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Christopher Stapels

MathWorks

Last seen: Today Active since 2017

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Answered
Ethernet shield Arduino 2560
Are you trying to add the visualizations to your own web page? I'd look here: Embed plots on Web pages Embed a Chart Charts ...

5 days ago | 0

Answered
ThingHTTP pulling MarketWatch data stops working during trading hours
In case anyone stubles on this, Ill promote Derek's findings to an answer. During business hours, the xpath for the data change...

7 days ago | 1

Answered
Unable to download from dropbox to ThingSpeak using Matlab code.
I think you are calling the function with no input arguments. You have at least two options. You can call the functionin your...

18 days ago | 0

Answered
How do I make calculations with ThingSpeak fields?
Use the MATLAB analysis app. Write MATLAB code to read your channel data, do the calculation, and write the AQ value to a new c...

21 days ago | 1

Answered
Data not show in thingspeak using sim800l
How about adding Serial.println("<description>") each time you write to the sim card? Then you can make sure everything is bein...

26 days ago | 0

Answered
Data not show in thingspeak using sim800l
Here is a sim 800l example, that the autor says is working. Can you compare to that one and see what is different? There shoul...

26 days ago | 0

Answered
How should I present multiple point on the map in ThingSpeak Visualization code?
I recommend writing the position data to your channel feed in the latitude and longitude fields. https://api.thingspeak.com/upd...

27 days ago | 0

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Answered
Cannot import data into ThingSpeak due to missing timestamp
There are 8 fields available for measurements. Your file has 13. You can also have elevation, status, longitude, and lattitude, ...

1 month ago | 0

| accepted

Answered
Unable to retrieve data from Thingspeak API (PurpleAir)
Thank you for noting that the issue you had is resolved. If you are reading multiple channels, please be sure to use a short de...

1 month ago | 0

Answered
Can i compare two channels
You definitely can as long as there is data in your channel. Change the part of the code from days(1) to years(1). your final c...

1 month ago | 0

Answered
How do I create a function finding Surface Area, Volume, and Density of a cone?
Looks like the OP had it right, but Im adding the formula back here for completeness. function [SA,V,D] = coneProperties(r,m,h)...

1 month ago | 0

Solved


Quote Doubler
Given a string s1, find all occurrences of the single quote character and replace them with two occurrences of the single quote ...

1 month ago

Answered
How to read data from ThingSpeak private channel field1 by Arduino Uno and ESP8266?
Have a look at the ThingSpeak Library for Arduino.

2 months ago | 1

Answered
Analytics with Data on Thingspeak
We strognly reccomend the getting started tutorial in the help documentation and this new video series, Iot from Data to Actio...

2 months ago | 0

| accepted

Answered
Sending data to ThingSpeak without data
You can use an ethernet connection, or LoRa (Long Range wireless) through The Things Network and the ThingSpeak integration ther...

2 months ago | 0

Answered
I want to send mobile messages from Arduino and ThingSpeak
If you have email on your phone, you can use theThingSpeak alerts service to trigger emails from the Arduino and from other conn...

2 months ago | 0

Answered
minimum and maximum date
If you click the pencil icon on the top of a field chart, you can choose the number of points or number of days to display. The...

2 months ago | 0

Answered
Thingspeak ESPHome configuration error
Your topic syntax is incorrect. The syntax has changed from the previous MQTT broker. Have a look at the MQTT publish to a fee...

2 months ago | 0

Answered
Iam Getting error ^~~~~~~~ exit status 1 call of overloaded 'setField(int, uint16_t&)' is ambiguousn while compiling code to Arduino Uno wifi rev 2
Can you cast it to a string or float before setting the field? I know this will require more memory. perhaps like this: Thing...

2 months ago | 0

Answered
How can i analyze thingspeak data in Power BI
Here is a demo showing how to read data from a REST call. Then you can use the Read data API call. I havent tried that demo mys...

2 months ago | 0

Answered
ESP32 - Arduino - no data seen on Thingspeak
We sent many messages to MQTT users, but since you only signed up recently, you might not have gotten those emails. I apologize ...

2 months ago | 0

Solved


Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

3 months ago

Solved


The Piggy Bank Problem
Given a cylindrical piggy bank with radius g and height y, return the bank's volume. [ g is first input argument.] Bonus though...

3 months ago

Answered
Thingspeak control LED with Arduino
Use the ThingSpeak library for Arduino and ESP. There are some great examples there to help you complete the read task.

3 months ago | 0

Answered
Not able to connect to the mqtt service.
I'm glad to hear that correcting the client ID solved the issue for you. The newer process might be slightly more complex than b...

3 months ago | 0

| accepted

Solved


First non-zero element in each column
For a given matrix, calculate the index of the first non-zero element in each column. Assuming a column with all elements zero i...

3 months ago

Solved


Find the Oldest Person in a Room
Given two input vectors: * |name| - user last names * |age| - corresponding age of the person Return the name of the ol...

3 months ago

Solved


We love vectorized solutions. Problem 1 : remove the row average.
Given a 2-d matrix, remove the row average from each row. Your solution MUST be vectorized. The solution will be tested for ac...

3 months ago

Solved


Matlab Basics - Absolute Value
Write a script that returns the absolute value of the elements in x e.g. x = [-1 -2 -3 -4] --> y = [1 2 3 4]

3 months ago

Solved


square root
Find the square root (y) of an input (x).

3 months ago

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