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Please can I run my MATLAB code on the cloud? The code involves calling the fuzzy logic toolbox for irrigation control and also collecting sensor data from farm.
Using the gauge widget works good, and the current value shows up below the gauge. But I've seen articles where the value is shown inside the gauge, not below it. It that possible to do? If so, how?
I do really like the ability of applying colors to ranges of the gauge's values. I'm plotting Air Quality AQI numbers and this works really well for that.
Thanks,
Rick
I am a new user to ThingSpeak. Generally things are going well. I've been able to create channels and use widgets. I am embedding charts into my own web site (using Google Sites) and that is working fine.
My question has to do with labels that I put on the charts in the 'public view'. I can change the title and the X and Y axis text and this shows up as I want. But when I click on the 'export URL' button and a new tab opens up with the chart, the title and X & Y labels are not what I put in (and yes, I did 'save' after changing them). Is this a bug, or is there some other thing I need to do here?
Thanks,
Rick
Im posting data every 10 minutes to this field as you can see, yet when i pull the data back down there are 2 timestamps in between each post with 'nothing' in them which in tern screws up any matlab script trying to average the data. Why is this happening? thanks see below
created_at,entry_id,field2 2021-08-21 09:54:27 -0600,38811,5.416666666666667 2021-08-21 09:57:02 -0600,38812, 2021-08-21 10:03:59 -0600,38813, 2021-08-21 10:04:27 -0600,38814,5.0 2021-08-21 10:07:02 -0600,38815, 2021-08-21 10:13:59 -0600,38816, 2021-08-21 10:14:28 -0600,38817,5.0 2021-08-21 10:17:03 -0600,38818, 2021-08-21 10:23:59 -0600,38819, 2021-08-21 10:24:28 -0600,38820,5.416666666666667 2021-08-21 10:27:03 -0600,38821, 2021-08-21 10:34:00 -0600,38822, 2021-08-21 10:34:29 -0600,38823,8.333333333333334 2021-08-21 10:37:04 -0600,38824, 2021-08-21 10:44:00 -0600,38825, 2021-08-21 10:44:29 -0600,38826,6.25 2021-08-21 10:47:09 -0600,38827, 2021-08-21 10:54:01 -0600,38828, 2021-08-21 10:54:30 -0600,38829,6.666666666666667 2021-08-21 10:57:10 -0600,38830, 2021-08-21 11:04:01 -0600,38831, 2021-08-21 11:04:34 -0600,38832,7.083333333333334 2021-08-21 11:07:10 -0600,38833, 2021-08-21 11:14:01 -0600,38834, 2021-08-21 11:14:35 -0600,38835,9.583333333333334 2021-08-21 11:17:11 -0600,38836, 2021-08-21 11:24:02 -0600,38837, 2021-08-21 11:24:35 -0600,38838,7.083333333333334
Educators use MATLAB Grader to automatically grade MATLAB code, to provide feedback to their students and to scale assessments for large lectures. If you use MATLAB Grader in our browser-based environment at grader.mathworks.com you can view various individual and aggregate student performance analytics. You can export the MATLAB Grader Assignment Report to analyze your student’s performance in more detail:
To make things easy for you, we provide a utility to create customizable assignment reports from the MATLAB Grader Assignment Report. With this utility you can quickly make lists of students with a metric that defines how well they solved the problems within the assignment. You can explore the number of problems each student solved correctly, calculate the mean percentage score they received for the problems or specify points per problem and calculate the points they scored on the assignment.
Please download the utility Customizable Assignment Report for MATLAB Grader from File Exchange. If you are new to MATLAB Grader, watch the MATLAB Grader Overview video and try the interactive Teaching with MATLAB online course (Section 6 is about MATLAB Grader).
The ThingSpeak Communication Library for Arduino, ESP8266 and ESP32 enables an Arduino or other compatible hardware to write or read data to or from ThingSpeak, an open data platform for the Internet of Things with MATLAB analytics and visualization.
Link: https://github.com/mathworks/thingspeak-arduino
Installation: In the Arduino IDE, choose Sketch/Include Library/Manage Libraries. Click the ThingSpeak Library from the list, and click the Install button.
Compatible Hardware:
- Arduino/Genuino or compatible using a WiFi Shield
- Arduino/Genuino or compatible using a WiFi Shield 101 (Use the WiFi101 library version 0.13.0 or older.)
- Arduino/Genuino or compatible using an Ethernet Shield
- Arduino/Genuino or compatible using a MKR ETH Shield
- Arduino MKR1000
- Arduino MKR1010
- Arduino VIDOR 4000
- Arduino GSM 14000
- Arduino Uno WiFi Rev2
- Arduino Yún (Rev1 and Rev2)
- ESP8266 programming directly (tested with SparkFun ESP8266 Thing - Dev Board and NodeMCU 1.0 module)
- ESP8266 via AT commands
- ESP32 (tested with SparkFun ESP32 Thing)
Tutorial: https://nothans.com/thingspeak-tutorials/arduino/send-data-to-thingspeak-with-arduino
Hi I got MatLab license for thingspeak. But I am not sure this MatLab is also valid for thingspeak or not? Do i need to buy add-on license for thingspeak?
An earlier tip suggested using MATLAB Drive to share and collaborate with others using MATLAB Online or MATLAB on desktop systems. Starting in MATLAB R2021a, there is yet another advantage of using this approach – the 'matlabdrive' function returns the path to the folder that contains the content of your MATLAB Drive.
After sharing their files, instructors sometimes direct students to navigate to a specified folder or add certain folders to the MATLAB search path. This ensures that MATLAB can discover the scripts, functions, and other files contained within. Since the MATLAB Drive folder may be installed in different locations on each users’ computer, this could not be done programmatically. Unfortunately, students may miss these instructions and encounter errors. The same can happen between peers working in groups.
Add the matlabdrive function in your code to obtain the path of the MATLAB Drive folder. You can then use functions cd and fullfile to navigate directly to that location or a subfolder. With addpath, you can also add these to the MATLAB search path. For example,
>> drivePath = matlabdrive drivePath = 'C:\Users\username\MATLAB Drive'
>> folderPath = fullfile(matlabdrive, ‘myfolder’) folderPath = 'C:\Users\username\MATLAB Drive\myfolder’
>> cd(folderPath) % Change current folder to ‘myfolder’ in MATLAB Drive
You can run matlabdrive from your desktop or from other MATLAB environments such as MATLAB Online. On desktop systems, you must have MATLAB Drive Connector installed. If MATLAB is unable to find the MATLAB Drive folder, matlabdrive returns an error.
Hello, I was asked to help on a local community project to study Air Quality. I have two monitoring stations via PurpleAir. I can see data/ weekly graphs from both these stations. It appears that PurpleAir only holds/displays data for 1 week and it was suggested that ThingSpeak would [a]store historical data [b]able to "graph for longer periods of time". Is this true? Second question. It was only last week that I have heard of PurpleAir and ThingSpeak... is it possible for a Newbie to setup ThingSpeak to be able to visualize the AQI from my two monitors?
Hello, i use thingspeak to visualize data, when i use the chart, it works well, when i use numeric display, it show NaN.
How can i fix it?
The mouse pointer can't convert into cross cursor when I attempted to open an image processing window so that I can't draw a line on the image.
I recently found some interesting hardware in a demo on Hackster. The Magicbit is an ESP32-based project platform. It includes some plug and play sensors and a built-in display on a brightly colored PCB. The demo shows how to send the data collected by the Magicbit to ThingSpeak. You can see how to use the Arduino IDE to program the device, using the ThingSpeak library for Arduino, ESP 8266, and ESP32 . Of course, once you get the data into ThingSpeak, you can use the integrated MATLAB to do just about anything with the data. The Magicbit is funded from a Kickstarter campaign .
The Symbolic Math Toolbox includes functions for solving, visualizing, and manipulating symbolic math equations. In combination with MATLAB’s Live Editor, it provides an easy, intuitive, and complete environment to interactively learn and teach algebra, calculus, and ordinary differential equations.
Starting with MATLAB R2021a, you can represent matrices and vectors in compact matrix notation with a new symbolic matrix variable data type. This enables a concise typeset display and show mathematical formulas with more clarity. Using them, you can show matrix- and vector-based expressions the way they are displayed in textbooks.
Contrast the visual difference between matrices of symbolic scalar variables and the new symbolic matrix variables:
The syms and symmatrix functions create symbolic matrix variables. To convert a symbolic matrix variable to an array of symbolic scalar variables, use symmatrix2sym. For an example, see Create Symbolic Matrix Variables.
Hi all,
I have created 2 fields in thingspeak, one which displays all datapoints and one which shows the daily average. In the thingview app, both graphs show all datapoints, not the average.
My simulink program require a feedback loop from an AC signal. How does one create a mean/ median value from a sinusoidal signal. Specifically, I want to average a power signal for last 0.1 sec and then adjust PWM signal.
Hello,
Opening TalkBack in Firefox and trying to Add a new command, the green button doing nothing. If I refresh the page, it works fine. First time have a issue - not work... Edge is working from the first time.
Buenas tardes. A ver tengo un problema que no se cómo solucionar. Tengo una estación méteo (Arduino) conectada a ThingSpeak y lo cierto es que funciona perfectamente, pero en los gráficos, tanto en el canal privado cómo en el público, me aparecen varias lecturas en una sola hora:
Como se puede observar, es muy mala cosa que en una sola hora aparezcan cuatro datos, algunas veces muy diferentes, ya que en una hora los valores reales pueden cambiar, con lo cual, no puedo hacerme una idea delas variaciones en 60 minutos. Esto ocurre con los datos de temperatura, humedad, presión y resto de gráficos.
Lo que quisiera conseguir, és que solo apareciera un solo dato por cada hora, durante las 24h del día. Es posible que únicamente imprima un punto y un dato a una sola hora en el gráfico? Cómo lo hago? Donde trasteo? Y con qué parámetros?
Agradeceré cualquier ayuda que me permita solucionar este tema.
Gracias por la atención y la ayuda.
Salu2 cordiales.
Thingsspeak : How to add multiple graphs in single field Ex: Real time monitoring 30 machines temperature in single graph (filed1)
Hi, i wonder if any one experiencing the same, but in my thing sepak profiel i can only see : 1- User API Key 2- Alert API Key
but no MQTT API key? not sure why Thank you
Hi,
I get 200 after a Python post to a channel like this from my Python script:
Ambient light: 13.3 lux Mass is 943.6 g 10:37 that is today, 7/24/2021 Pacific time <Response [200]
Yet the data is not showing up in the widget after 03:07 today and when I export the data it agrees with that:
2021-07-24 02:57:17 MDT 4123 947.4597598 0.833333333
2021-07-24 03:07:18 MDT 4124 947.5867868 0.833333333
here is a code snippet: note it posts every 10 minutes
-----------
request_headers = {'Content-Type':'application/json'}
try:
response = requests.post('http://api.thingspeak.com/update?api_key=' + API_KEY,
json=planta_json, headers=request_headers)
print(response)
except:
print("did not post for some reason")
------------
i never get a "did not post for some reason" debug message from the Python script. its like the data just disappears for some reason.
is there something else in the response i should look at to see why this happens? it will work fine for days then do this.
thanks
