室内检测系统由ESP12E Shield+Arduino UNO R3开发板+DHT11温湿度模块+双色LED灯+有源蜂鸣器+光敏电阻模块+I2CLCD1602液晶显示器所构成。DHT11温湿度模块获取室内温湿度数据通过I2CLCD1602液晶显示器进行显示，另一方面通过ESP12E Shield将数据上传至云平台。光敏电阻进行捕获室内光照强度，若光照强度过弱，即日光过弱，周围环境太黑暗低于设定的阈值，则有源蜂鸣器警报，双色LED灯变红，正常情况下LED灯为绿色。

一、设备准备

Arduino UNO R3

I2CLCD1602液晶显示器

ESP12E Shield

DHT11温湿度模块

有源蜂鸣器

光敏电阻模块

双色LED灯

二、设备连接

ESP12E Shield直接覆盖Arduino UNO R3开发板

DHT11模块

DHT11模块	Arduino UNO R3
+	5V
-	GND
OUT	P2

I2CLCD1602液晶显示器

I2CLCD1602液晶显示器	Arduino UNO R3
GDN	GND
VCC	5V
SDA	A4
SCL	A5

光敏电阻模块

光敏电阻模块	Arduino UNO R3
VCC	5V
GND	GND
AO	A0

有源蜂鸣器

有源蜂鸣器	Arduino UNO R3
GND	GND
I/O	P7
VCC	5V

双色LED灯

双色LED灯	Arduino UNO R3
GND	GND
R	P11
G	P10

三、云平台设置

联网上传至服务器的配置可参考该篇博文
一、Arduino UNO R3将数据上传至云平台
需要添加俩个设备名称分别为humi和temp用于存放温湿度信息

四、完整代码

#include <dht.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h> 
LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 and 0x3F for a 16 chars and 2 line displaydht DHT;//create a variable type of dhtconst int DHT11_PIN= 2;//Humiture sensor attach to pin2const int greenPin = 11;  // R petal on RGB LED module connected to digital pin 11 
const int redPin= 10;  // G petal on RGB LED module connected to digital pin 10 const int photocellPin = A0; //photoresistor module attach to A0
int outputValue = 0;
const int buzzerPin=7;  //buzzer attach to digital 7
int val = 0; 
int wendu=0;
int shidu=0;
void setup()
{Serial.begin(9600);randomSeed(analogRead(0));pinMode(buzzerPin,OUTPUT);pinMode(redPin, OUTPUT); //set redPin as OUTPUTpinMode(greenPin, OUTPUT);//set greenPin as OUTPUTlcd.init();  //initialize the lcdlcd.backlight();  //open the backlight 
}void loop()
{// READ DATA//Serial.println("DHT11:");D: int chk = DHT.read11(DHT11_PIN);//read the value returned from sensorswitch (chk){case DHTLIB_OK:  //Serial.println("OK!"); break;case DHTLIB_ERROR_CHECKSUM: //goto D;//Serial.print("Checksum error,\t"); break;case DHTLIB_ERROR_TIMEOUT: //goto D;//Serial.print("Time out error,\t"); break;default: // goto D;//Serial.print("Unknown error,\t"); break;}// DISPLAY DATAlcd.setCursor(0, 0);lcd.print("Tem:");//Serial.print("Tem:");lcd.print(DHT.temperature,1); //print the temperature on lcd wendu = DHT.temperature;
/*Serial.print("wendu:");Serial.print(wendu);Serial.print("\n");
*/Serial.print("cmd=upload&device_name=temp&data=");Serial.print(wendu);//send a random numberSerial.println("&uid=beyondyy&key=6d2cc6e3e19efa259a302fcf4166e2ce");lcd.print(char(223));//print the unit" ℃ "lcd.print("C");// Serial.println(" C");lcd.setCursor(0, 1);lcd.print("Hum:");//Serial.print("Hum:");lcd.print(DHT.humidity,1); //print the humidity on lcdshidu = DHT.humidity;/*Serial.print("shidu:");Serial.print(shidu);Serial.print("\n");*/Serial.print("cmd=upload&device_name=humi&data=");Serial.print(shidu);//send a random numberSerial.println("&uid=beyondyy&key=6d2cc6e3e19efa259a302fcf4166e2ce");lcd.print(" %"); //Serial.println(" %");delay(200); //wait a while outputValue = analogRead(photocellPin);//read the value of photoresistor//Serial.println(outputValue); //print it in serial monitorif(outputValue >= 500) //else{digitalWrite(buzzerPin,LOW);analogWrite(redPin, 255); //red value decreaseanalogWrite(greenPin, 0); //green value decreasedelay(100);//Serial.println(val, DEC);}else{digitalWrite(buzzerPin,HIGH);analogWrite(greenPin, 255); //green value decreaseanalogWrite(redPin, 0); //red value decreasedelay(100);}delay(1000); //delay 1s}

所需库下载连接
将下载好的压缩包解压，把文件Dht复制到你的编译器Arduino的libraries文件夹下

五、视频效果演示

视频链接CSDN
视频链接B站