以下是完整代码，注释已经说明了每一步操作：
```c
++
#include <
DHT.h>
#include <WiFi
.h>
#include <WiFiClientSecure
.h>
#include <PubSubClient
.h>
#include <Wire
.h>
#include <Adafruit_GFX
.h>
#include <Adafruit_SSD13
06
.h>
#include <Aliyun
IoTSDK
.h>
// WiFi连接信息
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
// 阿里云物联网平台参数
const char* productKey = "your_PRODUCT_KEY";
const char* deviceName1 = "your_DEVICE_NAME1";
const char* deviceSecret1 = "your_DEVICE_SECRET1";
const char* deviceName2 = "your_DEVICE_NAME2";
const char* deviceSecret2 = "your_DEVICE_SECRET2";
const char* region = "cn-shanghai";
const char* broker = "tcp://your_PRODUCT_KEY
.iot-as-
mqtt.cn-shanghai
.aliyuncs
.com:1883";
const char* subTopic = "/sys/"
+ String
(productKey
) + "/"
+ String
(deviceName1
) + "/thing/event/property/post";
const char* pubTopic1 = "/sys/"
+ String
(productKey
) + "/"
+ String
(deviceName1
) + "/thing/event/property/post";
const char* pubTopic2 = "/sys/"
+ String
(productKey
) + "/"
+ String
(deviceName2
) + "/thing/event/property/post";
//
DHT传感器信息
#define
DHTPIN1 2 // 第一个传感器接口
#define
DHTPIN2 4 // 第
二个传感器接口
#define
DHTTYPE
DHT11 //
DHT11传感器类型
DHT dht1
(DHTPIN1,
DHTTYPE
);
DHT dht2
(DHTPIN2,
DHTTYPE
);
float temperature1, humidity1, temperature2, humidity2;
//
OLED显示屏信息
#define SCREEN_WIDTH 128 //
OLED显示屏宽度
#define SCREEN_HEIGHT 64 //
OLED显示屏高度
#define
OLED_RESET -1 //
OLED重置引脚
Adafruit_SSD13
06 display
(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire,
OLED_RESET
);
// 阿里云物联网平台参数
Aliyun
IoTSDK
iot;
// WiFi客户端
和MQTT客户端
WiFiClientSecure wifiClient;
PubSubClient
mqttClient
(wifiClient
);
// WiFi连接函数
void connectWiFi
() {
Serial
.print
("Connecting to "
);
Serial
.println
(ssid
);
WiFi
.begin
(ssid, password
);
while
(WiFi
.status
() != WL_CONNECTED
) {
delay
(1
000);
Serial
.println
("Connecting to WiFi
..."
);
}
Serial
.println
("Connected to WiFi"
);
}
//
MQTT连接函数
void connect
MQTT() {
mqttClient
.setServer
(broker, 1883
);
while
(!
mqttClient
.connected
()) {
Serial
.println
("Connecting to
MQTT broker
..."
);
String clientId = "
ESP8266Client-"
+ String
(random
(0xffff
), HEX
);
if
(mqttClient
.connect
(clientId
.c_str
(), deviceName1, deviceSecret1
)) {
Serial
.println
("
MQTT broker connected"
);
mqttClient
.subscribe
(subTopic
);
} else {
Serial
.print
("
MQTT broker connection failed, rc="
);
Serial
.print
(mqttClient
.state
());
Serial
.println
(" try again in 5 seconds"
);
delay
(5
000);
}
}
}
//
OLED显示函数
void displayData
() {
display
.clearDisplay
();
display
.setTextSize
(1
);
display
.setTextColor
(WHITE
);
display
.setCursor
(0,
0);
display
.println
("Device 1:"
);
display
.print
("Temperature: "
);
display
.print
(temperature1
);
display
.println
("C"
);
display
.print
("Humidity: "
);
display
.print
(humidity1
);
display
.println
("%"
);
display
.println
();
display
.println
("Device 2:"
);
display
.print
("Temperature: "
);
display
.print
(temperature2
);
display
.println
("C"
);
display
.print
("Humidity: "
);
display
.print
(humidity2
);
display
.println
("%"
);
display
.display
();
}
// 阿里云物联网平台上报函数
void reportData
() {
Serial
.println
("Reporting data
..."
);
String payload = "{\"id\":\"1\",\"params\":{\"Temperature\":"
+ String
(temperature1
) + ",\"Humidity\":"
+ String
(humidity1
) + "},\"method\":\"thing
.event
.property
.post\"}";
mqttClient
.publish
(pubTopic1, payload
.c_str
());
payload = "{\"id\":\"1\",\"params\":{\"Temperature\":"
+ String
(temperature2
) + ",\"Humidity\":"
+ String
(humidity2
) + "},\"method\":\"thing
.event
.property
.post\"}";
mqttClient
.publish
(pubTopic2, payload
.c_str
());
}
void setup
() {
Serial
.begin
(9600);
//
OLED显示屏初始化
if
(!display
.begin
(SSD13
06_SWITCHCAPVCC,
0x3C
)) {
Serial
.println
("SSD13
06 initialization failed"
);
while
(true
);
}
display
.display
();
delay
(2
000);
display
.clearDisplay
();
//
DHT传感器初始化
dht1
.begin
();
dht2
.begin
();
// WiFi连接
connectWiFi
();
// 阿里云物联网平台初始化
iot.begin
(region, productKey, deviceName1, deviceSecret1
);
wifiClient
.setCACert
(iot.getCACert
());
wifiClient
.setCertificate
(iot.getCertificate
());
wifiClient
.setPrivateKey
(iot.getPrivateKey
());
//
MQTT连接
connect
MQTT();
}
void loop
() {
// 读取传感器数据
humidity1 =
dht1
.readHumidity
();
temperature1 =
dht1
.readTemperature
();
humidity2 =
dht2
.readHumidity
();
temperature2 =
dht2
.readTemperature
();
// 如果读取失败，则重试
if
(isnan
(humidity1
) || isnan
(temperature1
) || isnan
(humidity2
) || isnan
(temperature2
)) {
Serial
.println
("Failed to read sensor data"
);
delay
(1
000);
return;
}
// 将数据打印到串口
和OLED显示屏
Serial
.print
("Device 1 - Temperature: "
);
Serial
.print
(temperature1
);
Serial
.print
("C, Humidity: "
);
Serial
.print
(humidity1
);
Serial
.println
("%"
);
Serial
.print
("Device 2 - Temperature: "
);
Serial
.print
(temperature2
);
Serial
.print
("C, Humidity: "
);
Serial
.print
(humidity2
);
Serial
.println
("%"
);
displayData
();
// 上报数据到阿里云物联网平台
reportData
();
// 每隔一秒刷新数据
和OLED显示屏
delay
(1
000);
}
```
需要注意的几点：
1
. 代码中使用了两个
DHT11传感器，分别连接在D4
和D7引脚上，可以根据实际情况修改。
2
. OLED显示屏使用了SSD13
06驱动，连接在D1
和D2引脚上，可以根据实际情况修改。
3
. 需要将WiFi连接信息、阿里云物联网平台参数、
DHT传感器信息等修改为实际情况。
4
. 代码中使用了阿里云物联网平台的SDK，需要在
Arduino IDE中安装Aliyun
IoTSDK
库。
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