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Hi,
I would like to export data from my channel. My channel receives data every 15 minutes but I would like to export the data similar to what I can see when I change the chart/field's timescale to 60 minutes.
Thanks!
Hello , I wonder how to determine continous or discrete time modelling.For example if I want to run my model in MCU in this case discrete model is suitable?I am a bit confused
Hi everyone,
I have been using Thingspeak for quite some time now for monitoring data for my wife‘s greenhouse. She accesses those data via the public view of the channel. So far, so good.
Now someone has used the „feature“ to add a comment to that view. Nothing serious, but my wife isn‘t happy. Therefore she asked me to remove the comment, and to set things up in such a way that comments can no longer be added.
Thus my two questions: 1. How can I delete the comment? 2. How can I disable comments made by not signed on users?
The channel in question is https://thingspeak.com/channels/971602
With best regards
Volker Bandke
I'm presently working on an Air Quality monitor to be able to check the status of my environment and remote environments on ThingSpeak. I was planning on using the BME680 sensor. Does anyone have any experience with this or other air quality sensors? I'm looking probably for CO2 and the like (Volatile Organics), not so much particle sensors, though a combination may be best.
Hi,
I set at the Chart Options Results on 40320, what should be one week. But the graph shows only 36 hours (and some minutes). I also try to set it results on 7 day, but still I get only 36 hours.
Why it is not showing 7 days graph?
Frank
https://thingspeak.com/channels/1222127
Here's an example of virtualizing a lab course.
MathWorks is please to offer a new training course, Power Electronics Control Design with Simulink and Simscape.
This one-day course focuses on modeling and controlling power electronic systems in the Simulink® environment using Simscape Electrical™. Topics include:
- Modeling direct current (dc) power electronic components
- Controlling the level of fidelity in a model
- Developing controls for power electronics
- Modeling three-phase alternating current (ac) power electronic components
- Controlling power electronics for motor drive applications
Right now ThingSpeak supports up to 8 fields of data plus the status and three position fields. If you could have more fields, how many would you want? I have one channel of control settings for a project that I would have used up to 12, but no more than that.
Did you know you can change your user id? We went through a short time where everyone was auto assigned a long user id with 'mwa' and a bunch of numbers that couldn't be changed. You can now make it something more relevant to your actual IoT persona. Click on your user picture or icon on the upper right. Select 'My Profile' and click the Edit button under username. Share your interesting IoT themed names here.
Hi everyone,
I am a third year BEng Energy Engineering student. I am looking at the design, modelling and peformance of an HVDC power converter for use in offshore wind for my final year dissertation. Power electronics is a new area for me and I am also new to simulink/ simscape elctrical.
Could anyone provide some useful examples of MMC (in particular rectifiers), or some advice for designing in simscape electrical. I am struggling with the design of PWM control especially. I aim to make a scaled down version of the MMC in Simulink but so far have had no luck. If anyone can help I would be really appreciative.
Thanks in advance.
Joe
Hi everybody!I've realized a DC/DC Buck Converter Model with closed loop control system. I need to limit the overshoot in the step response of the submitted system. I've already tried to tune the controller in the PID Tuner by manually adjusting the overshoot by moving the response time slider, as it is said in this article: https://it.mathworks.com/help/slcontrol/gs/automated-tuning-of-simulink-pid-controller-block.html The problem is that it is not accurate. I manage to get an overshoot of 4.77% or 5.4%, whereas i need to set the parameters in order that the overshoot is 5%. Should I use TuningGoal.Overshoot? How am I supposed to do? How should I set the input and output in my model? I've read Matlab documentation but I didn't catch that. Thanks in advance!
I am currently working on simulink online but I cannot maximize the screen
Just making sure people are aware of our new Onramp courses. These are great self-learning resources for students.
Released a few months ago:
Released this month:
Please I would be glad if I could be helped with the design of Microturbine coupled with PMSG.
How do you teach subjects like Programming and Numerical Computing hands-on in these challenging times?
Prof Chiranjoy Chattopadhyay at the Dept of Computer Science and Engineering at IIT Jodhpur shares his innovative approach to teaching at a distance in this new Technical Article on Teaching Parallel Computing Online with MATLAB.
The course utilized MATLAB Online , MATLAB Onramp and MATLAB Grader to train students in the basics of technical computing, in addition to using a Hands-on Online GPU workshop organised with the MathWorks Education Team. As a result of this approach to distance teaching, the students have reported good levels of understanding in the main learning outcomes of this course, as indicated in the survey results (below):
Please consider trying out the links above to check if your course might benefit from a similar approach, and feel free to message us if you are interested in learning more.
I just highlighted an app on File Exchange for emulating an experiment. Great idea for doing lab classes with software. What I like about this app is that it incorporates statistical variance and measurement noise that comes from physical experiments.
Read more about it here:
https://blogs.mathworks.com/pick/2020/11/20/emulating-a-physical-experiment-of-measuring-mms/
Hi everyone, I'm trying to estimate the Frequency Response of a buck converter. I've found this article: https://it.mathworks.com/company/newsletters/articles/estimating-the-frequency-response-of-a-power-electronics-model.html I've adapted the procedure to a buck converter and followed the instructions but something went wrong. In the last step I've performed a time-domain verification in a Simulink® simulation with the switch-mode buck converter and a Transfer Function block implementing the parametric estimation and compare the response of both systems to the same small perturbation signal but the estimated model response doesn't match the switching model response. I don't know why I've got a diverging systems. I've tried to reduce the load and modify the duty cycle but nothing changed. How can I fix it?
In the link below (File Exchange), you'll find an example with an electric motor supplied by a fuel cell stack (Simscape implementation) and a battery. When motor load is low-to-normal, the fuel cell provides excess energy, that is used to recharge the battery. At motor peak load, the battery needs to contribute in order to complete the expected duty. If you have any query or thoughts, please reach me at jsagardu@mathworks.com
https://www.mathworks.com/matlabcentral/fileexchange/59343-fuel-cell-battery-driven-electric-motor-h2-transfer
I would like to plot 2 discrete vectors on one graph created as follows: u=1; X={u,2*u,3*u,4*u,5*u,6*u,7*u,8*u,9*u}; Y={u,3*u,5*u,-u,-6*u,u-u,u^2,u^3,u^4}; stem(X,Y) unfortunately system returns error how to do it properly?
Here's a short article describing how educators from UNSW have used Live Scripts to help students understand mathematical models. Interactive live scripts allow students to experiment and understand concepts through trial and error. The article also explains how the scripts helped provide an enriched online learning experience for the students.
Do you use Live Scripts in your teaching?
