Results for

Hello, I run a weather station that consists of several sensors. Sensor1 supplies external weather data, Sensor2 internal room data and Sensor3 particulate matter values.
Can I display the variables of all sensors in a "Weather Station" channel and display them in charts?
If so, how do I do that with ThingSpeak?
Many Thanks
Hi Fellow Users,
I am Muthuserpi From A begginer of Optics studio Please anyone help me how to add two diffeaction reflective grating and How to tilt and decenter in matlab simulation
Thanks And Regards
S.Muthuserpi
Hello Community,
For E vehicle application to control the speed and torque of PMSM motor I am implementing FOC algorithm. We know that to arrive at Speed set point we have speed control loop which is outer loop, Further PI CONTROLLER of speed loop will give reference for Iq current which regulates the current using current loop. My question is 1.How to arrive at Torque set point?
2. Is speed control using FOC is enough or we should implement Torque control algorithm also?
3. should we have speed mode and Torque mode selection in case of constant speed requirement during cruise mode and high torque requirement during uphill situation respectively
4. To arrive at Torque set point what is the relation or transfer function to tune PI controller for Torque loop?
Please give your valuable inputs and answers, thanks in advance
I wanted to ask that can we send bulk data through ThingSpeak ESP32 library using:
POST /channels/266256/bulk_update.csv HTTP/1.1
Host: api.thingspeak.com
Content-Type: application/x-www-form-urlencoded
time_format: relative
I saw it on mathswork "Bulk-Write CSV Data" (link: https://www.mathworks.com/help/thingspeak/bulkwritecsvdata.html)
Does ThingSpeak library supports the capability to send bulk csv data, any guidance?
Thanks and looking forward for your positive reply
I have a data.
And, I want to substract the data using for.
But, I want to ignore the nan values and substract others.
For example, [1, 2, 3, NaN, 6, 9, 12, 14] ---- substract---> [1, 1, 3, 3, 2]
How can I do this?
Hi guys,
I'm very new to matlab, so this might a rookie mistake. However, it seems that I have messed up some important part with the plot function. The program does not give my any kind of error messages, but still does not plot anything. What can I have done wrong and how do I fix this?
Best regards
My code:
close all
for t = -2:0.1:3
if (t<0 || t>1)
xvalue = 0;
end
if (t<= 1 && t>= 0)
xvalue = exp(2*t+1);
end
yvalue = -1*(xvalue) + exp(1);
hold on
figure(1);
plot(t, yvalue);
hold off
end
grid on;
Help us please, we need to send email after measurement from sonde (GSM report) is under limit for three days.
"React" on the limit, is non for three days under limit., and time control is days or weeks runner.
I propose trigger on time control but what is the code?
????
% Read the recent data.
moistureData = thingSpeakRead(channelID,'NumDays',3,'Fields',1); {is that right, that I read last three days measurement (3000x)?}
% Check to make sure the data was read correctly from the channel.
if isempty(moistureData)
alertBody = ' No data read from plant. ';
else
%{need if
% moistureData is for three days under limit from sonde then send
% email}
span = max(moistureData) - min(moistureData);
dryValue = span;
% Get the most recent point in the array of moisture data.
lastValue = moistureData(end);
% Set the outgoing message
if (lastValue<=dryValue)
alertBody = ' I need water! ';
elseif (lastValue>dryValue)
alertBody = ' No water needed. ';
end
really thanks so much
Hi
Sent data was 4.94
{"created_at":"2022-08-28T23:38:23-04:00","entry_id":1269,"field4":"4.94"}]}
Read data was 4.00
Code:
long PHTS = ThingSpeak.readLongField(counterChannelNumber, FieldNumber4, myCounterReadAPIKey);
int statusCode = ThingSpeak.getLastReadStatus();
if (statusCode == 200)
{
Serial.print("ThingSpeak pH: ");
Serial.println(PHTS);
}
How to display 4.94 (actual data) when reading the data.
Thanks
I want to allow private channels to be viewed only by my organisation. How do I do that?
Hello Academia,
I've been trying to get information regarding these configuraitons in a 3 phase transformer. The first is a dual secondary consisting of a wye output and delta output. Both feed separate 3 phase bridges, which outputs are connected in parallel.
The second is a Wye output, which each leg feeds 3 more series windings, which are located on the adjacent core (phase shifted) on the same transformer, with only one 3 phase bridge for the output
I see there is a zigzag simulink but can't seem to get that loaded...
My question is, are these essentially identical in operation, or is the dual secondary what I should be using? (due to better harmonic rejection)
Thanks,
Bryan
Hi,
I am using some dragino sensors and for the testing period I have used TTN and Thingspeak. The TTN to thingspeak integration was straigthforward as there are plenty of guides out there. However, the sensor will be running in an environment where I can not install a gateway and I will have to rely on a private LoRaWAN network. I would still like to use thigspeak as my endpoint for the data, and the company has requested documentation to configure endpoint URL and authorization header. They have no other inputs they can configure.
I am a newbie in all of this and I was wondering if you can point me in rigth direction. Is there any documentation available on how to configure a lowrawan server to send the data to my thingspeak channels? For each of these channels I have a write channel feed link, which I am guessing would be the authorisation header? What should I use for the enpoint URL?
Many thanks.
Ray Berkelmans
Ray Berkelmans
Last activity on 23 Aug 2022

HTTP error code -301

What is going on in ThingSpeak recently? All my ESP's which use the ThingSpeak library have either stopped working or only are only posting data very sporadically. The error code is :"Problem updating channel. HTTP error code -301". I've gone back to the basic example in the ThingSpeak library (unsecured) and it doesn't work either - same error code -301. What has changed?
none
none
Last activity on 18 Aug 2022

Free plan usage during course in IoT

Greetings ThingSpeak team,
Regarding the ThingSpeak Free plan - Is it elligible for usage as a part of academic course free of cost?
I was considering using your platform to demonstrate a few IoT functionalities while teaching an IoT PostGrad course to about 20 students, who would create free accounts during the course. Usability would be restricted within the free plan limitations during class activities.
However, I am unsure if this is allowed under the ToS. Do I require a Matlab license in this case?
Thanks!
shyam
shyam
Last activity on 16 Aug 2022

Issue related graph output

dear sir, We are using IOT builder system and trying to make project on thingspeak we are unable to find graph after run the program in Python after completing whole system and connection properly please resolve issue and aware about problem.
Hi everyone,
I want to know how much time my data takes from uploading it to a thingspeak channel until the channel receives the data. Therefore I am sending a unix timestamp as data to my thingspeak channel. When ThingSpeak receives the datapoint, it creates a timestamp itself called "created_at". But this "created_at" timestamp measures only seconds, while the unix timestamp, that is sent as data, measures milliseconds. Because of this, it can happen, that the unix timestamp in the data is bigger than the "created_at" timestamp from thingspeak, which makes no sense.
Does anybody know if there is a way that the "created_at" timestamp also measure milliseconds? Or if there is a better way to measure the latency between my system and ThingSpeak?
I have an ESP32 that has 5 values (solarW, batteryV, pumpW, pumpRPM and pumpLPM) that I'm writing to 5 fields on a Thingspeak channel.
if ((millis() - fifteenTstart) > 15000){
Serial.println("Updating Thingspeak....");
ThingSpeak.setField(1, solarW);
ThingSpeak.setField(2, batteryV);
ThingSpeak.setField(3, pumpW);
ThingSpeak.setField(4, pumpRPM);
ThingSpeak.setField(5, pumpLPM);
int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
if(x == 200){
Serial.println("Channel update successful.");
}
else{
Serial.println("Problem updating channel. HTTP error code " + String(x));
}
}
It works fine when there's a good connection to the internet and Thingspeak, but there's a 10 second or so delay when Thingspeak is unavailable (WiFi, internet or website non-connectivity).
I would like the code to recognise that there's no ThingSpeak connection musch faster (1 second or less woud be good, but I'll take two!).
Or, if it's possible to just send the data out without the code waiting for a confirmation back (I only need the data to go OUT from the ESP32 to Thingspeak, nothing needs to come back).
The reason for doing this is there's other code on the ESP32 that I need to get back to, having a 10 second delay in the middle of the code ain't good for the pump safety reaction code.