接上一篇博客，这次还是关于 esp8266 --> 物联网

一、云端数据监控：DHT11 + NodeMcu +Dweet.io

接上一篇博客的接线及相关配置不变( DHT11 + NodeMcu )
配置 Dweet.io

Dweet.io 是一个可以通过非常简易的方式为物联网设备提供通信服务（包括报警等）的云端平台。它不需要任何的设置或注册步骤，只要终端设备连接上互联网，即可直接发布或订阅数据。

通过 Dweet.io 提供的云端服务，可以很方便的将传感器数据发布到在线平台并实时地进行远程监控。

Dweeting(发送数据到云端)
- 调用URL: https://dweet.io/dweet/for/my-thing-name?hello=world&foo=bar
Get Dweeting
- 获取最新发布的 dweet : https://dweet.io/get/latest/dweet/for/my-thing-name
- 获取某个名字下所有的 dweets : https://dweet.io/get/dweets/for/my-thing-name

$ http -b "https://dweet.io/get/dweets/for/rollingstarky"

{

    "by": "getting",

    "the": "dweets",

    "this": "succeeded",

    "with": [

        {

            "content": {

                "foo": "bar",

                "hello": "world"

            },

            "created": "2020-09-25T16:30:34.524Z",

            "thing": "rollingstarky"

        },

        {

            "content": {

                "foo": "bar",

                "hello": "world"

            },

            "created": "2020-09-25T16:10:46.694Z",

            "thing": "rollingstarky"

        }

    ]

}

项目代码

把上篇博客的数据传送到 Dweet.io 云端平台

#include <ESP8266WiFi.h>

#include "DHT.h"

// WiFi parameters

const char* ssid = "wifi-name";

const char* password = "wifi-password";

#define DHTPIN 5

#define DHTTYPE DHT11

// Initialize DHT sensor

DHT dht(DHTPIN, DHTTYPE, 15);

const char* host = "dweet.io";

void setup() {

  Serial.begin(115200);

  delay(10);

  dht.begin();

  // Connecting to a WiFi network

  Serial.println();

  Serial.println();

  Serial.print("Connecting to ");

  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  Serial.println("");

  Serial.println("WiFi connected");

  Serial.println("IP address: ");

  Serial.println(WiFi.localIP());

}

void loop() {

  Serial.print("Connecting to ");

  Serial.println(host);

  // Use WiFiClient class to create TCP connections

  WiFiClient client;

  const int httpPort = 80;

  if (!client.connect(host, httpPort)) {

    Serial.println("connection failed");

    return;

  }

  // Reading temperature and humidity

  float h = dht.readHumidity();

  float t = dht.readTemperature();

  while (isnan(h) || isnan(t)) {

    Serial.println("Failed to read from DHT sensor!");

    delay(2000);

    // Get the measurements once more

    h = dht.readHumidity();

    t = dht.readTemperature();

  }

    Serial.println();

    Serial.println("The temperature and humidity are:");

    Serial.println(t);

    Serial.println(h);

    // Send the request to the server

    client.print(String("GET /dweet/for/rollingstarkyesp8266?temperature=") + String(t) + "&humidity=" + String(h) + " HTTP/1.1\r\n" +

                 "Host: " + host + "\r\n" +

                 "Connection: close\r\n\r\n");

    unsigned long timeout = millis();

    while (client.available() == 0) {

      if (millis() - timeout > 5000) {

        Serial.println(">>> Client Timeout !");

        client.stop();

        return;

    }

  }

    // Read all the lines of the reply from server and print them to Serial

    while(client.available()){

      String line = client.readStringUntil('\r');

      Serial.print(line);

    }

    Serial.println();

    Serial.println("closing connection");

    Serial.println();

  // Repeat every 10 seconds

  delay(10000);

}

访问最新更新的数据：https://dweet.io/get/latest/dweet/for/rollingstarkyesp8266

{"this":"succeeded","by":"getting","the":"dweets","with":[{"thing":"rollingstarkyesp8266","created":"2020-09-25T09:27:22.823Z","content":{"temperature":28,"humidity":61}}]}

访问全部数据：https://dweet.io/get/dweets/for/rollingstarkyesp8266

{"this":"succeeded","by":"getting","the":"dweets","with":[{"thing":"rollingstarkyesp8266","created":"2020-09-25T09:17:04.292Z","content":{"temperature":27.9,"humidity":58}},{"thing":"rollingstarkyesp8266","created":"2020-09-25T09:15:08.961Z","content":{"temperature":27.9,"humidity":59}},{"thing":"rollingstarkyesp8266","created":"2020-09-25T09:13:16.383Z","content":{"temperature":27.9,"humidity":58}},{"thing":"rollingstarkyesp8266","created":"2020-09-25T09:11:30.363Z","content":{"temperature":27.9,"humidity":57}},{"thing":"rollingstarkyesp8266","created":"2020-09-25T09:09:43.309Z","content":{"temperature":27.9,"humidity":57}}]}

访问可视化图表：http://dweet.io/follow/rollingstarkyesp8266
- 这里有点见鬼，出不来，单数据应该是都到云端了，可以查到 Json 数据（假装有图有真相）

链接 freeboard 平台（仪表盘）

注册
懂点英语，稍微摸索一下

二、远程控制物联网设备：NodeMcu + PubSubClient + aREST

1.准备工具

aREST 库

aREST 框架可以为一些常见的嵌入式开发板提供 RESTful 接口，支持通过串口、Wi-Fi、以太网、蓝牙等硬件发送命令至开发板，激发特定的操作，并将数据以 JSON 的格式返回给控制端用户

PubSubClient 库

源代码

// Import required libraries

#include <ESP8266WiFi.h>

#include <PubSubClient.h>

#include <aREST.h>

// Clients

WiFiClient espClient;

PubSubClient client(espClient);

// Create aREST instance

aREST rest = aREST(client);

// Unique ID to identify the device for cloud.arest.io

char* device_id = "wuwu380";

// WiFi parameters

const char* ssid = "wifi-name";

const char* password = "wifi-password";

// Callback functions

void callback(char* topic, byte* payload, unsigned int length);

void setup(void)

{

  // Start Serial

  Serial.begin(115200);

  // Set callback

  client.setCallback(callback);

  // Give name and ID to device

  rest.set_id(device_id);

  rest.set_name("devices_control");

  // Connect to WiFi

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  Serial.println("");

  Serial.println("WiFi connected");

  // Set output topic

  char* out_topic = rest.get_topic();

}

void loop() {

  // Connect to the cloud

  rest.handle(client);

}

// Handles message arrived on subscribed topic(s)

void callback(char* topic, byte* payload, unsigned int length) {

  rest.handle_callback(client, topic, payload, length);

}

运行结果

$ http -b https://cloud.arest.io/wuwu380/name

{

"connected": true,

"hardware": "esp8266",

"id": "wuwu380",

"name": "devices_control",

"variables": {}

}

$ http -b https://cloud.arest.io/wuwu380/mode/5/o

{

"connected": true,

"hardware": "esp8266",

"id": "wuwu380",

"message": "Pin D5 set to output",

"name": "devices_control"

}

$ http -b https://cloud.arest.io/wuwu380/digital/5/1

{

"connected": true,

"hardware": "esp8266",

"id": "wuwu380",

"message": "Pin D5 set to 1",

"name": "devices_control"

}

三、 esp8266 连接 OLED 屏，制作天气时钟

我一开始就想做这个了，一开始当成终极目标，现在看看，九折水瓶

必要组件

U8G2 屏幕驱动库
可以去 Ardunio 下载，也可以把 U8g2.rar 解压到 libraries 文件夹

接线

| OLED | NodeMcu |

| : - : | : - : |

| GND | GND |

| VCC | 3V3/5V |

| SCL | D1 |

| SDA | D2 |

载入程序

文件 - 示例 - U8G2 - full_buffer - 任意打开一个，去除下行代码的注释

U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE); // All Boards without Reset of the Display

写入程序

一切的学习，都是从 hello world 开始的[Doge]

巴特西

利用 esp8266 搭建简单物联网项目

一、云端数据监控：DHT11 + NodeMcu +Dweet.io

二、远程控制物联网设备：NodeMcu + PubSubClient + aREST

三、 esp8266 连接 OLED 屏，制作天气时钟

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