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Hi,
I managed to get Thingspeak JSON data from my channel. However, I would like to know if theres any way to convert Thingspeak's JSON string data to decimal. I would really appreciate it if anyone could tell me how to convert it to decimal.
Currently, this is my JSON: { "created_at": "2020-10-08T09:24:00.0000000Z", "entry_id": 1, "field1": "0", "field2": "12", "field3": "1", "field4": "1", "field5": "1", "field6": "1" }
May I know if it is as simple as deleting the ""? For eg,
{ "created_at": "2020-10-08T09:24:00.0000000Z", "entry_id": 1, "field1": 0, "field2": 12, "field3": 1, "field4": 1, "field5": 1, "field6": 1 }
Hello, I want to create a sort of an alert to display the temperature health like in the image below:
i have found this code:
% This script uses the Air Quality Index (AQI) calculated
% in "particulateConcentration" to display the appropriate text associated
% with the index.
% Copyright 2019 The MathWorks, Inc.
readChannelID = yourChannelID;
% TODO - Replace the [] with the Field ID to read data from:
fieldID1 = 1;
% Channel Read API Key
% If your channel is private, then enter the read API
% Key between the '' below:
readAPIKey = yourChannelReadKey;
returnAQI = thingSpeakRead(readChannelID, 'Field', fieldID1,'ReadKey', readAPIKey);
[airCondition, conditionIdx] = returnairhealth(returnAQI);
plotairhealth(airCondition, conditionIdx)
%% Plot Air Health
function plotairhealth(airCondition, conditionIdx)
vertices = [0 0; 1 0; 1 1; 0 1];
faces = [1 2 3 4];
% Use Look Up Table and air health condition to get color for reading
faceColorPatchLUT = [0 0.83 0; 0.44 0.95 0.52; 1 0.98 0.53; 0.95 0.98 0.22; 1 0.39 0.39; 1 0 0];
faceColorPatch = faceColorPatchLUT(conditionIdx,:);
airHealthPatch = patch('Faces',faces,'Vertices',vertices,'FaceColor',faceColorPatch);
hold on
text(0.5,0.5,airCondition,'FontSize',16,'HorizontalAlignment','center')
hold off
% Remove Axis handle
axHandle = airHealthPatch.Parent;
axHandle.YTickLabel = [];
axHandle.XTickLabel = [];
end
%% Air Health Condition
function [airCondition,conditionIdx] = returnairhealth(returnAQI)
airCondition = {'Good';'Moderate';'Unhealthy for Sensitive Groups';'Unhealthy';'Very Unhealthy';'Hazardous'};
aqiLow = [0;51;101;151;201;301];
aqiHigh = [50;100;150;200;300;500];
lutAQI = table(airCondition,aqiLow,aqiHigh,'VariableNames',{'Air_Health','AQI_low','AQI_high'});
conditionIdx = find(returnAQI >= lutAQI.AQI_low & returnAQI <= lutAQI.AQI_high);
airCondition = string(lutAQI.Air_Health(conditionIdx));
end
However, i don't know howto adapt it to my case where i have only 2 cases : if my variable = 0 : the health is good and the color of the box is green else if my viariable = 1 ==> healt is dangerous and the color is red.
Hello, I'm new to thingspeak, i want to combine 4 fields in one chart, i have used the code below
readChannelID = 1408944; % YOUR CHANNEL NUMBER fieldID1 = 1; % YOUR FIELD NUMBER ie 1 to 8 fieldID2 = 3; % my case 1 Temp 2 Humid readAPIKey = '19EJIJW6YBM7VS7N'; [data1, time1] = thingSpeakRead(readChannelID, 'Field',fieldID1,'NumDays',1,'ReadKey', readAPIKey); [data2,time2] = thingSpeakRead(readChannelID, 'Field',fieldID2,'NumDays',1,'ReadKey', readAPIKey); thingSpeakPlotYY(time1, data1, time2, data2,... 'YGrid1','on','YLabel1','% H.R.',... 'YLabel2','*C','XLabel','Fecha y hora',... 'Title','Tempix y Humix ultimas 24 horas');
However, an error occurs saying that the function thingSpeakPlotYY is unrecognized
There is exactly the same tutorial for my topic but I couldn't make it work. It worked like a charm on SMS service but it wasn't on call. Authentication shouldn't be a problem cause it's similar to SMS configuration. The remaining information that I've doubt is the "Body" part. I filled it like:
From={+Twilio number}&To={+myNumber}&Body=CO2 concentration is exceeding the threshold value and being at :%%channel_1372010_field_3%%
And also, the API URL is:
https://api.twilio.com/2010-04-01/Accounts/{My AuthSID}/Calls.json
I replaced my own information on the above items but It didn't make a call at all even when the TimeControl app run it. Hope to get your help.
Prof. Ayse Tekes shares her story on teaching labs remotely with Simscape:
Check out the following webinar by Prof. Rick Hill to learn how you can use the new interactive Live Script Control Tutorials for MATLAB and Simulink for your teaching! Examples demonstrate interactive control design with Bode plots, Nyquist diagrams, engaging animations, and much more.
Hi,
I am currently having this internship which we are required to send sensor data to Thingspeak as well receiving data of '0' or '1' from Thingspeak to remotely control the LED.
We have done sending of sensor values to Thingspeak and I was able to send data of '0' and '1' ( on and off) to Thingspeak using a software called "Mendix". Our job is to control the LED from a mobile app and a web dashboard by pressing a button which sends the data to Thingspeak I have created. I am using REST call API to send data to thingspeak by using these 2 URLs: https://api.thingspeak.com/update?api_key=UHVD1PPGDS2X&field1=0 or https://api.thingspeak.com/update?api_key=UHVD1PPGDS&field1=1
This is the C++ code we used to send sensor values to Thingspeak:
void setWifiMode(void){ u8 tx[]="AT+CWMODE=3\r\n"; u32 num = strlen((char *) tx); xil_printf((char *) tx); ESP32_SendBuffer(&ESP32, tx, num); usleep(100); receiveData(3); }
void connectWifi(void){ u8 tx[] = "AT+CWJAP=\"eee-iot\",\"hWV4IOcKp0JX\"\r\n";
u32 num = strlen((char *) tx);
xil_printf((char *) tx);
ESP32_SendBuffer(&ESP32, tx, num);
usleep(100);
receiveData(30);
}void establishConnection(void){ u8 tx[] = "AT+CIPSTART=\"TCP\",\"api.thingspeak.com\",80\r\n"; u32 num = strlen((char *) tx); xil_printf((char *) tx); ESP32_SendBuffer(&ESP32, tx, num); receiveData(10); }
void cipsend(float temp, u16 co2, u8 light, float humidity){ u8 command[150]; u8 finalcmd[50]; //field1 Ph field2 Temp field3 co2 field4 humidity field5 light sprintf((char*)command, "GET http://api.thingspeak.com/update?api_key=CE8E8ZJNGZM8&field1=0&field2=%d.%02d&field3=%d&field4=%d.%02d&field5=%d\r\n" ,(int) temp_degc,((int) (temp_degc * 100)) % 100,co2,(int) hum_perrh,((int) (hum_perrh * 100)) % 100,light); u32 length = strlen((char*)command); sprintf((char*)finalcmd, "AT+CIPSEND=%d\r\n", (int)length); u32 cmdlength =strlen((char*)finalcmd); xil_printf("Length %d\r\n", length); xil_printf((char *)finalcmd); ESP32_SendBuffer(&ESP32, finalcmd, cmdlength); sleep(1); xil_printf((char *)command); ESP32_SendBuffer(&ESP32, command, length); receiveData(4); }
We are using a FPGA hardware called Zybo if that helps. I will really appreciate it if anyone could guide us on this as we are just students. My teammate is doing this alone while I am doing the mobile app and web dashboard alone as well and it is quite taxing for us to achieve this without any professional help.
Our difficulty right now is that we are unable to receive data '1' or '0' from Thingspeak to our FPGA hardware, Zybo. We are using Pmod ESP32 for wifi communication and we are currently using C++ language.
The timestamp for the ThingSpeak Alerts I create look like this: "Time: 2021-06-01 06-21-45.001 -04:00" Using a dash (-) instead of a colon (:) between the hour and minutes and minutes and seconds seems very non-standard to me. I've always seen it with a colon.
Is there any way to change the dashes in the time part of the stamp to colons so the above looks like 06:21:45.001? (I presume this is set in "HeaderFields" but don't know how to change it.
Thanks.
Through sensors collect the body vitals and upload it on the cloud and anylsis of that body vitals. How to do analysis
Hello everyone! i'm Chung and i am a student. My major is electrical engineering and I'm learning how to use matlab to load flow analysis. i have a problem with my math problem. It is "matlab code for load flow analysis using newton raphson method". Can you help me write a matlab program that calculates the required problem using the newton-raphson method? I hope to get help from everyone.
Thanks you so much!
Is there a way via MQTT to access the talkback. I want to read the talkback variable using MQTT and not REST. I have a ESP8266 which I am logging data, but also have a relay which I want to switch. I am using MQTT to log the data, but don't wanna use REST to access/read the talkback. Hope there is a way which I missed. Thanks so long.
One of the objectives of lab-based instruction can be to develop students’ familiarity with hardware equipment. When students could no longer come to their lab in person, educators at HTW Dresden developed a MATLAB app using App Designer to replicate the controls on lab equipment such as a signal generator and oscilloscope. Read this article to learn more about how Dr. Henker and Dr. Kelber virtualized their electrical engineering labs.
If you use Simulink or Simscape models for your virtual labs, you can create an interactive display of controls and displays within your model diagram using blocks from the Dashboard library. To do so, connect block parameters to control blocks (knobs, buttons, and switches) and signals to displays blocks (scopes and gauges).
New customizable Knob, Vertical Slider, and Horizontal Slider blocks introduced in R2021a let you choose your own background image, foreground image, handle or slider image, and scale appearance. By combining these with custom gauge blocks, you can create intuitive and photo-realistic dashboards for interacting with your models, such as in the image below.
View examples of controlling simulations with interactive displays, or read some more Tips for Moving your Lab-based Classes Online.
Hello everyone. Yesterday i started my project and now im trying to export data files (CSV) but it is empty. It cointains just the headers and last read (i think). Anyone knows what is happening?
Example CSV exported created_at,entry_id,field1,field2,field3,latitude,longitude,elevation,status 2021-05-26 19:39:23 -03,1,25.00,"43.00
",,,,, 2021-05-26 19:39:39 -03,2,24.80,40.00"
I am trying to simulate the PMSM in fault mode with phase loss at 0.25 sec, but the simulation results are incorrect. For example, the rotor speed changes too much when a phase is missing. I tried to assemble the model in dq coordinates and abc coordinates on my own, but the results are the same. Who can tell you how to modify the engine model so that the simulation shows the correct results?
ThingSpeak includes an integration with The Things Stack to support collection of data over a long range network. I made a short presentation for this upcoming conference that shows you how to add the ThingSpeak integration to your Things Stack project. The agenda seems to be filled with other useful IoT talks. Here is the information on the conference:
Discover the next-generation #LoRaWAN deployments at The Things Stack Conference. Explore advanced LoRaWAN features, cloud integrations and the next-generation #IoT devices at #TheThingsConference - TheThings Stack Edition, online on 28 May 2021!
Registrations are now open: – ow.ly/I1PZ30mNt0I
#TheThingsConference #TheThingsNetwork #LoRaWAN
If you go and see something you like, please feel free to share in this discussion.
'nanmean' requires one of the following: Financial Toolbox Statistics and Machine Learning Toolbox
Error in Custom (no starter code) 1 (line 15) avghumidity= nanmean(humidity);
how to remove this error?
If you teach ordinary differential equations (ODEs) or use ODEs in your class, a common challenge you may have encountered is helping your students overcome the ‘mathematical intimidation’ of the concepts. You can use the Phase Plane and Slope Field apps, developed and shared by the MathWorks Online Teaching team, to let your students develop a visual intuition of ODEs by qualitative analysis.
These apps capture the functionality of the wildly popular PPlane and DField apps created by John C. Polking in MATLAB between 1995 and 2003. While similar in function to the original apps, the Slope Field and Phase Plane apps have been written entirely from scratch in MATLAB App Designer using modern MATLAB coding practices. This makes the new apps easier to maintain, edit, and use.
Get the apps on GitHub, and visit the MATLAB and Simulink Courseware page for more curriculum resources tailored to multiple disciplines.
Via a particle photon and webhook, i am sending data to THINGSPEAK. The channel indicates entries e.g. 1239 entries but the graphs are empty. Can anyone help me to fix this? Thanks
