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接线：
数字信号接模拟输入A0
Arduino示例代码：
| xxxxxxxxxx98 1#define dht_dpin A0 // 设定A0为模拟输入接口(a0-a5)2byte bGlobalErr;3byte dht_dat[5];45void setup(){6InitDHT();7Serial.begin(9600);8delay(300);9Serial.println("Humidity and temperature\n\n");10delay(700);11}1213void loop(){14 ReadDHT();15 switch (bGlobalErr){ //获取数据后，开始打印16 case 0:17 Serial.print("Current humdity = ");18 Serial.print(dht_dat[0], DEC);19 Serial.print(".");20 Serial.print(dht_dat[1], DEC);21 Serial.print("% ");22 Serial.print("temperature = ");23 Serial.print(dht_dat[2], DEC);24 Serial.print(".");25 Serial.print(dht_dat[3], DEC);26 Serial.println("C ");27 break;28 case 1:29 Serial.println("Error 1: DHT start condition 1 not met.");30 break;31 case 2:32 Serial.println("Error 2: DHT start condition 2 not met.");33 break;34 case 3:35 Serial.println("Error 3: DHT checksum error.");36 break;37 default:38 Serial.println("Error: Unrecognized code encountered.");39 break;40 }41 delay(800);42}4344void InitDHT(){45 pinMode(dht_dpin,OUTPUT);46 digitalWrite(dht_dpin,HIGH);47}4849void ReadDHT(){50bGlobalErr=0;51byte dht_in;52byte i;53digitalWrite(dht_dpin,LOW);54delay(20);5556digitalWrite(dht_dpin,HIGH);57delayMicroseconds(40);58pinMode(dht_dpin,INPUT);59//delayMicroseconds(40);60dht_in=digitalRead(dht_dpin);6162if(dht_in){63 bGlobalErr=1;64 return;65 }66delayMicroseconds(80);67dht_in=digitalRead(dht_dpin);6869if(!dht_in){70 bGlobalErr=2;71 return;72 }73delayMicroseconds(80);74for (i=0; i<5; i++)75 dht_dat[i] = read_dht_dat();76pinMode(dht_dpin,OUTPUT);77digitalWrite(dht_dpin,HIGH);78byte dht_check_sum =79 dht_dat[0]+dht_dat[1]+dht_dat[2]+dht_dat[3];80if(dht_dat[4]!= dht_check_sum)81 {bGlobalErr=3;}82};8384byte read_dht_dat(){85 byte i = 0;86 byte result=0;87 for(i=0; i< 8; i++){88 while(digitalRead(dht_dpin)==LOW);89 delayMicroseconds(30);90 if (digitalRead(dht_dpin)==HIGH)91 result |=(1<<(7-i));92 while (digitalRead(dht_dpin)==HIGH);93 }94 return result;95}969798
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