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In many universities, introductory programming is taught as a foundation course. Students from different departments are usually brought together to learn to program in these foundation courses. Their home departments may have a programming language preference and that preference may change from department to department. Some universities either strictly teach one language in a single course, some of them teach multiple languages in the same course and give students the flexibility to choose their language for the assignments and projects. How can we make students multilingual when it comes to programming? Is there a way to teach multiple languages in a fair light, side by side without creating a new course or sacrificing one language to teach the other one? Dr. Nathan Kutz from the University of Washington found a creative way to teach MATLAB and Python side by side in his AMATH 301 course. This course is an introductory programming course at the University of Washington and almost all engineering students take it. Do you wonder how Dr. Kutz taught this course? Check out these recordings and course resources! They can be utilized in an in-person or a distance learning setting:
I'm monitoring a temp and humidity sensor outside of my house using a ESP32. I have it update every 15 minutes. On my channel I have a chart and numeric readout. The readout shows me that it is updating every 15 minutes but the chart's last update was 2 hours ago. This was working until I went into the properties of the chart and changed the time base from daily to 12 hours. I have tried refreshing the page, signing out and back in as well as reboot the computer, still 2 hours behind. Is there something else I have to do to reestablish the chart?
Thanks John
If you are a student or researcher looking for a project idea, have a look at the MathWorks Excellence in Innovation site. There is at least one IoT-based project for a Smart watering system, and a project with a Digital twin of a pneumatic system. If you ask me, most of the other projects could also be enhanced with an IoT based component shared on ThingSpeak!
#include <Keypad.h> #include <Wire.h> #include <LiquidCrystal_I2C.h> #include <SoftwareSerial.h>
LiquidCrystal_I2C lcd(0x27, 16, 2); SoftwareSerial ESP01(2, 3);
const byte ROWS = 4; // four rows
const byte COLS = 3; // three columns
char keys[ROWS][COLS] = { // keypad labels
{'1', '2', '3'},
{'4', '5', '6'},
{'7', '8', '9'},
{'*', '0', '#'}
};
byte rowPins[ROWS] = {12, 7, 8, 10}; //connect to keypad pins 12, 7, 8, 10
byte colPins[COLS] = {11, 13, 9}; // connect to keypad pins 11, 13, 9 column pinouts
Keypad customKeypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
#define Password_Length 5 #define DEBUG true #define IP "184.106.153.149"
// define pin numbers int buzzer = 5; // buzzer is connected to pin 5 int PIR = 6; // PIR is connected to pin 6
// intruder alarm password char Data[Password_Length]; char Master[Password_Length] = "1234"; byte data_count = 0, master_count = 0; bool Pass_is_good; char customKey; int val = 0;
// thingspeak & WiFi String apiKey = "xxxxxxxxxxxxxxxx"; // thingspeak API key
void setup() {
lcd.init();
lcd.backlight();
pinMode(buzzer, OUTPUT);
pinMode(PIR, INPUT);
Serial.begin(9600);
while (!Serial){
}
Serial.println("Starting...");
ESP01.begin(9600);
// Reset ESP8266, put it into mode 1 i.e. STA only, make it join hotspot / AP,
// establish single connection
ESP01.println();
sendData("AT+RST\r\n",2000,DEBUG);
sendData("AT+CWMODE=1\r\n",2000,DEBUG);
sendData("AT+CWJAP=\"AiPhone\",\"123889\"\r\n",20000,DEBUG);
sendData("AT+CIPMUX=0\r\n",4000,DEBUG);
// Make TCP connection String cmd = "AT+CIPSTART=\"TCP\",\""; cmd += "184.106.153.149"; // Thingspeak.com's IP address cmd += "\",80\r\n"; sendData(cmd,4000,DEBUG);
// Read PIR sensor value val = digitalRead(PIR); // check if there was a state transition
String val1 = String(val);
if (val == HIGH)
{
Serial.println("Motion detected!");
delay(10);
Serial.println(val1);
}
else
{
Serial.println("Asleep");
delay(10);
//String val1 = String(val);
Serial.println(val1);
}
//String val1 = String(val);
//Serial.println(val1);//Prepare GET string String getStr = "GET /update?api_key="; getStr += apiKey; getStr += "&field1="; getStr += val1; getStr +="\r\n";
// Send data length & GET string
ESP01.print("AT+CIPSEND=");
ESP01.println (getStr.length());
Serial.print("AT+CIPSEND=");
Serial.println(getStr.length());
delay(500);
if(ESP01.find (">"))
{
Serial.print(">");
sendData(getStr, 2000, DEBUG);
}
//Close connection, wait a while before repeating
sendData("AT+CIPCLOSE", 16000, DEBUG); // 15 seconds delay between updates
}
if true
% code
endvoid loop() {
if (digitalRead(PIR) == HIGH)
{
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("Enter Password: ");
customKey = customKeypad.getKey();
if (customKey)
{
Data[data_count] = customKey;
lcd.setCursor(data_count, 1);
lcd.print(Data[data_count]);
data_count++;
} if (data_count == Password_Length - 1)
{
lcd.clear(); if (!strcmp(Data, Master))
{
lcd.print("OK");
digitalWrite(buzzer, HIGH);
delay(200);
digitalWrite(buzzer, LOW);
delay(200);
digitalWrite(buzzer, HIGH);
delay(200);
digitalWrite(buzzer, LOW);
}
else
{
lcd.print("Wrong Password");
digitalWrite(buzzer, HIGH);
delay(1000);
digitalWrite(buzzer, LOW);
} lcd.clear();
clearData();
}
}
else
{
lcd.noBacklight(); // turn backlight off
lcd.clear(); // clear display
delay(250);
}
}String sendData(String command, const int timeout, boolean debug)
{
String response = "";
ESP01.print(command);
long int time = millis();
while( (time+timeout) > millis())
{
while(ESP01.available())
{
// "Construct" response from ESP01 as follows
// - this is to be displayed on Serial Monitor.
char c = ESP01.read(); // read the next character.
response+=c;
}
} if(debug)
{
Serial.print(response);
}return (response); }
void clearData() {
while (data_count != 0)
{
Data[data_count--] = 0;
}
return;
}
I built a safe entry mechanism and i would like the matlab to send an email alert when arduino is not communicating or sending any data to thingspeak. How do i write the program to detect system down and to send email alert?
Hi, I want to send an alert to multiple email ids when a channel event occurs(for example:sensor temperature exceeds a threshold value).How can I do it?Help is highly appreciated. Thanks in Advance!
EL TERMÓMETRO QUEDO CLAVADO EN -127°, LO RESETEE PERO AUN NO FUNCIONA, POSRA SER LA ZONDA Y SI FUESE ASÍ COMO ADQUIRIRLA-
Are you looking for ways to keep your students engaged in a virtual setting? Would you like to spice up your courses with hands-on projects? Using Arduino Engineering Kit, you can achieve these. Due to COVID-19, many instructors started to look for creative ways of giving students a lab experience. Some of them chose to create virtual labs, some of them designed hardware projects with low-cost hardware or integrated hardware projects kits to their curriculum. If you are interested in how Dr. Azadi from San Francisco State University used Arduino Engineering Kit during the pandemic to teach his Mechatronics course, check out these articles:
Hello, in the free usage of ThingSpeak, minimum data rate is 15 s. I have received a message that I will run messages in a month, and I would like to reduce the data rate, but I cannot find information of neither which is the current data rate that it's established in my channels, nor how might I modify it. I would like to reduce the rate at which I send data, as I actually do not need this rate to be high, but I cannot figure out how to do it. I am afraid I know little of how to "program" thingspeak, for creating my channels I followed the tutorials on "getting started with Thingspeak", and it worked quite well, but I have no idea which is the data rate that is being used or how to modify it. I will be really greatful if somebody may help me to learn how to do this.
Just getting started with Thingspeak, I'm reading temperature, humidity and pressure from a BME280 connected to a ESP32. I have both a chart and numeric display on my channels, works great.
Can I resize the visualizations to get more on the monitor at a time? Or can I add a numeric readout that will show the last value added to the chart? Both the chart and readout use the same field info. I do see that if I hover my mouse over a point on the chart I get the value but wanted to be displayed.
Thanks for any help John
Hi, this is my first question here... hope not to bother you all. Is it possible to stop a sensor from collecting data by using ThingSpeak/MQTT broker/MQTT protocol? How? I'm working with a MAX30102 for oxigen and bpm detection and I need to stop the sensor from ThingSpeak or at least this is what I was asked to do. At the moment I can't figure out how to do this except by using the APIkey and the HTTP protocol but my task was to only use MQTT protocol. Hope someone can help me finding a new point of view about this topic/problem.
EDIT: I solved the problem. I used another client, MQTTx to be precise, in order to send messages in a field of control. So, at the beginning I had just two fields (BPM and SpO2), then I added a third field of control. The board WeMos, connected to the sensor MH-ET LIVE MAX30102 was used to process the sensor's data and send them to Thingspeak every 15 seconds wherease the client desktop MQTTx was also connected to ThingSpeak's broker and enbled for both publish and subscribe and I used it to send messages of ON and OFF, literally, as payload for the control field. This messages were passed to the callBack function and the payload was checked in order to change the state of my code, nested in a switch system. Thamk's for the help to you all :) If you're interested to the code and the settings just let me know.
I need to model a brushless motor for which I only have the data of voltage, power, speed, nominal torque, starting torque, max current and total weight, which moves a bicycle. I have studied the Permanent Magnet Synchronous Machine power_pmmotor Simulink example, but I do not have all the required data. My question is whether it is possible to make an approximate model with my few data. I guess some data could be assumed, but I don't know what typical values would be correct. I would greatly appreciate any suggestion. My best regards.
I would like a free account on Thingspeak for 1 device/channel using lorawan and < 300 messages a day for non-commercial (home) use. Today I received an email from MathWorks that my trial period ends. Somewhere I read I may have indicated commercial usage when starting the Thingspeak account. But I cannot find it in Thingspeak profile, nor in my Mathworks profile. How to change this?
El termómetro quedo tildado en -127°, lo desconecte en varias oportunidades y se encuentra tildado.
Hello! A few years ago i could write data to my thingspeak field with this code on arduino with ESP8266.
However today when i try this i only get errors. Instead I have to use this code. it is almost the same but connecting without SSL on port 80 instead.
Has anything changed on thingspeaks side? What do i do wrong? Here is a link to the full code if thats needed: https://github.com/kjellcompany/Arduino_701/blob/master/Thingspeak/Thingspeak.ino
Recently, 2nd Jan 2022 my logging has stopped. In My Account I see I have an expiry date of 10/Jan/2022 could this be the cause??? Specifically does a Free Account eventually expire and besides paying for a student or Home account is there anything I can do to continue using ThingSpeak at no charge? My message count is well below the maximum of 3 million per year.
Bonjour, J'utilise arduino Mega 2560 avec le shield Ethernet. Le sketch ino joint ci-après me permet de visualiser la jauge dans la page index.htm chargée sur la carte SD. ThingSpeak affiche bien le graph correspondant. Mais ma page web n'y a pas accès. Comment intégrer les codes dans la page ou dans le sketch pour cela ? Je vous joins la capture d'écran de cette page ainsi que les codes De la page et du sketch. Merci pour votre aide.
*********************************** Code Page "index.htm" ***********************************
<!DOCTYPE html>
<html>
<head>
<title>Arduino Internet Voltmeter</title>
<script>
var data_val = 0; // raw data from Arduino analog input (0 to 1023)
var volts = 0; // voltage calculated from Arduino analog raw data value
var num_updates = 0; // number of 200ms periods used to calculate time to send data to ThingSpeak
// gauge code
eval(function(p,a,c,k,e,r){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('t W=v(f){W.2t.3T(A);A.B={Z:2u,19:1q,1h:1q,1J:U,1b:D,K:0,V:[\'0\',\'20\',\'40\',\'2A\',\'2B\',\'D\'],2r:10,2C:M,1E:U,2q:{2D:3,2E:2},2H:M,1c:{2j:10,2m:3y,2O:\'3v\'},J:{2P:\'#4h\',V:\'#31\',2r:\'#3k\',1J:\'#37\',1E:\'#37\',3e:\'#31\',1t:{2s:\'1e(3Y, 3d, 3d, 1)\',3c:\'1e(1Y, 5I, 5E, .9)\'}},1o:[{1n:20,1D:2A,1F:\'#3j\'},{1n:2A,1D:2B,1F:\'#36\'},{1n:2B,1D:D,1F:\'#5n\'}]};t g=0,1p=A,N=0,1S=0,1G=U;A.5d=v(a){N=f.1c?g:a;t b=(f.1b-f.K)/D;1S=a>f.1b?1S=f.1b+b:a<f.K?f.K-b:a;g=a;f.1c?3l():A.1g();C A};A.3m=v(a){N=g=a;A.1g();C A};A.4T=v(){g=N=1S=A.B.K;A.1g();C A};A.4R=v(){C g};A.13=v(){};v 2k(a,b){Q(t i 4P b){z(1H b[i]=="1W"&&!(4O.4y.2V.4p(b[i])===\'[1W 4n]\')&&i!=\'Z\'){z(1H 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// function called periodically to get analog value from Arduino using Ajax
function GetArduinoInputs()
{
nocache = "&nocache=" + Math.random() * 1000000;
var request = new XMLHttpRequest();
request.onreadystatechange = function()
{
if (this.readyState == 4) {
if (this.status == 200) {
if (this.responseXML != null) {
document.getElementById("input3").innerHTML =
this.responseXML.getElementsByTagName('analog')[0].childNodes[0].nodeValue;
data_val = this.responseXML.getElementsByTagName('analog')[0].childNodes[0].nodeValue;
// calculate voltage
volts = data_val * 3.5 / 1023;
// only send data to ThingSpeak every 20 seconds or 100 x 200ms
if (num_updates >= 100) {
num_updates = 0;
// send voltage to ThingSpeak
ThingSpeakSend("xxxxxxxxxxxxxxxx", volts); // insert your ThingSpeak Write API Key here
}
num_updates++;
}
}
}
}
request.open("GET", "ajax_inputs" + nocache, true);
request.send(null);
setTimeout('GetArduinoInputs()', 200); // send the request for Arduino analog data every 200ms
}
// function to send data to ThingSpeak
function ThingSpeakSend(api_write_key, voltage)
{
var ts_req = new XMLHttpRequest();
// GET request string - modify if more fields are needed
var req_str = "http://api.thingspeak.com/update?key=" + api_write_key + "&field1=" + voltage;
ts_req.onreadystatechange = function()
{
// not doing anything with response from ThingSpeak
}
// send the data to ThingSpeak
ts_req.open("GET", req_str, true);
ts_req.send(null);
}
</script>
</head>
<body onload="GetArduinoInputs()">
<h1>Arduino Internet Voltmeter</h1>
<p>Analog (A2): <span id="input3">...</span></p>
<canvas id="an_gauge_1" data-major-ticks="0 0.5 1 1.5 2 2.5 3 3.5" data-type="canv-gauge" data-min-value="0" data-max-value="3.5" data-onready="setInterval( function() { Gauge.Collection.get('an_gauge_1').setValue(volts);}, 200);"></canvas>
<!-- insert ThingSpeak chart code here -->
<iframe width="450" height="260" style="border: 1px solid #cccccc;" src="https://thingspeak.com/channels/1620920/charts/1?bgcolor=%23ffffff&color=%23d62020&dynamic=true&results=60&type=line&update=20&yaxismax=4&yaxismin=0"></iframe>
<!-- REPLACE THIS COMMENT WITH YOUR THINGSPEAK GRAPH -->
</body>
</html>********************************************* Code "eth_websrv_SD_Ajax_gauge.ino" : *********************************************
#include <Ethernet.h> #include <SD.h> #include <ThingSpeak.h>
// size of buffer used to capture HTTP requests #define REQ_BUF_SZ 50
// MAC address from Ethernet shield sticker under board
byte mac[] = { 0x90, 0xA2, 0xDA, 0x00, 0x1A, 0x71 };
IPAddress ip(192, 168, 1, 17); // IP address, may need to change depending on network
EthernetServer server(80); // create a server at port 80
File webFile; // the web page file on the SD card
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0; // index into HTTP_req buffer
void setup()
{
// disable Ethernet chip
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);
Serial.begin(9600); // for debugging
// initialize SD card
Serial.println("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println("ERROR - SD card initialization failed!");
return; // init failed
}
Serial.println("SUCCESS - SD card initialized.");
// check for index.htm file
if (!SD.exists("index.htm")) {
Serial.println("ERROR - Can't find index.htm file!");
return; // can't find index file
}
Serial.println("SUCCESS - Found index.htm file."); Ethernet.begin(mac, ip); // initialize Ethernet device
server.begin(); // start to listen for clients
Serial.print ("*\n -> Le serveur est sur l'adresse : ");
Serial.println(Ethernet.localIP());
}void loop()
{
EthernetClient client = server.available(); // try to get client
if (client) // got client?
{
boolean currentLineIsBlank = true; while (client.connected())
{
if (client.available()) // client data available to read
{
char c = client.read(); // read 1 byte (character) from client
// buffer first part of HTTP request in HTTP_req array (string)
// leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
if (req_index < (REQ_BUF_SZ - 1)) {
HTTP_req[req_index] = c; // save HTTP request character
req_index++;
}
// last line of client request is blank and ends with \n
// respond to client only after last line received
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
// remainder of header follows below, depending on if
// web page or XML page is requested
// Ajax request - send XML file
if (StrContains(HTTP_req, "ajax_inputs")) {
// send rest of HTTP header
client.println("Content-Type: text/xml");
client.println("Connection: keep-alive");
client.println(); // send XML file containing input states
XML_response(client);
}
else { // web page request
// send rest of HTTP header
client.println("Content-Type: text/html");
client.println("Connection: keep-alive");
client.println();
// send web page
webFile = SD.open("index.htm"); // open web page file
if (webFile) {
while(webFile.available()) {
client.write(webFile.read()); // send web page to client
}
webFile.close();
}
}
// display received HTTP request on serial port
Serial.print(HTTP_req);
// reset buffer index and all buffer elements to 0
req_index = 0;
StrClear(HTTP_req, REQ_BUF_SZ);
break;
}
// every line of text received from the client ends with \r\n
if (c == '\n') {
// last character on line of received text
// starting new line with next character read
currentLineIsBlank = true;
}
else if (c != '\r') {
// a text character was received from client
currentLineIsBlank = false;
}
} // end if (client.available())
} // end while (client.connected())
delay(1); // give the web browser time to receive the data
client.stop(); // close the connection
} // end if (client)
}// send the XML file containing analog value
void XML_response(EthernetClient cl)
{
int analog_val;
cl.print("<?xml version = \"1.0\" ?>");
cl.print("<inputs>");
// read analog pin A2
analog_val = analogRead(2);
cl.print("<analog>");
cl.print(analog_val);
cl.print("</analog>");
cl.print("</inputs>");
}// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
for (int i = 0; i < length; i++) {
str[i] = 0;
}
}
// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
char found = 0;
char index = 0;
char len;
len = strlen(str);
if (strlen(sfind) > len) {
return 0;
}
while (index < len) {
if (str[index] == sfind[found]) {
found++;
if (strlen(sfind) == found) {
return 1;
}
}
else {
found = 0;
}
index++;
}
return 0; }
My dear friend Ram and I have finished our latest movie series. You can watch the final movie , or see the whole series.
In this movie we show how you can use TimeControls and Reacts to control devices or to schedule your MATLAB code that you can write in ThingSpeak. We also discuss a bit about channel sharing.
Hi,
I am new to Matlab and looking to model complete EPS system starting with battery modelling. I have seen videos where the modelling is explained but looking for a one which can teach me from the scratch.
Is it possible to use the REST API to create ThingHTTP requests?
