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Christopher Stapels


Last seen: ein Tag ago

MathWorks

183 total contributions since 2016

Marketing Manager, ThingSpeak and Mass Market Hardware

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Answered
ThingSpeak Communication Library for Arduino with ESP8266
Those pins would be defined by your board properties, not by the ThingSpeak library. It seems that the standard is GPIO1 (TX) a...

2 Tage ago | 0

Answered
Can I list more than 10 private channels?
We are addressing the problem and will release a fix in a future release. As a temporary workaround, add '&per_page=100' to the...

5 Tage ago | 1

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...

13 Tage 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...

16 Tage 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 ...

20 Tage 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...

20 Tage 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...

23 Tage 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 ...

etwa ein Monat 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 ...

etwa ein Monat 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...

etwa ein Monat 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...

etwa 2 Monate 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...

etwa 2 Monate ago | 0

| accepted

Problem


Find the worst traffic yesterday

2 Monate 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 Monate 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 Monate 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...

3 Monate 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...

3 Monate 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...

3 Monate 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 ...

3 Monate 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 Monate 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 Monate 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 Monate 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...

4 Monate ago | 0

Channel


BME Air Quality
Indoor Air Quality monitor

4 Monate 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".

5 Monate 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...

5 Monate 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...

5 Monate 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 Monate 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 Monate 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 Monate ago | 0

| accepted

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