Arduino源程序:
- #define DHT11_PIN 0
- int Led = 8;
- int Buzzer = 7;
- byte read_dht11_dat()
- {
- byte i = 0;
- byte result = 0;
- for (i = 0; i<8; i++)
- {
- while (!(PINC&_BV(DHT11_PIN)));
- delayMicroseconds(30);
- if (PINC&_BV(DHT11_PIN))
- result |= (1 << (7 - i));
- while ((PINC&_BV(DHT11_PIN)));
- }
- return result;
- }
- void setup()
- {
- DDRC |= _BV(DHT11_PIN);
- PORTC |= _BV(DHT11_PIN);
- pinMode(Led, OUTPUT);
- pinMode(Buzzer, OUTPUT);
- Serial.begin(19200);
- Serial.println("Ready");
- }
- void loop()
- {
- byte dht11_dat[5];
- byte dht11_in;
- byte i;
- PORTC &= ~_BV(DHT11_PIN);
- delay(18);
- PORTC |= _BV(DHT11_PIN);
- delayMicroseconds(40);
- DDRC &= ~_BV(DHT11_PIN);
- delayMicroseconds(40);
- dht11_in = PINC & _BV(DHT11_PIN);
- if (dht11_in)
- {
- Serial.println("dht11 start condition 1 not met");
- return;
- }
- delayMicroseconds(80);
- dht11_in = PINC & _BV(DHT11_PIN);
- if (!dht11_in)
- {
- Serial.println("dht11 start condition 2 not met");
- return;
- }
- delayMicroseconds(80);
- for (i = 0; i<5; i++)
- dht11_dat[i] = read_dht11_dat();
- DDRC |= _BV(DHT11_PIN);
- PORTC |= _BV(DHT11_PIN);
- byte dht11_check_sum = dht11_dat[0] + dht11_dat[1] + dht11_dat[2] + dht11_dat[3];
- if (dht11_dat[4] != dht11_check_sum)
- {
- Serial.println("DHT11 checksum error");
- }
- Serial.print("Current humdity= ");
- Serial.print(dht11_dat[0], DEC);
- Serial.print(".");
- Serial.print(dht11_dat[1], DEC);
- Serial.print("%");
- Serial.print("temperature = ");
- Serial.print(dht11_dat[2], DEC);
- Serial.print(".");
- Serial.print(dht11_dat[3], DEC);
- Serial.println("C");
- if (dht11_dat[0] == 25)
- digitalWrite(Led, HIGH);
- else
- digitalWrite(Led, LOW);
- if (dht11_dat[0] == 28)
- digitalWrite(Buzzer, LOW);
- else
- digitalWrite(Buzzer, HIGH);
- delay(2000);
- }
全部资料51hei下载地址：
arduino控制的DHT11温湿度传感器程序.zip
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