已回答
Function 'webread' not supported for code generation Matlab - ThingSpeak - Raspberry Pi
Rather than use webread, why not use <https://www.mathworks.com/help/supportpkg/raspberrypi/ref/publish-and-subscribe-to-message...

3 years 前 | 0

已解决

Find state names that start with the letter N
Given a list of US states, remove all the states that start with the letter N. If s1 = 'Alabama Montana Nebraska Vermont Ne...

3 years 前

已回答
Can the 4 free channels each simultaneously upload to Thingspeak once every 15sec
Yes. With a free account you may have up to 4 channels updated at up to once every 15s. Note that each update is considered as o...

3 years 前 | 0

| 已接受

已回答
The response for updating a field can sometimes take up to 12 seconds . Too slow
ThingSpeak has an operational metric to respond to requests to update a channel within a few hundred milleseconds of receiving t...

3 years 前 | 1

| 已接受

已回答
How can I tweet regularly with ThingSpeak?
Twitter has limits that prevent you from tweeting the same message repeatedly. The key to using ThingTweet is to tweet a unique ...

3 years 前 | 0

已回答
Thingspeak with MKR1000 example program from Arduino library 2.0.0 sends http error -301
The fact that it is stable with PC USB and unstable when powered by standalone USB suggests that perhaps the standalone USB is n...

3 years 前 | 0

已回答
writing to multiple fields of
Try and log the values to the serial monitor. Do you see different values for each sensor? Also, maybe your code needs to be li...

3 years 前 | 1

| 已接受

已回答
MQTT subscribe retrieves no data back after immediate reply
I just tested the workflow with MQTT.fx and it works fine. Some points to remember: 1) When setting up the connection, set the ...

3 years 前 | 0

已回答
ESP8266 - Write Single Field
You don't have the ThingSpeak library in your list of project dependencies in your PlatformIO.ini file. You need to add the Thin...

3 years 前 | 0

已回答
GSM sends data but cant see them on my channel.
There are no known issues on the server end. You might want to check the connectivity on your end.

3 years 前 | 0

| 已接受

已回答
Apps React ThingSpeak IoT says it has been triggered but my Matlab script does not generate an Alert email
Most likely your MATLAB code is triggering the Alert API too frequently and is getting a HTTP 429 code. Take a look at the docum...

3 years 前 | 0

已回答
Getting -401 error code when using WritingMulitpleFields
What is most likely happening is you are making requests to the server far exceeding your allowed data rate. One out of every 15...

3 years 前 | 1

已回答
ThingSpeak graphs and thingSpeakRead stopped working at 20:08 BST
There are no known issues at this time. Channels are updating correctly. See for example: <https://thingspeak.com/channels/9> ...

3 years 前 | 1

已回答
Only field1 is updating
What is likely happening is that the fields are being updated inidvidually, and faster than once per 15s. What you really want t...

3 years 前 | 0

| 已接受

已回答
pulse rate enable interrupt caused esp timeout
First, unless you have a paid ThingSpeak license, trying to update your channel every 5 seconds is a waste of resources. In fact...

3 years 前 | 0

已回答
Thingspeak.com yelling "getJSON request failed!"
The underlying issue has been fixed. A missing response header from the server caused your browser to not make any XHR requests....

3 years 前 | 0

| 已接受

已回答
Can I track how often and who have viewed the shared channel of mine for a day or a month if I shared my private channels with others on ThingSpeak or ThingView?
There are ways to do this -- specifically, you can set up a MATLAB visualization on the channel that when loaded increments a fi...

3 years 前 | 2

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已回答
Bug in API response, Reading multiple Fields with ESP8266 Arduino Library.
I think looking at the response at one point in time is probably leading you to incorrect conclusions because the channel was up...

3 years 前 | 0

已回答
how can i solve this error appears when I try reading position
Your channel is empty, and you are trying to index into an empty array retrieved from the channel. Try this: data = thingSpeakR...

3 years 前 | 0

已回答
Connect to Sonoff bridge and temperature sensor
This blog entry has good instructions.

3 years 前 | 0

| 已接受

已回答
Sensor data doesn't gets uploaded to thingspeak channel but it show on the serial monitor
If you have not purchased a ThingSpeak license, your maximum update rate is once every 15 seconds. I do not see where you are li...

3 years 前 | 0

已回答
value not getting uploaded
What troubleshooting have you done? Maybe you are updating your channel faster than once every 15 seconds? Share a link to yo...

3 years 前 | 0

已回答
Sending YF-S201 Flow meter data to ThingSpeak cloud
I take it you are using a free ThingSpeak account. This requires you to update the channel less frequently than once every 15s. ...

3 years 前 | 0

已回答
Time one hour less
What is the time zone of your account? You can log in to ThingSpeak and go to the 'My Profile' and see it.

3 years 前 | 0

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频道

Channel controlled by MATLAB Appdesigner

3 years 前

已回答
Gauge widget refresh phenomenon
I suspect this is on account of a slow internet connection. The gauge needs to make a request back to the server to update its v...

3 years 前 | 0

已回答
Read real time data on raspberry PI
Have you looked at the Raspberry Pi Support Package?

3 years 前 | 0

已回答
Read realtime data from ThingSpeak
If you are using MATLAB installed on your computer, you can install the MQTT in MATLAB toolbox, and subscribe to the channel you...

3 years 前 | 1

已回答
Arduino ESP32 stops posting to ThingSpeak after random times (error -301)
Thank you for trying to eliminate some of the potential issues and posting what you've tried before posting. That certainly help...

3 years 前 | 0

已回答
Grafana and Thingspeak API
I have this set up like this and it works: 1) Set up the datasource. In my case, I set up a new JSON API with this URL: https:/...

3 years 前 | 1

| 已接受