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Christopher Stapels


Last seen: Today

MathWorks

157 total contributions since 2017

Marketing Manager, ThingSpeak and Mass Market Hardware

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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".

1 day 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...

1 day 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...

3 days 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...

10 days 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...

10 days 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],...

11 days 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...

12 days 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 ...

12 days 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...

15 days 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:...

16 days ago

Answered
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...

2 months ago | 0

Answered
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...

2 months ago | 0

Answered
error connecting to the server MQTT
Are you cereating a unique user name, or using the same one every time?

2 months ago | 0

Answered
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...

2 months ago | 0

Answered
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...

4 months ago | 1

Answered
ThingSpeak Google Gauge name does not show UTF-8 coding correctly
The fix is live, please check it out. I have a widget with Scandinavian letters in the title. https://thingspeak.com/channe...

4 months ago | 1

| accepted

Submitted


IoT Data Explorer for ThingSpeak and MATLAB
A MATLAB app to visualize ThingSpeak data. Make time comparisons of your data, retime data, and export data.

4 months ago | 30 downloads |

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Answered
Display in small window
I used appdesigner in MATLAB. I put the following code in the startup function. It updates every 10 seconds. Plus, the window ...

4 months ago | 0

Answered
MATLAB Visualization for Thingspeak
There must have been some confusion on which products require the paid license. In this case, a paid license for ThingSpeak is n...

5 months ago | 0

| accepted

Answered
How to calculate data with price rate for water consumption.
This sounds like a very interesting project. I wonder what sensor you are using to track the water consumption. It sounds like ...

5 months ago | 0

| accepted

Answered
Things speak data upload from sensors at the same time issue
A single update is generally limited to 8 fields, plus locaton and status information. There are a few ways to achieve the effe...

5 months ago | 1

| accepted

Channel


duck pond info
Here is the description

6 months ago

Answered
MQTT subscribe gets no data back
Can you try connecting with another desktop based broker (MATLAB has one) or MQTTFx to make sure you have all the api keys corre...

6 months ago | 0

Answered
How do i send multiple emails to different people using the Thingspeak Matlab Analysis
You can only send emails to your own account, to prevent misuse of the system. You could use a particular code in the email an...

6 months ago | 0

Answered
Save React button disabled when Edit React
We have created a fix for this issue and will release a patch in an upcomming release. In the meantime, the easiest work around...

6 months ago | 0

Answered
Bulk CSV upload to ThingSpeak with Python
When I write write_api_key=xxxxxxxxxxxxxxxx&time_format=absolute&updates=2020-04-03T10:26:23+0100,1.2,2.3,3,4,5,6,7,8,42.0,0.5,...

7 months ago | 1

| accepted

Answered
Bulk CSV upload to ThingSpeak with Python
You put the values from the csv file into the params. so if your csv file says date, field1, field 2, 2020-01-01 12:00:00,10,...

7 months ago | 1

Answered
Bulk CSV upload to ThingSpeak with Python
The documentation page explains where to put the channel ID. The Hackster article you mentioned on the forum is the correct one...

7 months ago | 2

Answered
Can we upload image to Thingspeak?
At present, it is not easy to upload images to ThingSpeak. You could break it up into multiple fields and feeds, but it would r...

7 months ago | 0

| accepted

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