專題指導(物聯網雲端應用)

2021/10/18 HCYang

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A. Adafruit.io

A-1. Arduino IDE 安裝擴充套件 PubSubClient



A-2. Arduino IDE 開發板管理員安裝 esp8266



A-3. NodeMCU(ESP12) Subscribe Message to UART

#include <ESP8266WiFi.h>
#include <PubSubClient.h>

// WiFi
const char *ssid = "CueMei";           // WiFi ssid
const char *password = "123456789";    // WiFi password

// MQTT Broker
const char *mqtt_broker = "io.adafruit.com";
const char *topic = "hcyang0207/feeds/home.control";
const char *mqtt_username = "hcyang0207";
const char *mqtt_password = "aio_BKwE178y7NDTg4K651**********";
const int mqtt_port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
    Serial.begin(9600);
    // connecting to a WiFi network
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        // Serial.println("Connecting to WiFi..");
    }
    // Serial.println("Connected to the WiFi network");
    // connecting to a mqtt broker
    client.setServer(mqtt_broker, mqtt_port);
    client.setCallback(callback);
    while (!client.connected()) {
        String client_id = "esp8266-client-";
        client_id += String(WiFi.macAddress());
        // Serial.printf("The client %s connects to the public mqtt broker\n", client_id.c_str());
        if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
            // Serial.println("Public mqtt broker connected");
        } else {
            // Serial.print("failed with state ");
            // Serial.print(client.state());
            delay(2000);
        }
    }
    // publish and subscribe
    client.publish(topic, "device is online");
    client.subscribe(topic);
}

void callback(char *topic, byte *payload, unsigned int length) {
    char strarr[length];
    for (int i = 0; i < length; i++) {
        strarr[i] = (char) payload[i];
    }
    Serial.println(strarr);
}

void loop() {
    client.loop();
}

A-4. mosquitto-client 傳送控制指令 Publish

root@localhost:~# sudo mosquitto_pub -h io.adafruit.com -p 1883 -u hcyang0207 -P aio_BKwE178y7NDTg4K651********** -t "hcyang0207/feeds/home.control" -m "1.50"
root@localhost:~# sudo mosquitto_pub -h io.adafruit.com -p 1883 -u hcyang0207 -P aio_BKwE178y7NDTg4K651********** -t "hcyang0207/feeds/home.control" -m "1.70"
root@localhost:~# sudo mosquitto_pub -h io.adafruit.com -p 1883 -u hcyang0207 -P aio_BKwE178y7NDTg4K651********** -t "hcyang0207/feeds/home.control" -m "1.20"
root@localhost:~# sudo mosquitto_pub -h io.adafruit.com -p 1883 -u hcyang0207 -P aio_BKwE178y7NDTg4K651********** -t "hcyang0207/feeds/home.control" -m "1.0"
root@localhost:~# sudo mosquitto_pub -h io.adafruit.com -p 1883 -u hcyang0207 -P aio_BKwE178y7NDTg4K651********** -t "hcyang0207/feeds/home.control" -m "2.50"
root@localhost:~# sudo mosquitto_pub -h io.adafruit.com -p 1883 -u hcyang0207 -P aio_BKwE178y7NDTg4K651********** -t "hcyang0207/feeds/home.control" -m "2.100"
root@localhost:~# sudo mosquitto_pub -h io.adafruit.com -p 1883 -u hcyang0207 -P aio_BKwE178y7NDTg4K651********** -t "hcyang0207/feeds/home.control" -m "2.0"

A-5. Arduino Pro Mini 整流器端(加熱端)

#include <TimerOne.h>

const byte pin = 5;                    // TRIAC 訊號輸出接腳
const byte trigPin = 3;                // TRIAC PIN 只能用pin2或3
volatile boolean zeroCross = false;    // 目前trig狀態(儲存零交越狀態的變數)
float dim = 64;  
int i = 0;
float dim_tmp = 0;
String str = "";                       // 暫存輸入字串的變數
char chr;
int val;
String str_check = "2.";               // 控制組標頭(1 = 加熱, 2 = 降溫)
boolean str_flag = false;

void setup() {
    pinMode(pin, OUTPUT);
    pinMode(trigPin, INPUT_PULLUP);
    attachInterrupt(digitalPinToInterrupt(trigPin), zeroCrossISR, RISING);
    Serial.begin(9600);
    Timer1.initialize(65);    // 設定讓定時器每隔65微秒，自動執行dim_check函數。
    Timer1.attachInterrupt(dim_check);
}

void zeroCrossISR() {
    zeroCross = true;      
    i=0;
    digitalWrite(pin, LOW);  // 關閉電源TRIAC
    dim = dim_tmp;
}

void dim_check() {
    if (zeroCross) {                    // 若已經過零交越點....
        if (i > 127 - dim) {            // 判斷是否過了延遲觸發時間...
            digitalWrite(pin, HIGH);    // 開啟TRIAC
            i = 0;                      // 重設「計數器」
            zeroCross = false;          // 零交越 flag
        } else {
            i++;
        }
    }
}

void loop() {
    while (Serial.available() > 0) {
        char chr = Serial.read();
        if (chr != '\n'){
            str += chr;         // 把字元連結成字串
        } else if(str != NULL) {
            for(int i=0;i<2;i++) {
                if(str[i]!=str_check[i]) {
                    Serial.print("Input data: ");
                    dim_tmp = 0;
                    Serial.println(dim_tmp);
                    break;
                }
                if(i == 1) {
                    str_flag == true;   
                    str.remove(0,2);
                    Serial.print("Input data: ");
                    if(str.toInt() <= 100 && str.toInt() >= 0 && str != " " ) {
                        Serial.println(str.toInt());   // 將字串轉換成數字
                        dim_tmp = str.toInt();
                        dim_tmp = (dim_tmp/100)*128-1;
                        str_flag = false;
                    }
                }
            }
            if(str_flag == true) {}
            str = "";
        }
    }
}