alex9ufo 聰明人求知心切

2024年10月3日星期四

WOKWI MQTT&Node-Red (DHT22 & 16*2 LCD & LED)

前一篇的延伸

https://alex9ufoexploer.blogspot.com/2024/10/wokwi-mqtt-dht22-162-lcd-led.html

MQTT相關資料

const char* mqtt_server = "broker.mqttgo.io";
//const char* mqtt_server = "test.mosquitto.org";

const char Pubtopic1[]  = "alex9ufo/temp";
const char Pubtopic2[]  = "alex9ufo/hum";
const char Subtopic1[]  = "alex9ufo/command";

WOKWI程式

#include <WiFi.h>
#include <PubSubClient.h>
#include <LiquidCrystal_I2C.h>
#include "DHTesp.h"

const int DHT_PIN = 15;
const int LED = 2;

DHTesp dhtSensor;

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

// Update these with values suitable for your network.
const char* ssid =  "Wokwi-GUEST";   // your network SSID (name) 
const char* password = "";   // your network password
//const char* mqtt_server = "broker.mqttdashboard.com";// choose your mqtt server
const char* mqtt_server = "broker.mqttgo.io";
//const char* mqtt_server = "test.mosquitto.org";

const char Pubtopic1[]  = "alex9ufo/temp";
const char Pubtopic2[]  = "alex9ufo/hum";
const char Subtopic1[]  = "alex9ufo/command";

WiFiClient espClient;
PubSubClient client(espClient);

long lastMsg = 0;
char msg[50];
int value = 0;

//=========================================================
void callback(char* topic, byte* payload, unsigned int length) 
{
  Serial.print("Command from MQTT broker is : [");
  Serial.print(topic);
  Serial.print("]");
  Serial.println();
  Serial.print(" publish data is:");
  lcd.clear();
  String message="";
  {
    for(int i=0;i<length;i++)
    {
      Serial.print((char)payload[i]);  
      message +=(char)payload[i];

      lcd.setCursor(0, 0);
      lcd.print("alex9ufo LCD"); // Start Print text to Line 1
      lcd.setCursor(i, 1);
      lcd.write((char)payload[i]);
    }
  }
  
  //Serial.println(message);
  message.trim();

  if (message == "on") {
      digitalWrite(LED, LOW);  // Turn on the LED
      Serial.print("LED = on ");
  }

  if (message == "off" ) {
      digitalWrite(LED, HIGH); // Turn off the LED
      Serial.print("LED = off ");
  }

  Serial.println();
} //end callback
//=========================================================
void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) 
  {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    //if you MQTT broker has clientID,username and password
    //please change following line to    if (client.connect(clientId,userName,passWord))
    if (client.connect(clientId.c_str()))
    {
      Serial.println("connected");
      //once connected to MQTT broker, subscribe command if any
      //client.subscribe("alex9ufo/Command");
      client.subscribe(Subtopic1);

    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 6 seconds before retrying
      delay(6000);
    }
  }
} //end reconnect()
//=========================================================
void setup_wifi() {
   delay(100);
  // We start by connecting to a WiFi network
    Serial.print("Connecting to ");
    Serial.println(ssid);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) 
    {
      delay(500);
      Serial.print(".");
    }
  randomSeed(micros());
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}
//=========================================================


void setup() {
  Serial.begin(115200);
  
  pinMode(LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  
  // Init
  lcd.init();
  lcd.backlight();

  // Print something
  lcd.setCursor(3, 0);
  lcd.print("Welcome to");
  lcd.setCursor(2, 1);
  lcd.print("lcd display");
  lcd.setCursor(5, 2);
  lcd.print("Simulator");
  lcd.setCursor(7, 3);
  lcd.print("Enjoy!");
}


void loop() {
    if (!client.connected()) {
    reconnect();
  }
  client.setCallback(callback);
  client.loop();
  unsigned long now = millis();
  if (now - lastMsg > 5000) {
    lastMsg = now;
    TempAndHumidity  data = dhtSensor.getTempAndHumidity();

    String temp = String(data.temperature, 2);
    Serial.print("Temperature: ");
    Serial.println(temp);
    client.publish("alex9ufo/temp", temp.c_str());
    
    String hum = String(data.humidity, 1);
    Serial.print("Humidity: ");
    Serial.println(hum);
    client.publish("alex9ufo/hum", hum.c_str());
  }
}

Node-Red程式

2024年10月2日星期三

WOKWI MQTT (DHT22 & 16*2 LCD & LED)

const char* mqtt_server = "broker.mqttgo.io";

const char Pubtopic1[]  = "alex9ufo/temp";

const char Pubtopic2[]  = "alex9ufo/hum";

const char Subtopic1[]  = "alex9ufo/command";

WOKWI程式

#include <WiFi.h>
#include <PubSubClient.h>
#include <LiquidCrystal_I2C.h>
#include "DHTesp.h"

const int DHT_PIN = 15;
const int LED = 2;

DHTesp dhtSensor;

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

// Update these with values suitable for your network.
const char* ssid =  "Wokwi-GUEST";   // your network SSID (name) 
const char* password = "";   // your network password
//const char* mqtt_server = "broker.mqttdashboard.com";// choose your mqtt server
const char* mqtt_server = "broker.mqttgo.io";
//const char* mqtt_server = "test.mosquitto.org";

const char Pubtopic1[]  = "alex9ufo/temp";
const char Pubtopic2[]  = "alex9ufo/hum";
const char Subtopic1[]  = "alex9ufo/command";

WiFiClient espClient;
PubSubClient client(espClient);

long lastMsg = 0;
char msg[50];
int value = 0;

//=========================================================
void callback(char* topic, byte* payload, unsigned int length) 
{
  Serial.print("Command from MQTT broker is : [");
  Serial.print(topic);
  Serial.print("]");
  Serial.println();
  Serial.print(" publish data is:");
  lcd.clear();
  String message="";
  {
    for(int i=0;i<length;i++)
    {
      Serial.print((char)payload[i]);  
      message +=(char)payload[i];

      lcd.setCursor(0, 0);
      lcd.print("alex9ufo LCD"); // Start Print text to Line 1
      lcd.setCursor(i, 1);
      lcd.write((char)payload[i]);
    }
  }
  
  //Serial.println(message);
  message.trim();

  if (message == "on") {
      digitalWrite(LED, LOW);  // Turn on the LED
      Serial.print("LED = on ");
  }

  if (message == "off" ) {
      digitalWrite(LED, HIGH); // Turn off the LED
      Serial.print("LED = off ");
  }

  Serial.println();
} //end callback
//=========================================================
void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) 
  {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    //if you MQTT broker has clientID,username and password
    //please change following line to    if (client.connect(clientId,userName,passWord))
    if (client.connect(clientId.c_str()))
    {
      Serial.println("connected");
      //once connected to MQTT broker, subscribe command if any
      //client.subscribe("alex9ufo/Command");
      client.subscribe(Subtopic1);

    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 6 seconds before retrying
      delay(6000);
    }
  }
} //end reconnect()
//=========================================================
void setup_wifi() {
   delay(100);
  // We start by connecting to a WiFi network
    Serial.print("Connecting to ");
    Serial.println(ssid);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) 
    {
      delay(500);
      Serial.print(".");
    }
  randomSeed(micros());
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}
//=========================================================


void setup() {
  Serial.begin(115200);
  
  pinMode(LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  
  // Init
  lcd.init();
  lcd.backlight();

  // Print something
  lcd.setCursor(3, 0);
  lcd.print("Welcome to");
  lcd.setCursor(2, 1);
  lcd.print("lcd display");
  lcd.setCursor(5, 2);
  lcd.print("Simulator");
  lcd.setCursor(7, 3);
  lcd.print("Enjoy!");
}


void loop() {
    if (!client.connected()) {
    reconnect();
  }
  client.setCallback(callback);
  client.loop();
  unsigned long now = millis();
  if (now - lastMsg > 5000) {
    lastMsg = now;
    TempAndHumidity  data = dhtSensor.getTempAndHumidity();

    String temp = String(data.temperature, 2);
    Serial.print("Temperature: ");
    Serial.println(temp);
    client.publish("alex9ufo/temp", temp.c_str());
    
    String hum = String(data.humidity, 1);
    Serial.print("Humidity: ");
    Serial.println(hum);
    client.publish("alex9ufo/hum", hum.c_str());
  }
}

2024年9月25日星期三

數位媒體課程

源自於嘉義縣立永慶高級中學

https://www.ycsh.cyc.edu.tw/modules/tad_web/news.php?WebID=2&NewsID=16

數位媒體課程

課程名稱：BRICKS 互動式AI數位看板		適合對象：高中(職)學生
單元一	認識Node-RED&MQTT&Opendata&JSON格式	時間：57分	觀賞影片
單元二	Node-RED安裝與功能介紹&LINE Notify	時間：132分	觀賞影片
單元三	Node-RED進階應用與串接MQTT&數位面板	時間：178分	觀賞影片
教學資料下載：PPT簡報 Node-RED軟體下載程式範例(AQI管理) LINE Notify 程式範例(MQTT資料傳輸測試) 程式範例(MQTT數位儀表板練習) 練習圖片 MicrosoftEdge下載備註:程式範例下載請在文字上方按下滑鼠右鍵->>另存連結為... 即可順利下載到電腦中

2024年9月19日星期四

第一次作業 1219 ,RFID應用(四技日間部),國秀樓302教室, [選,3, 3], 四電三選7

第一次作業

1219 ,RFID應用(四技日間部),國秀樓302教室, [選,3, 3], 四電三選7

https://www.mediafire.com

超連結下載

https://www.mediafire.com/file/e297c5zkqaplo7z/RFID%25E6%2587%2589%25E7%2594%25A8%25E7%25AC%25AC%25E4%25B8%2580%25E6%25AC%25A1_%25E4%25BD%259C%25E6%25A5%25AD_%2528WOKWI%2529.pdf/file

2024年8月17日星期六

Arduino 物聯網應用 - 上課教材

https://dic.vbird.tw/arduino/list.php

Arduino 物聯網應用 - 課程列表

我們會從 Arduino 的認識、IDE 環境的熟悉、與操作電腦的序列埠連動的功能、Arduino 開發語言的熟悉、 簡單的 LED 燈號控制同時與電阻功能的認識、由序列埠直接傳送互動參數的應用、各項基礎感測器的設計、 LCD 顯示器的應用、wifi 與藍芽的應用等，看看最終能不能連結到樹莓派來傳輸與互動囉！

使用教材：

....

注意事項：

課程列表：

MQTT Basic2 (WOKWI ESP32 + MQTT Box )

使用 <ArduinoMqttClient.h> library

主題有修正如下
const char broker[] = "test.mosquitto.org";
int port = 1883;
const char Pubtopic1[] = "alex9ufo/hello";
const char Subtopic2[] = "alex9ufo/led";
message == "on" 亮 message == "off" 熄

WOKWI程式

#include <ArduinoMqttClient.h>
#include <WiFi.h>

///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] =  "Wokwi-GUEST"; // your network SSID (name)
char pass[] =  "" ;           // your network password (use for WPA, or use as key for WEP)

WiFiClient wifiClient;
MqttClient mqttClient(wifiClient);

const char broker[] = "test.mosquitto.org";
int        port     = 1883;
const char Pubtopic1[]  = "alex9ufo/hello";
const char Subtopic2[]  = "alex9ufo/led";
const char willTopic[] = "alex9ufo/Starting";

//set interval for sending messages (milliseconds)

const long interval = 8000;
unsigned long previousMillis = 0;

int count = 0;
const int LED = 2;
char msg[50];
int value = 0;

//=======================================================================
void onMqttMessage(int messageSize) {
  // we received a message, print out the topic and contents
  Serial.println("Received a message with topic '");
  Serial.print(mqttClient.messageTopic());
  Serial.print("', length ");
  Serial.print(messageSize);
  Serial.println(" bytes:");
  String Topic= mqttClient.messageTopic();

  String message="";
  // use the Stream interface to print the contents
  while (mqttClient.available()) {
    //Serial.print((char)mqttClient.read());
    message += (char)mqttClient.read();
  }
  Serial.println(message);
  message.trim();
  Topic.trim();

  if (Topic=="alex9ufo/led") {
    if (message == "on") {
      digitalWrite(LED, LOW);  // Turn on the LED
      Serial.print("LED = on ");
    }

    if (message == "off" ) {
      digitalWrite(LED, HIGH); // Turn off the LED
      Serial.print("LED = off ");
    }
  }
  Serial.println();
  Serial.println();
}

//=======================================================================
//副程式  setup wifi
void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);     //print ssid
  WiFi.begin(ssid, pass);  //初始化WiFi 函式庫並回傳目前的網路狀態
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }   //假設 wifi 未連接 show ………

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}  

//=======================================================================
void setup() {
  //Initialize serial and wait for port to open:
  Serial.begin(115200);
  pinMode(LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output

  Serial.begin(115200);   // Initialize serial communications with the PC
  while (!Serial);    // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
  
  setup_wifi();
  Serial.println("You're connected to the network");
  Serial.println();
  
  String willPayload = "ESP32 Start working....!";
  bool willRetain = true;
  int willQos = 1;

  mqttClient.beginWill(willTopic, willPayload.length(), willRetain, willQos);
  mqttClient.print(willPayload);
  mqttClient.endWill();

  Serial.print("Attempting to connect to the MQTT broker: ");
  Serial.println(broker);

  if (!mqttClient.connect(broker, port)) {
    Serial.print("MQTT connection failed! Error code = ");
    Serial.println(mqttClient.connectError());

    while (1);
  }

  Serial.println("You're connected to the MQTT broker!");
  Serial.println();

  // set the message receive callback
  mqttClient.onMessage(onMqttMessage);
  Serial.print("Subscribing to topic: ");
  Serial.println(Subtopic2);
  // subscribe to a topic
  // the second parameter sets the QoS of the subscription,
  // the the library supports subscribing at QoS 0, 1, or 2
  int subscribeQos = 1;
  mqttClient.subscribe(Subtopic2, subscribeQos);

}

//=======================================================================
void loop() {
  // call poll() regularly to allow the library to send MQTT keep alive which
  // avoids being disconnected by the broker
  mqttClient.poll();

  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    // save the last time a message was sent
    previousMillis = currentMillis;

    //record random value from A0, A1 and A2
    ++value;
    snprintf (msg, 75, "hello world #%ld", value);
    Serial.print("Publish message: ");
    Serial.println(msg);

    Serial.print("Sending message to topic: ");
    Serial.println(Pubtopic1);
    Serial.println(msg);

    // send message, the Print interface can be used to set the message contents
    mqttClient.beginMessage(Pubtopic1);
    mqttClient.print(msg);
    mqttClient.endMessage();

    Serial.println();
  }
}

2024年8月16日星期五

MQTT Basic (WOKWI ESP32 + MQTT Box )

MQTT Basic (WOKWI ESP32 + MQTT Box )

WOKWI程式

/*
 Basic ESP32 MQTT example
*/

#include <WiFi.h>
#include <PubSubClient.h>

// Update these with values suitable for your network.

const char* ssid = "Wokwi-GUEST";
const char* password = "";
//const char* mqtt_server = "broker.mqtt-dashboard.com";
const char* mqtt_server = "test.mosquitto.org";

WiFiClient espClient;
PubSubClient client(espClient);

#define LED 2

long lastMsg = 0;
char msg[50];
int value = 0;


//================================
void setup_wifi() {

  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}
//============================================================
void callback(char* topic, byte* message, unsigned int length) {
  printPayload(topic, message, length);  
}

void printPayload(char* topic, byte* message, unsigned int length) {
  // Printing Received Message
  Serial.print("Message received on topic: ");
  Serial.println(topic);

  String messageTemp;
  for(int i=0; i<length; i+=1) {
    messageTemp += (char)message[i];
  }
  if(String(topic) == "alex9ufo/esp32/led"){
      if(messageTemp=="ON"){
        Serial.println("Led ON");
        digitalWrite(LED,LOW);
      }  
      if(messageTemp=="OFF"){
        Serial.println("Led OFF");
        digitalWrite(LED,HIGH);
      }
  }
  Serial.println(messageTemp);
}
//============================================================
void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish("alex9ufo/esp32/hello", "hello world");
      // ... and resubscribe
      client.subscribe("alex9ufo/esp32/led");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}
//============================================================
void setup() {
  pinMode(LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
  digitalWrite(LED,HIGH);

  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}
//============================================================
void loop() {

  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  long now = millis();
  if (now - lastMsg > 8000) {
    lastMsg = now;
    ++value;
    snprintf (msg, 75, "hello world #%ld", value);
    Serial.print("Publish message: ");
    Serial.println(msg);
    client.publish("alex9ufo/esp32/hello", msg);
  }
}
//============================================================

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Arduino 物聯網應用 - 上課教材

Arduino 物聯網應用 - 課程列表

2024年8月16日 星期五

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2024年9月19日星期四

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