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I would like to know the maximum amount of storage space in the Data Logger.
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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?
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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
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is there any problem today? thanks
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
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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
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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.
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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?
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!
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.
