室內檢測系統由ESP12E Shield+Arduino UNO R3開發板+DHT11溫濕度模塊+雙色LED燈+有源蜂鳴器+光敏電阻模塊+I2CLCD1602液晶顯示器所構成。DHT11溫濕度模塊獲取室內溫濕度數據通過I2CLCD1602液晶顯示器進行顯示，另一方面通過ESP12E Shield將數據上傳至云平臺。光敏電阻進行捕獲室內光照強度，若光照強度過弱，即日光過弱，周圍環境太黑暗低于設定的閾值，則有源蜂鳴器警報，雙色LED燈變紅，正常情況下LED燈為綠色。

一、設備準備

Arduino UNO R3

I2CLCD1602液晶顯示器

ESP12E Shield

DHT11溫濕度模塊

有源蜂鳴器

光敏電阻模塊

雙色LED燈

二、設備連接

ESP12E Shield直接覆蓋Arduino UNO R3開發板

DHT11模塊

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

I2CLCD1602液晶顯示器

I2CLCD1602液晶顯示器	Arduino UNO R3
GDN	GND
VCC	5V
SDA	A4
SCL	A5

光敏電阻模塊

光敏電阻模塊	Arduino UNO R3
VCC	5V
GND	GND
AO	A0

有源蜂鳴器

有源蜂鳴器	Arduino UNO R3
GND	GND
I/O	P7
VCC	5V

雙色LED燈

雙色LED燈	Arduino UNO R3
GND	GND
R	P11
G	P10

三、云平臺設置

聯網上傳至服務器的配置可參考該篇博文
一、Arduino UNO R3將數據上傳至云平臺
需要添加倆個設備名稱分別為humi和temp用于存放溫濕度信息

四、完整代碼

#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}

所需庫下載連接
將下載好的壓縮包解壓，把文件Dht復制到你的編譯器Arduino的libraries文件夾下

五、視頻效果演示

視頻鏈接CSDN
視頻鏈接B站