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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...

2 giorni 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...

3 giorni 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)...

3 giorni ago | 0

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

13 giorni 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...

16 giorni 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...

18 giorni 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...

18 giorni 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...

18 giorni 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...

20 giorni 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...

25 giorni 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...

circa un mese 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 ...

circa un mese ago | 0

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.

circa 2 mesi 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...

circa 2 mesi ago | 0

| accepted

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 mesi 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 mesi 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...

3 mesi 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 mesi 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 mesi ago | 0

Answered
Query with time limit to read the field is not working
You can use MATLAB in the free ThingSpeak even if you dont have a seperate MATLAB license. Those two readings have a timestam...

3 mesi ago | 0

Answered
Sending a character string ?
Write the data to the status field (...&status=myStatus... ), and then set 'show status" in your channel settings.

4 mesi ago | 0

Answered
[RESOLVED] How to send data from my Arduino to Thingspeak using a GSM SIM800c ?
Seems like you have made a nice start on your first project! You seem pretty close to the goal. Since you shared the API key, I...

4 mesi ago | 0

| accepted

Answered
Displaying dates instead of minutes in 3 day comparison
The temperature example you used is a way to compare three different ranges of times onthe same plot. You can read the timestam...

4 mesi ago | 0

Answered
Connecting to ThinkSpeak With Esp8266 and FireBeetle board Errors
Why not try the ThingSpeak library for Arduino and ESP and others ? I think its a lot easier than using the AT command set.

4 mesi ago | 0

Answered
How to retrieve data from thingspeak to unity using rest API ?
You can use the Read Data endpoint to get data from ThingSpeak along with UnityWebRequest in Unity. You can also use the MQTT...

5 mesi ago | 0

Answered
Receive Notification when Data not Coming
Yes, this definitely possible. Have a look at the no data check section for the React App help. Also you could write a MATLAB...

5 mesi ago | 0

| accepted

Answered
Can someone help me with this coding? When I run it always says No data read, it should be show the result I write there because it already passed the conditions
I just read your channel and there is no data in the past day. NumDays ,1 privides the data from the last day starting now. Yo...

6 mesi ago | 0

| accepted

Answered
Can someone help me with this coding? When I run it always says No data read, it should be show the result I write there because it already passed the conditions
Channel 1517893 is not public. In this line: temperatureData = thingSpeakRead(channelID,'NumDays',1,'Fields',1); you wil need...

6 mesi ago | 0

Answered
HTTP Post - No data at receiver
Instead of thingHTTP, I would reccomend you use a MATLAB analysis. You can use the webwrite command to create a POST. There is ...

7 mesi ago | 0

Answered
Show value from thingspeak in excel
Here is one example.

8 mesi ago | 1

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