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i am just thinking to make a project on software defined ratio SDR using matlab and its toolboxes but I am UG student in ECE don't know how to start can we have discussion here and want the guidance from the best or good persons in the field of wireless communication
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Hello everyone,
Im trying to simulate an 3-phase inverter, and for analysis of semicondcutor switches cuurent and voltage, I witness some unusal behaviour. I have connected a current sensor to the drain to calculate and visialize drain current, but the waveform is lookibg something like in picture if instaneous overshooting when going form high to low or vice versa, and the magnitude of the overshooting pulse can reach upto 500 Amps.
Kindly, guide me what am i doing here wrong? and one more thing is that I have set the Ids current to be 63Amps for N-channel Mosfet, but the output is 42-44 Amp max, what could be the reason behind it?
Thank you in advance!!
I cannot get any of my charts to be interactive using matlab. I need to be able to zoom into a chart and I cannot get any interactivity. In its purest from shouldnt this allow me to zoom into a chart?
plot(time, data);
% Enable zooming
zoom on;
(free account)
Ich habe das Problem das ich immer nur 1 Tag aufzeichnen kann (siehe Anhang), obwohl ich den Parameter au 15 tage gestellt habe.
Dear Community,
Since few weeks it looks like I have lost the ability to move cards order in the channel view. I used to be able to to so.
I tried with different browser and even on mobile and it does not work anymore. Did missed something ? Is this feature been removed ?
Thanks.
Tengo semanas trabajando con la app y al subir informacion me aparece que la ultima entrada fue hace menos de un minuto pero las gráficas no se actualizan, ya intente abrir la app desde diferentes navegadores,y dispositivos, en modo incognito, desabilitar extenciones y no obtengo resultados.
I am trying t set up a cellular Particle Boron and Sensor to track my well water levels but the data is not showing up in Thingspeak. I have activated and flashed code to the device, created a Particle account, a Thingspeak account (and channel), and a Webhook. Things mostly work as they should and I can even see the data from the sensor in my Particle Console "Events", but nothing seems to arrive in the Thingspeak Channel. I am looking for technical advice.
Graham
Hello,
it's been a couple weeks that the webrowser client seems to have issues for me.
I can't move the chart with my mouse anymore. And the Average option doesn't do anything, it is always displaying all the datapoints.
Same with the type of points, it is stuck on line type whatever I ask.
Also it will not update the page automatically when new points are uploaded, I have to hit F5 to refresh myself.
I can still control the number of days displayed though.
I tried on brave, firefox and edge and it all behaves the same.
Edit : I see that there are already multiple threads referencing some of those issues already. So the moderator can delete the thread if he feels like it is unecessary.
I get the following error message when using a DELETE command.
I am using the correct api_key and channel ID Error Response: { "status": "401", "error": { "error_code": "error_auth_required", "message": "Authorization Required", "details": "Please provide proper authentication details." } }
I just cannot find out what I'm doing wrong. I've used Postman and Curl apps.
Can anyone help?
Ich erinnere mich, dass die Visualisierungsfenster verschoben werden konnten. Das geht nicht mehr? Wer kennt den Trick?
I can't or it's not working anymore to change the position of the widgets on the channel panel.
I tested on Chrome and Firefox.
Expected:
I noticed a couple new replies show up on the recent poll a day or so ago, but since then, the page can't be loaded anymore in any browser I've tried.
Is MathWorks going to spend 5 years starting in 2024 making Python the #1 supported language?
I'm not sure it's authentic information, and am looking forward to a high level of integration with python.
Reference:
I wanted to say that I am thoroughly enjoying my ThingSpeak channels and I often discuss with friends and associates the technical and documentative aspects of the MathWorks/MatLab/ThingSpeak platform and all the possible benefits for engineers, researchers, scientists and students across the globe.
My pubic channel demonstrates to them how useful it is to see simple data in a visually intereresting way. I hope my efforts will bring ThingSpeak more subscribers in the new year.
If there are any questions, let me know. (I owe Christopher a story here about my Alaska system. Soon......)
https://thingspeak.com/channels/2016936 Alaska Boiler System
Opie
edited update, only one channel used publically now in 2025. I still owe CS a story...
Hello Everyone,
I want to model an electric vehicle in simscape electrical, I have few quiries regarding it.
- I have modelled an 3-Phase inverter, and used ee_getPowerLossSumary to get switching losses, and the results are okay as i was expecting, but now is there any other function to calculate conduction losses?
- I want to connect a BLDC motor, I have few parameters from manufacturers datasheet, but not all the parameters, so what would the best way according to your understanding, to model motor losses (Copper + Core).
I'm trying to calculate major fundamental losses of an EV. Looking for your inputs on this.
Thank you!
I am sending data to Thingspeak chanels from an ESP8266. I am saving data on the ESP memory which is collected at 5 minute intervals . I have created a trigger function which sends the data on demand in batches from the memory, which means there could be varying number of Data points from say 10 to 50.However I have notice recently whilst my code tells me the data points have been transmitted not all get recorded in thingspeak, are there restrictions which cause this problem and if so what is the solution please?
Hi, while I can download data from the thingspeak page as csv older than 5 months, I can't read history data older than one month.
The data exists on the database.
This are my requests:
https://api.thingspeak.com/channels/667773/fields/1.json?start=2023-11-23T01:01:10.000Z
The same results. Every day the older value date is higher by one day.
Today the older value day is: 2023-11-25T02:13:46Z
Why? Is there a limit to history data loading?
I have encountered a problem. I want to study the direction of PHEVP2 configuration energy control strategy, but the whole vehicle model has stumped me. I don't know how to proceed, and every time I run, an error message will be reported. I don't understand where the problem lies?
Hello, I have followed the tutorial from https://www.halvorsen.blog/documents/technology/iot/arduino/resources/Arduino%20UNO%20R4%20WiFi%20and%20ThingSpeak.pdf to use an arduino Uno R4 wifi board to write sensor data to thingspeak, and the field 1 of random data is updating properly, but when I try to send data from analog pin A0 it will not update to field 2. I've been speaking with ChatGPT to try to resolve this issue, and it has offered several solutions that have simplified the code dramatically but the same problem persists. I wonder if this could be an error with the channel settings in my thingspeak channel? I cannot find any errors myself. ChatGPT suggested looking for the http responses to trouble shoot and both fields return -210, which it says means the API key is missing, but I have stored this key in the seperate arduino_secrets.h tab in the code, so both fields must be using the same API key, and since field 1 is working properly I don't think this is the issue. This is why I suspect there might be a deeper issue with my channel. I set it up about a year ago with a different experimental project, so maybe it has been corrupted over time. Any help is much appreciated! My current loop code reads as follows:
void loop() {
// Update field 1
float temperature = random(2000, 3000) / 100.0;
Serial.println(temperature);
ThingSpeak.setField(1, temperature);
ThingSpeak.writeFields(SECRET_CH_ID, SECRET_WRITE_APIKEY);
int response = ThingSpeak.writeFields(SECRET_CH_ID, SECRET_WRITE_APIKEY);
Serial.print("ThingSpeak write response code: ");
Serial.println(response);
delay(1000); // Add a delay to separate updates
// Update field 2
float button = analogRead(A0);
int buttonInt = static_cast<int>(button);
Serial.println(buttonInt);
ThingSpeak.setField(2, buttonInt);
ThingSpeak.writeFields(SECRET_CH_ID, SECRET_WRITE_APIKEY);
int response2 = ThingSpeak.writeFields(SECRET_CH_ID, SECRET_WRITE_APIKEY);
Serial.print("ThingSpeak write response code: ");
Serial.println(response2);
delay(19000); // Adjust the delay to maintain the total delay period
}
