor. Any help very gratefully recieved, please.

Is it possible to create a Simulink model that is independent of specific microcontrollers? For example, in the model, the STM32 block is used for CAN transmission. But if I want to deploy the same model to an Arduino, I have to replace the STM32 block with an Arduino-compatible one. So, is it possible to create a custom block or abstraction that works across multiple microcontrollers like STM32, PIC32, and Arduino without changing the hardware-specific block each time? Model based Embedded development with Microcontrollers I believe you can use the Arduino Support Package, without needing to develop custom blocks. See this example.

Sto tentando inutilmente di salvare il valore dell'enegia che consumo ogni giorno nel field5 di questo canale: https://thingspeak.mathworks.com/channels/2851490 , ma inutilemte in quanto vengono visualizzati sempre e solo 2 dati anche se ho impostato days=30. Ho provato ad aumentare a 365 ma senza variazioni. Come mai? Registrare un solo dato ogni giorno I believe fields 1,2,3,4 and 6 of the channel are being updated every 15 seconds. Field 5 appears to be only be updated much less frequently. When the charts are drawn, they pull up to the last 8000 feeds from the channel and plot them. Note that this is NOT the same as pulling up to 8000 points per field and then doing the plot. If you want to see field5 values also on a per 15s basis, ensure that field 5 is also updated at the same rate as other fields in the channel. NO, essendo un dato che varia solo ogni 24 ore, vorrei che venisse visualizzato 1 dato ogni 24 ore non un dato ogni 15 secondi come gli altri feed. E' possibile fare questo ? It appears that perhaps you have multiple sources updating the same channel at different frequencies. I would recommend you set up a separate channel for the data that is only updated daily. The view on that channel will show the graph you are looking for.

I simply want to regenerate my password which I am forgotten of one of my MQTT devices.

Hello, I've successfully tested the Processor-in-the-Loop (PIL) workflow in Simulink using a TI F28069M LaunchPad, following the standard examples provided by MathWorks. The PIL block, code generation, and communication all worked without issues. Now, I’d like to run a similar PIL setup using the Infineon TLE9879 EVALKIT (based on an ARM Cortex-M0), which is not officially supported by Simulink as a target. I’m wondering if it’s possible to configure PIL manually or via custom workflows. For example: Can I create a custom PIL target using Embedded Coder? Would I need to port rtiostream manually for communication over UART? Could I somehow integrate with Keil µVision (which I use for TLE9879) to build and run the generated code? Is there a workaround to simulate PIL behavior using a non-supported board? My setup: Simulink R2024b Infineon TLE9879 EVALKIT Keil µVision 5 + Infineon Config Wizard UART and JTAG interfaces available The main purpose is to validate control algorithms and measure execution time, not to implement a full HIL system. Has anyone attempted PIL with a custom or unsupported microcontroller before? Any tips or resources would be greatly appreciated. Thanks in advance! Is it possible to run PIL in Simulink with a non-supported microcontroller like Infineon TLE9879? simulink pil

Hi, my channel upated time showed current time and date, but data did not appear in channe and last entry was 5 hours ago

Hello, i want to write the power data from my Tasmota IR Device to my channels, but it does not work. I have created 3 channels and i use the correct write API in the script. I use the following script: >D >B =>sensor53 r >S if upsecs%20==0 then =>WebSend [api.thingspeak.com] /update.json? api_key=SZFFJSLVS0SFJ6FL&field1=%sml[1]%&field2=%sml[2]%&field3=%sml[3]% endif >M 1 +1,3,s,0,9600, 1,77070100010800ff@1000,Total consumption,kWh,total_in,2 1,77070100020800ff@1000,Total feed-in,kWh,total_out,2 1,77070100100700ff@1,Power,W,power_curr,0 # I get the messages in the console that the data was send but my channels stay empty. What do i miss ? Thanks for help Writing to ThingSpeak channels with Tasmota IR Power Reader try hard coding a value in this line WebSend [api.thingspeak.com] /update.json? api_key=xxxxxxxxxxxxxxxx&field1=%sml[1]%&field2=%sml[2]%&field3=%sml[3]% like this WebSend [api.thingspeak.com] /update.json? api_key=xxxxxxxxxxxxxxxx&field1=10 then after you have confirmed that, you can test to be sure the numbers from the power meter are being printed right. Also test writing to your channel via the browser address window just to be sure you have the syntax correct. You cen get the format from the API keys tab of you channel, on the right hand side, I do have the same issue ;( Hardcoding values from the browser work in the following format: https://api.thingspeak.com/update?api_key=xxxxxxxxxxxxxxxx&field1=4104.08&field2=401.95&field3=350.00 My tasmota device sends the following corresponding data: 22:39:33.360 SCR: performs "WebSend [api.thingspeak.com] /update.json? api_key=xxxxxxxxxxxxxxxx&field1=4104.08&field2=401.95&field3=350.00" What do i miss in the my script? Hi, I run in the same error. In my case ist was a blank ( ) after the update.json? in front of the api-key. I saw that in a capture and also in the tamota-console 00:33:39.242 SCR: performs "WebSend [api.thingspeak.com] /update.json? api_key=key&field1=7.05&field2=88.18" ==> WebSend [api.thingspeak.com] /update.json? api_key I delete the blank in the script and now it works. regards Niels tasmota script channel writing

I'm using an ESP32 to collect data from an MPU6050 sensor. The ESP32 buffers 170 samples at a time and uploads them to ThingSpeak using the bulk update API. However, the data entries received on ThingSpeak are inconsistent. Here's the pattern of total entries I see on the channel after each upload: After 1st upload: 170 entries (correct) After 2nd upload: 338 entries (should be 340) After 3rd upload: 499 entries (should be 510) After 4th upload: 657 entries (should be 680) After 5th upload: 818 entries (should be 850) As you can see, the expected total should increase by 170 each time, but it's losing a few samples in each batch, and the number of missing entries increases over time. The losses are not consistent — it seems like 1 or 2 samples get dropped randomly in each interval. Some things I’ve considered: The ESP32 is collecting and sending the full buffer (verified via serial debug). Could it be a payload size limit, HTTP timeout, or formatting issue? Maybe ThingSpeak is silently dropping malformed lines from the bulk update? Has anyone else run into this with buffered uploads to ThingSpeak? Any tips for debugging the exact cause of dropped samples? Thanks for any help!

how to post matlab output to a website by not using thingspeak?

Bom dia se alguém puder me ajudar, meu código abaixo, não estou conseguintdo conectar o meu Esp8266 ao ThingSpeak, o erro tá na conexão. Estou usando o MicroPython e NodeMCU na plataforma Pytohn o sistema operacional Ubuntu 20 # DHT11 -> ESP8266/ESP32 # 1(Vcc) -> 3v3 # 2(Data) -> GPIO12 # 4(Gnd) -> Gnd import time, network, machine from dht import DHT11 from machine import Pin from umqtt.simple import MQTTClient print("Iniciando...") dht = DHT11(Pin(12, Pin.IN, Pin.PULL_UP)) estacao = network.WLAN(network.STA_IF) estacao.active(True) estacao.connect('xxxxxxx', 'xxxxxxxxx') while estacao.isconnected() == False: machine.idle() print('Conexao realizada.') print(estacao.ifconfig()) SERVIDOR = "mqtt.thingspeak.com" CHANNEL_ID = "XXXXXXXXXXXXXXXXX" WRITE_API_KEY = "XXXXXXXXXXXXXXXXXXXXX" topico = "channels/" + CHANNEL_ID + "/publish/" + WRITE_API_KEY cliente = MQTTClient("umqtt_client", SERVIDOR) try: while True: dht.measure() temp = dht.temperature() umid = dht.humidity() print('Temperatura: %3.1f °C' %temp) print('Umidade: %3.1f %%' %umid) conteudo = "field1=" + str(temp) + "&field2=" + str(umid) print ('Conectando a ThingSpeak...') cliente.connect() cliente.publish(topico, conteudo) cliente.disconnect() print ('Envio realizado.') time.sleep(600.0) except KeyboardInterrupt: estacao.disconnect() estacao.active(False) print("Fim.") ***************************************************************************************************** No shell aparece como resposta: MPY: soft reboot Iniciando... Conexao realizada. ('192.168.0.23', '255.255.255.0', '192.168.0.1', '8.8.8.8') Temperatura: 29.0 °C Umidade: 63.0 % Conectando a ThingSpeak... Traceback (most recent call last): File "<stdin>", line 38, in <module> File "umqtt/simple.py", line 67, in connect OSError: -2 linha 38 é cliente.connect() Erro ao conectar: cliente.connect() It appears you're connecting to an incorrect server, mqtt.thingspeak.com instead of mqtt3.thingspeak.com. Start by modifying this example. python ubuntu

Hi, I tried to delete a channel data using POSTMAN as described here https://www.mathworks.com/help/thingspeak/clearchannel.html in Examples section: Use POSTMAN to Clear Channel The channel ID is correct, the write API key is correct, and the answer of postman after sending request is: { "status": "401", "error": { "error_code": "error_auth_required", "message": "Authorization Required", "details": "Please provide proper authentication details." } } I already tried to authorize me in Authorization tab using Basic Auth (username and password), but the result is the same. I already tried to use api_key in the request command directly: https://api.thingspeak.com/channels/1234567/feeds.json?api_key=XXXXXXXXXXXXXXXX The result is the same. 🙁 Does this channel deletion method work at all on ThingSpeak?

I want to use Simulink for model-based development of the TC3XX series development board, but I am not sure about the development process and toolchain? Is there a free toolchain available for me to use? Do you have a detailed development tutorial? How to use Simulink for model-based development of TC3XX series development boards infineon；simulink；mbd