Christopher Stapels
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MathWorks
173 total contributions since 2017Marketing Manager, ThingSpeak and Mass Market Hardware
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Thingspeak : From a few days ago, I can't display more than about 38Hrs
What is your update rate for that channel? The maximum number of points you can read in a single plot is 8000. Except in limite...
5 días ago | 0
| accepted
thingspeak - Any way to disable "Transfer-Encoding: chunked"?
Are you sending a very large command to your device? The talkback response should be quite small. We cannot change the encoding...
6 días ago | 0
| accepted
Solved
Cell joiner
You are given a cell array of strings and a string delimiter. You need to produce one string which is composed of each string fr...
13 días ago
Help with basics - cant even copy data to another field
Timestamps in a channel must be uniqiue. Once written, you cannot edit a feed. A feed is the collection of a timestamp and t...
20 días ago | 0
Writing Multiple Fields with My API Key and DHT11
Do you need the Uno to take your data? I would reccomend directly programming the ESP to conenct and write to thringspeak (usin...
27 días ago | 0
How can I delete channels in Thingspeak Webside if i do not need them anymore, some channels for testinh made.
Click on the channel settings tab Scroll to the bottm and you will see choices to clear and delecte the channel. Clear will r...
alrededor de 1 mes ago | 0
ESP8266 help -- serial port data is showing data from sensor. Thinkspeak only receiving lines of zero data points.
I reccomend the ThingSpeak library for Arduino. You can use it to program an ESP 8266. You will likely get better error mesages...
alrededor de 1 mes ago | 1
How to upload an array of numbers to a single field in Thingspeak?
Here is one possibility. thingSpeakWrite(958725, 'Fields', 1, 'Values', join(string(x)), 'WriteKey', writeKey) or y = "[ 1 2 ...
alrededor de 1 mes ago | 0
ThingSpeak Channel Table Error
I suggest using a timetable. The uitable element is really not right for ThingSpeak. dataTimeTable = ... thingSpeakRead(c...
alrededor de 1 mes ago | 0
| accepted
ThingSpeak with LoRa32u4
ThingSpeak has an integration with TheThingsNetwork. You can add an integration in a Things Network application that automatica...
alrededor de 2 meses ago | 0
Thingspeak http error 400 for fpga
Can you modify the length to include the line endings? This has been a problem for me in the past when using AT commands. If a...
alrededor de 2 meses ago | 0
i need to get the last entry of things speak using MIT app inventor and use it to determine if my microcontroller is turned off or not sending data to internet
Does your Arduino send updates at regular intervals? You could read the last two or three data points and compare the time inte...
2 meses ago | 0
Solved
The Hitchhiker's Guide to MATLAB
Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".
3 meses ago
Solved
Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...
3 meses ago
last_entry_id
I suggest that this is not the most viable method. There could be unexpected ways that last_entry_id does not always behave a...
3 meses ago | 0
Change User ID or Delete Thingspeak Account
You can now update your user name. When logged in to your Mathworks account (or logged into ThingSpeak) select My profile under...
3 meses ago | 1
| accepted
last_entry_id
Can you describe why you need the last_entry_id? It is not recommended to be used for the reasons you mention (rollover, finite...
3 meses ago | 0
How do I create a bar chart?
Use ThingSpeakRead to get your data, i reccomend a timetable: channelID=12397; data = thingSpeakRead(channelID,'Fields',[1,4],...
3 meses ago | 0
| accepted
First implementation of ThingSpeak, not every write is registered, pls look at my code
The free license is limited to one update per 15 seconds in a given channel. If you are updating different fields in the same c...
3 meses ago | 1
| accepted
thing speak site not taking the values from the web site
It looks like you are using ThingHTTP. The website may have changed, or there may be parts of it that have dynamic content. If ...
3 meses ago | 0
Solved
Missing five
Convert decimal numbers to a base-9 notation missing the digit *5* <<http://www.alfnie.com/software/missing5.jpg>> Too man...
3 meses ago
Solved
Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...
3 meses ago
Read database from cloud-storage (dropbox or onedrive) to Thingspeak
I used dropbox for the image on this channel. Here is the MATLAB visualization code. If you are using Dropbox, the key part i...
4 meses ago | 0
Display the result of Matlab workspace in Thingspeak
You can use the MATLAB visualizations app to generate this visualization. Write your data to two consecutive fields in a channe...
4 meses ago | 0
error connecting to the server MQTT
Are you cereating a unique user name, or using the same one every time?
5 meses ago | 0
Configure header and connection address.
The headers and connection address seem correct. I might take the ZZ out of "content-type". You can see more information at th...
5 meses ago | 0
ThingSpeak Data Analysis answer is always NaN
If there is no data in the last 120 minutes, this will return empty, and make the average NaN. humidity = thingSpeakRead(readCh...
7 meses ago | 1
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