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Christopher Stapels

MathWorks

Last seen: Today Active since 2017

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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...

environ 14 heures 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...

environ 19 heures 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)...

environ 20 heures 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 ...

3 jours 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.

11 jours 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...

14 jours 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...

16 jours 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...

16 jours 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...

17 jours 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...

18 jours 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...

23 jours 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...

30 jours 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 ...

environ un mois 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...

environ un mois 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...

environ un mois 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.

environ 2 mois 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...

environ 2 mois 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...

environ 2 mois 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...

environ 2 mois 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...

environ 2 mois 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]

environ 2 mois ago

Solved


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

environ 2 mois ago

Solved


Is it a number?
Determine if input is numeric. If it is,output is 1; if it is not, output is 0.

environ 2 mois ago

Solved


Basic commands - Least common multiple
Make a function which will return least common multiple of "a" and "b" Example: a=8; b=6; y=24;

environ 2 mois ago

Solved


Find the complement of a number in binary
Input x is a decimal number and output y is the complement of binary representation of x. For example, x = 10 has the binary ...

2 mois ago

Answered
How to add data to field with thingHTTP
You can use MATLAB analysis code to add the value to your channel. Use webread() or webwrite() to get the data from the externa...

2 mois ago | 1

| accepted

Answered
'React' still sending email after deletion
The emails may have been queued up and not delivered by your client right away.. You can use the get alerts history API to see ...

2 mois ago | 0

Answered
Raspberry Pi Pico - Using Thingspeak with SIM800L
This example is for Arduino, but you make be able to get the commands from that demo. Ive seen a lot of Sim800 stuff on the wil...

2 mois ago | 0

Answered
I am trying to publish data through desktop MQTT Client, but it's get connected but when I am doing subscribe it says connection lost?
The topic location is a little confusing. Where it says "topic" you need to edit that field.

3 mois ago | 0

| accepted

Answered
Bulk-Update Using ESP8266
You can just define the temperature readings as variables, but making them in an array will make it easier to write them to the ...

3 mois ago | 0

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