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Christopher Stapels


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MathWorks

180 total contributions since 2017

Marketing Manager, ThingSpeak and Mass Market Hardware

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Answered
Controlling an LED with the Pi 4 using ThingSpeak MQTT subscribe.
I havent looked at the python doc for subscribe. Where do you set the client ID? If this is it, you will want to use a differe...

6 days ago | 0

| accepted

Answered
Controlling an LED with the Pi 4 using ThingSpeak MQTT subscribe.
I would look at the MQTT troubleshooting page for subscribe. It is possible that you have settings in your client that the Thin...

9 days ago | 0

Answered
Thingspeak broker address not working
The mqtt broker gives really limited messages. If you had parts of the format wrong for the subscribe method, it will probably ...

13 days ago | 0

| accepted

Answered
Thingspeak broker address not working
It is working great across all of my many channels, I did not see a break near the time you posted this. What command did you t...

13 days ago | 0

Answered
API - Inconsistency with Curl, when downloading a .csv of my channel
You can get all the correct API calls from the Read data section of the documentation. The API limits you to only 8000 points of...

16 days ago | 0

Answered
ThingSpeak : Read & Write Multiple Field
Can you describe the data flow a bit more? "in MATLAB Simulink via ThingSpeak Cloud from MIT APP Inventer Application " What ...

1 month ago | 1

Answered
PID in ThingSpeak code
I'd suggest you have a look at the MATLAB onramp. Its a two hour introduction to MATLAB fundamentals, I think you would find it ...

1 month ago | 0

Answered
Can't get thingSpeak to display data
You are sending the string value "ctcurrent" to ThingSpeak, in your querry string parameters (not the value of the variable). Y...

1 month ago | 0

| accepted

Answered
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...

2 months ago | 0

| accepted

Answered
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...

2 months ago | 0

| accepted

Problem


Find the worst traffic yesterday

2 months ago | 1 | 8 solvers

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...

2 months ago

Answered
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...

2 months ago | 0

Answered
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...

2 months ago | 0

Answered
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...

2 months ago | 0

Answered
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...

2 months ago | 1

Answered
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 ...

2 months ago | 0

Answered
ThingSpeak Channel Table Error
I suggest using a timetable. The uitable element is really not right for ThingSpeak. dataTimeTable = ... thingSpeakRead(c...

3 months ago | 0

| accepted

Answered
ThingSpeak with LoRa32u4
ThingSpeak has an integration with TheThingsNetwork. You can add an integration in a Things Network application that automatica...

3 months ago | 0

Answered
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...

3 months ago | 0

Answered
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...

3 months ago | 0

Channel


BME Air Quality
Indoor Air Quality monitor

4 months ago

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".

4 months 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...

4 months ago

Answered
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...

4 months ago | 0

Answered
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...

5 months ago | 1

| accepted

Answered
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...

5 months ago | 0

Answered
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],...

5 months ago | 0

| accepted

Answered
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...

5 months ago | 1

| accepted

Answered
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 ...

5 months ago | 0

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