Results for
Hi, I have this equation for moment-axial force interaction: 0.25*(M/M0)^2 + (N/N0) = 1. This equation produces the following curve. Now, I need to make a change to this equation so that the first term becomes (M/M0)^2, and the second term can be changed while keeping (N/N0). The other side of the equation remains the same. ((M/M0)^2+?? = 1). I need to get the same curve as in the figure.
TimeControl Ran, but it didn't appiied it to channel (chart has not been updated in the right time and in the end, it did not ran, had to manually run the script by myself). And I would like to request to MathWorks to fix (modify) my chart to right time and value and investigate this problem.
I want to control the level my water tank with a esp8266 and Thingspeak.
I can see the level in Thingspeak. This is working.
Now I want to send 2 emails :
- One daily email with the actual level
- Alarm email when level is below a setpoint.
How can I incorporate the value from a channel in the email ?
What I have now for the daily email , but with errors :
alert_body = 'huidig peil regenput';
channelID = ..........;
% Provide the ThingSpeak alerts API key. All alerts API keys start with TAK.
alertApiKey = 'TAK...............';
% Set the address for the HTTTP call
alertUrl="https://api.thingspeak.com/alerts/send";
% webwrite uses weboptions to add required headers. Alerts needs a ThingSpeak-Alerts-API-Key header.
options = weboptions("HeaderFields", ["ThingSpeak-Alerts-API-Key", alertApiKey ]);
% Set the email subject.
alertSubject = sprintf("Niveau regenput " );
% Read the recent data.
peil = thingSpeakRead(channelID,'Fields',1);
% Check to make sure the data was read correctly from the channel.
% Set the outgoing message
webwrite(alertUrl , "body", alertBody, "subject", alertSubject,'Fields',peil);
% Catch errors so the MATLAB code does not disable a TimeControl if it fails
try
webwrite(alertUrl , "body", alert_body, "subject", alertSubject, options);
catch someException
fprintf("Failed to send alert: %s\n", someException.message);
end
The errors I receive :
Unrecognized function or variable 'alert_Body'.
Error in Read Channel to Trigger Email 1 (line 24)
webwrite(alertUrl , "body", alert_Body, "subject", alertSubject,"Fields",peil);
Manny thanks in advance
Hallo,
ich Neuling hier, und habe das Beispiel WriteMultipleFields benutzt um die Funktionsweise zu verstehen.
So weit so gut, hat auch alles grklappt. Jetzt nach 2 Tagen bekomme ich immer eine Fehlermeldung.
Problem updating channel. HTTP error code -401 abwechselnd mit
Channel update successful.
Es ist immernoch die gleiche Software, Board ist WiFi LoRa 32 V3.
Hello everyone,
I am trying simulate a gas turbine system for my course on modelling and optimization of energy system. I have come out with a design consisting of a compressor, air preheater, combustion chamber and gas turbine. When I try to do the modelling in Simulink, I couldnt find something similar to combustion chamber. Does anyone have any experience in doing this?
Orginal Design:
I have also amended it and come out with second design, where I change to combustion chamber to a heater and the exhaust air is recycled back to air compressor, making it a closed loop system. But I am also unable to find heater from the simulink library, the closest i can get is convective heat transfer. Can someone help on this too and if the closed loop system is feasible to model?
Design 2 :
Hi everyone,
for my thesis project I would need to get, every second of the simulation, real-time output data from a Simulink model, without using Simulink Real-Time, as it supports only Speedgoat Hardware. Is there a particular set of blocks for that purpose?
I have to provide that real-time data to hardware for an Hardware in the Loop Simulation so I will need to be able also to receive, as an input, data from the hardware to the Simulink model, again every second of the simulation, to close the loop of the simulation.
Thank you in advance for your support.
Hi! I am using matlab inbuilt plot option( without typing code) to plot the data. This joins the data points using straight line by default. What will be the easiest way to plot if I want curve to join the points instead?
Buongiorno, non mi è possibile connetermi al canale di thingspeak che ho creato, per passare i dati tramite MQTT. Il codice segue la libreria PubSubClient su arduino ide, l'errore restituito dal serial monitor dell'ide é: -4 : MQTT_CONNECTION_TIMEOUT - the server didn't respond within the keepalive time.
Allego il codice per eventuali verifiche:
Grazie per a disponibilità
#include "PubSubClient.h"
#include <ESP8266WiFi.h>
#include "secrets.h"
bool DEBUG = false; // true=serial message of debug enabled
char* server = "mqtt.thingspeak.com";
WiFiClient wifiClient;
PubSubClient client(server, 1883, wifiClient);
String payload;
// BME280 Setting
#include <Wire.h>
#include <Adafruit_BME280.h>
//#define SEALEVELPRESSURE_HPA (1013.25)
Adafruit_BME280 bme; // I2C
bool BMEStatus;
ADC_MODE(ADC_VCC); // Set ADC for read Vcc
// Update time in seconds. Min with Thingspeak is ~20 seconds
const int UPDATE_INTERVAL_SECONDS = 3600; //il clock interno ha un errore del 5% questo valore va tarato sperimentalmente
//const int UPDATE_INTERVAL_SECONDS = 60; // caricamento ogni minuto solo per test
void setup()
{
// Connect BME280 GND TO pin14 OR board's GND
pinMode(14, OUTPUT);
digitalWrite(14, LOW);
Serial.begin(115200);
delay(10);
// BME280 Initialise I2C communication as MASTER
Wire.begin(13, 12); //Wire.begin([SDA], [SCL])
BMEStatus = bme.begin();
if (!BMEStatus)
{
if (DEBUG) { Serial.println("Could not find BME280!"); }
//while (1);
}
// Weather monitoring See chapter 3.5 Recommended modes of operation
bme.setSampling(Adafruit_BME280::MODE_FORCED,
Adafruit_BME280::SAMPLING_X1, // temperature
Adafruit_BME280::SAMPLING_X1, // pressure
Adafruit_BME280::SAMPLING_X1, // humidity
Adafruit_BME280::FILTER_OFF );
// read values from the sensor
float temperature, humidity, pressure;
if (BMEStatus)
{
temperature = bme.readTemperature();
humidity = bme.readHumidity();
pressure = bme.readPressure() / 100.0F;
}
else
{
if (DEBUG) Serial.println("Could not find BME280!");
temperature=0;
humidity=0;
pressure=0;
}
float voltage = ESP.getVcc();
voltage = voltage/1024.0; //volt
if (DEBUG)
{
Serial.println("T= " + String(temperature) + "°C H= " + String(humidity) + "% P=" + String(pressure) + "hPa V=" + voltage + "V");
}
// Construct MQTT payload
payload="field1=";
payload+=temperature;
payload+="&field2=";
payload+=humidity;
payload+="&field3=";
payload+=pressure;
payload+="&field4=";
payload+=voltage;
payload+="&status=MQTTPUBLISH";
//Connect to Wifi
if (DEBUG)
{
Serial.println();
Serial.print("\nConnecting to WiFi SSID ");
Serial.print(SECRET_SSID);
}
WiFi.begin(SECRET_SSID, SECRET_PASS);
int timeOut=10; // Time out to connect is 10 seconds
while ((WiFi.status() != WL_CONNECTED) && timeOut>0)
{
delay(1000);
if (DEBUG) { Serial.print("."); }
timeOut--;
}
if (timeOut==0) //No WiFi!
{
if (DEBUG) Serial.println("\nTimeOut Connection, go to sleep!\n\n");
ESP.deepSleep(1E6 * UPDATE_INTERVAL_SECONDS);
}
if (DEBUG) // Yes WiFi
{
Serial.print("\nWiFi connected with IP address: ");
Serial.println(WiFi.localIP());
}
// Reconnect if MQTT client is not connected.
if (!client.connected())
{
reconnect();
}
mqttpublish();
delay(200); // Waiting for transmission to complete!!! (ci vuole)
WiFi.disconnect( true );
delay( 1 );
if (DEBUG) { Serial.println("Go to sleep!\n\n"); }
// Sleep ESP and disable wifi at wakeup
ESP.deepSleep( 1E6 * UPDATE_INTERVAL_SECONDS, WAKE_RF_DISABLED );
}
void loop()
{
//there's nothing to do
}
void mqttpublish()
{
// read values from the sensor
float temperature, humidity, pressure;
if (DEBUG)
{
Serial.print("Sending payload: ");
Serial.println(payload);
}
// Create a topic string and publish data to ThingSpeak channel feed.
String topicString ="channels/" + String( channelID ) + "/publish/"+String(writeAPIKey);
unsigned int length=topicString.length();
char topicBuffer[length];
topicString.toCharArray(topicBuffer,length+1);
if (client.publish(topicBuffer, (char*) payload.c_str()))
{
if (DEBUG) Serial.println("Publish ok");
}
else
{
if (DEBUG) Serial.println("Publish failed");
}
}
void reconnect()
{
String clientName="MY-ESP";
// Loop until we're reconnected
while (!client.connected())
{
if (DEBUG) Serial.println("Attempting MQTT connection...");
// Try to connect to the MQTT broker
if (client.connect((char*) clientName.c_str()))
{
if (DEBUG) Serial.println("Connected");
}
else
{
if (DEBUG)
{
Serial.print("failed, try again");
// Print to know why the connection failed.
// See http://pubsubclient.knolleary.net/api.html#state for the failure code explanation.
Serial.print(client.state());
Serial.println(" try again in 2 seconds");
}
delay(2000);
}
}
}
I keep getting this error message when trying to run my code, I'm confident my wiring is correct and I do not know what this error means-
Library 'Servo' is not uploaded to the board. Clear the current Arduino object and recreate it to include the appropriate library. For a list of available libraries, type 'listArduinoLibraries'.
here is my code
a=arduino();
s1 = servo(a, 'D9', 'MinPulseDuration', 700*10^-6, 'MaxPulseDuration', 2300*10^-6);
writePosition(s1,0);
userResponse = "yes";
while userResponse == "yes"
chicken = input("Insert your resistor");
voltage = readVoltage(a, "A0");
if voltage < 1.67155
resistor = "47k";
writePosition(s1,0.25);
minR = 47000 * 0.95;
maxR = 47000 * 1.05;
elseif voltage < 3.53128
resistor = "10k";
writePosition(s1,0.5);
minR = 10000 * 0.95;
maxR = 10000 * 1.05;
elseif voltage < 4.69941
resistor = "1k";
writePosition(s1,0.75);
minR = 1000 * 0.95;
maxR = 1000 * 1.05;
else
resistor = "330";
writePosition(s1,1);
minR = 330 * 0.95;
maxR = 330 * 1.05;
end
resistance = voltageToResistance(voltage);
withinTolerance = (resistance >= minR && resistance <= maxR);
disp(resistor)
if withinTolerance == 1
writeDigitalPin(a, "D4", 1);
writeDigitalPin(a, "D5", 0);
%disp("green")
else
writeDigitalPin(a, "D4", 0);
writeDigitalPin(a, "D5", 1);
%disp("Red")
end
userResponse = input("Would you like to check another resistor? ","s");
writePosition(s1,0);
writeDigitalPin(a, "D4", 0);
writeDigitalPin(a, "D5", 0);
end
How to Simulate a Synchronous Compensator in Simulink?
I have been having problems sending ThingSpeak alerts so I created a simple routine that demonstrates the problem. The code executes successfully but I never receive an email with the alert. What am I doing wrong?
% Set Thingspeak address, alerts API key, and options for the HTTTP call
alertUrl = "https://api.thingspeak.com/alerts/send";
alertApiKey = "TAKxxxxxxxxxxxxxxxx";
options = weboptions("HeaderFields",["ThingSpeak-Alerts-API-Key",alertApiKey]);
% Set content for email subject and body.
alertSubject = "ThingSpeak Alert Subject";
alertBody = "ThingSpeak Alert Body";
% Catch errors so the MATLAB code does not disable a TimeControl if it fails
try
webwrite(alertUrl, "body", alertBody, "subject", alertSubject, options);
catch Exception
fprintf("Failed to send alert: %s\n", Exception.message);
end
Am running multiple sensors in the field producing strings of data then sending them to a node. The node is an Arduino Uno on which SIM 800 is attached for internet connectivity. After computation, the result is several strings that i want to display to things speak. The code i have so far can only upload numerical data. Am in need of help to display these strings in Thingsspeak.Help me.
Dear Team,
I have populated my data on ThingsBoard platform using ESP8266, now I want to read that data using MATLAB Industrial Communication Toolbox. I have written a code for this purpose below,
% Replace these values with your ThingsBoard MQTT broker details
brokerAddress = "ssl://demo.thingsboard.io"; % Adjust the broker address
port = 1883; % Use the appropriate port for secure MQTT
% Replace these values with your ThingsBoard device details
clientID = "";
userName = "";
password = ""; % Leave empty if not required
% Replace this with the path to the root certificate you downloaded
rootCert = "";
% Create an MQTT client
mqClient = mqttclient(brokerAddress, 'Port', port, 'ClientID', clientID, ...
'Username', userName, 'Password', password, 'CARootCertificate', rootCert);
% Check if the connection is established
mqClient.Connected
% Expected output: ans = int32(1)
% Subscribe to the telemetry topic
topicToSub = "v1/devices/me/telemetry";
subscribe(mqClient, topicToSub);
% Wait for a while to receive messages (adjust the time as needed)
pause(60);
% Peek at the MQTT client to view received messages
peek(mqClient);
% Close the MQTT client
clear mqClient;
%%%%__________________Output Result______________________%%%%%
>> MQTT_Receive
Warning: Using a port that allows unencrypted communication. For confidential matters, considering using an encryption
enforcing port, such as 8883.
Error using MQTT_Receive
Failed to establish a connection with broker "ssl://demo.thingsboard.io".
I desperately seeking your assistance in this regard
Hello,
I have to draw root-locus for longitudinal motion; Short Period Mode and Phugoid Mode. Here is a code
%% Dynamics
Vp = 111.174
A_lon = [-0.0283 0.3139 -11.0665 -32.0344;
-0.4204 -1.5452 108.6931 -3.2616;
0.0205 -0.2011 -3.5080 0;
0 0 1 0]
B_lon = [0.0115 0.1150;
-0.2185 0;
-0.3591 0;
0 0]
C_lon = [1 0 0 0;
0 -1 0 Vp]
%% LQR Servo Design
A_servo = [A_lon zeros(4,2);
-C_lon zeros(2,2)]
B_servo = [B_lon ; zeros(2,2)]
n = 100; a = logspace(-2,2,n);
for i = 1:n
Q = a(i)*[1 0 0 0 0 0;
0 1 0 -Vp 0 0;
0 0 0 0 0 0;
0 -Vp 0 power(Vp,2) 0 0;
0 0 0 0 1 0;
0 0 0 0 0 1];
R = eye(2);
[K,S,P] = lqr(A_servo,B_servo,Q,R);
p_cl = P;
cl_sh(i,1) = p_cl(5); cl_sh(i,2) = p_cl(6);
cl_ph(i,1) = p_cl(3); cl_ph(i,2) = p_cl(4);
end
%% Plot
figure;
plot(real(cl_sh(:,1)), imag(cl_sh(:,1)), '+', real(cl_sh(:,2)), imag(cl_sh(:,2)), 'x', MarkerSize=5);
title("Root Locus of Short Period Mode")
xlabel("real")
ylabel("imag")
grid on;
figure;
plot(real(cl_ph(:,1)), imag(cl_ph(:,1)), '+', real(cl_ph(:,2)), imag(cl_ph(:,2)), 'x', MarkerSize=5)
title("Root Locus of Phugoid Mode")
xlabel("real")
ylabel("imag")
grid on;
When the code is executed, the sequence of eigenvalues is misaligned from some point in the iteration statement and the point was depended on weight of Q, R matrix. So when the sequence of eigenvalues is out of order from a certain point in time like this, how should we modify the code to solve it?
I'm logging data which I'd like to see on a daily basis. ie each day the chart x axis resets to 12midnight to 12midnight for the current day and just shows todays data. Is this possible please ?
Hello everyone. I'm beginner at MATLAB and I have 12 lead ECG database for my project. I have to see and investigate ECG signal but I couldn't find how to do it. Does anyone know how to combine these 12 lead data and obtain a clear ECG?
Hi,
I am now to appbulding, however I'am trying to build a app with appdesigner, but I cant find out how to change baground color of tree subnode and how to change color of text in subnode.
Is it even possible in appdesigner or in Matlab?
Or can I somehow use html to do this?
Can you help me find the solution?
Thank you very much.
Hello,
What is the difference between a moving angle and a normal angle?
Compute the Rotation about Y-axis over moving angle a = 30°
then
rotation about X-axis of angle β= 45°
What will the code like?
Thank you
Hello everyone, I'm using Simulink for running simulations, and I'd like to call a trained machine learning model (in my case, a TreeBagger) in MATLAB to make predictions in Simulink. However, I'm having some trouble with it. Has anyone already worked with this?
Hello there, I have a Amesim Black box model in Simulink. On my desktop, it works well. Also i tried to run on other desktops. Most of them work well. But some of them gives following error: Error in 'Model' while executing C MEX S-function 'Model', (mdlInitializeConditions), at time 0.0. Caused by: in Simcenter Amesim mexfunction: 'Model', Simcenter Amesim fatal error Cannot initialize Simcenter Amesim Model. EXIT This is an urgent case for me. Could you please help me?
Thank you so much.
