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Christopher Stapels


MathWorks

81 total contributions since 2017

ThingSpeak Documentation Writer
and LCH enthusiast

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Answered
mqtt via ESP8266 connected but not subscribing
You can have up to three simultaneous MQTT connections with a free license. Thanks for posting that you got it working again.

12 hours ago | 1

Answered
mqtt via ESP8266 connected but not subscribing
The mqtt server should reset the count when your devces disconnect, though there may be a short delay. Are you still having thi...

22 hours ago | 0

| accepted

Answered
ThingSpeak Communications Library - how to read multiple fields with one fetch
Yes its on the enhancement request list, but unfortunately has been for some time. I hope it isnt too much longer.

22 hours ago | 0

Answered
Thingspeak "data export" button not working
If your channel is public, can you share the channel number so someone else can try it? Are you sure there is data in the chann...

22 hours ago | 0

Answered
Getting -310 error on simple MathWorks ThingSpeak get temperature example
I got a -301 error when I didnt have the Ethernet cable plugged in, but now it is working fine on an arduino Uno with ethernet S...

2 days ago | 0

| accepted

Answered
Getting -310 error on simple MathWorks ThingSpeak get temperature example
What hardware you are using? We will try to reproduce the error. EDIT I am sttempting to verify the error with an arduino Uno w...

2 days ago | 0

Answered
Reading from Thingspeak: Daily averages are easy. How do I get a monthly average?
There are built in template codes to help you develop MATLAB code. If you go to the MATLAB analysis or MATLAB Visualizations ap...

3 days ago | 0

Answered
Channel ID doesn't matter during upload data
You are correct. It is better for security reasons to provide both the API key and channel ID. Additionally it makes tracking yo...

4 days ago | 0

| accepted

Answered
How to add a timestamp to body?
Yes this is the expected behavior. As described above, you need to call the thingHTTP with TimeControl or React to use the date...

4 days ago | 0

Answered
How to add a timestamp to body?
What time would you want to see in the response? I would have guessed you want to see the time it was called. It might help fo...

4 days ago | 0

Answered
How to test for thing speak plugin using user input's?
Can you rephrase your question? It does not seem to be clear what you are asking.

5 days ago | 0

Answered
How to add a timestamp to body?
Can you take screen shots of the thingHTTP and TimeControl settings? Make sure you blur out the api keys if you want to keep th...

5 days ago | 0

Answered
How to add a timestamp to body?
You need to trigger the request with a TimeControl or React. I just tested it with a TimeControl, I'm sure I've tested with a R...

5 days ago | 0

Answered
how to export data in time range using thingspeak?
You can see the documentation for the read data API call. There is a dateRange parameter you can use. Just be extra careful a...

9 days ago | 0

Answered
Bulk upload working on arduino. But thingspeak graph update only shows last data entry, unless i refresh the page
ThingSpeak plots on your channel view should update in the interval defined in the plot settings (as fast as 15 seconds I think)...

9 days ago | 0

Answered
How to change state of a message to be true or false in jquery?
Perhaps you could try this jquery forum? Are you trying to chnage the status field in your channel feed? if so have a look at ...

10 days ago | 0

Answered
assign variable for the data read from channel
If you have a time control set for a specific time, that should take care of the running at a specific time. You could probably...

11 days ago | 1

| accepted

Answered
Unable to post to Thingspeak channel
Have you had this account for several years? If so you probably would have recieved am email with instructions about how to ren...

11 days ago | 0

| accepted

Answered
Unable to post to Thingspeak channel
GET https://api.thingspeak.com/update?api_key=KYY2MERT251RV2OM&field1=111 That would be the format to try if those are truly th...

16 days ago | 0

Channel


datetimetest

18 days ago

Solved


Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

23 days ago

Solved


Return area of square
Side of square=input=a Area=output=b

23 days ago

Solved


Maximum value in a matrix
Find the maximum value in the given matrix. For example, if A = [1 2 3; 4 7 8; 0 9 1]; then the answer is 9.

23 days ago

Solved


Add two numbers
Given a and b, return the sum a+b in c.

23 days ago

Solved


Vector creation
Create a vector using square brackets going from 1 to the given value x in steps on 1. Hint: use increment.

23 days ago

Solved


Doubling elements in a vector
Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] then B = [ 1 1 5 ...

23 days ago

Solved


Create a vector
Create a vector from 0 to n by intervals of 2.

23 days ago

Solved


Flip the vector from right to left
Flip the vector from right to left. Examples x=[1:5], then y=[5 4 3 2 1] x=[1 4 6], then y=[6 4 1]; Request not ...

23 days ago

Solved


Whether the input is vector?
Given the input x, return 1 if x is vector or else 0.

23 days ago

Solved


Find max
Find the maximum value of a given vector or matrix.

23 days ago

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