资源简介
dht11头文件,'dht11.h','dht11.cpp'.包含一个温度湿度实例
代码片段和文件信息
//
// FILE: dht11.cpp
// VERSION: 0.4.1
// PURPOSE: DHT11 Temperature & Humidity Sensor library for Arduino
// LICENSE: GPL v3 (http://www.gnu.org/licenses/gpl.html)
//
// DATASHEET: http://www.micro4you.com/files/sensor/DHT11.pdf
//
// HISTORY:
// George Hadjikyriacou - Original version (??)
// Mod by SimKard - Version 0.2 (24/11/2010)
// Mod by Rob Tillaart - Version 0.3 (28/03/2011)
// + added comments
// + removed all non DHT11 specific code
// + added references
// Mod by Rob Tillaart - Version 0.4 (17/03/2012)
// + added 1.0 support
// Mod by Rob Tillaart - Version 0.4.1 (19/05/2012)
// + added error codes
//
#include “dht11.h“
// Return values:
// DHTLIB_OK
// DHTLIB_ERROR_CHECKSUM
// DHTLIB_ERROR_TIMEOUT
int dht11::read(int pin)
{
// BUFFER TO RECEIVE
uint8_t bits[5];
uint8_t cnt = 7;
uint8_t idx = 0;
// EMPTY BUFFER
for (int i=0; i< 5; i++) bits[i] = 0;
// REQUEST SAMPLE
pinMode(pin OUTPUT);
digitalWrite(pin LOW);
delay(18);
digitalWrite(pin HIGH);
delayMicroseconds(40);
pinMode(pin INPUT);
// ACKNOWLEDGE or TIMEOUT
unsigned int loopCnt = 10000;
while(digitalRead(pin) == LOW)
if (loopCnt-- == 0) return DHTLIB_ERROR_TIMEOUT;
loopCnt = 10000;
while(digitalRead(pin) == HIGH)
if (loopCnt-- == 0) return DHTLIB_ERROR_TIMEOUT;
// READ OUTPUT - 40 BITS => 5 BYTES or TIMEOUT
for (int i=0; i<40; i++)
{
loopCnt = 10000;
while(digitalRead(pin) == LOW)
if (loopCnt-- == 0) return DHTLIB_ERROR_TIMEOUT;
unsigned long t = micros();
loopCnt = 10000;
while(digitalRead(pin) == HIGH)
if (loopCnt-- == 0) return DHTLIB_ERROR_TIMEOUT;
if ((micros() - t) > 40) bits[idx] |= (1 << cnt);
if (cnt == 0) // next byte?
{
cnt = 7; // restart at MSB
idx++; // next byte!
}
else cnt--;
}
// WRITE TO RIGHT VARS
// as bits[1] and bits[3] are allways zero they are omitted in formulas.
humidity = bits[0];
temperature = bits[2]+bits[3]; //bits[3]是温度的小数部分
uint8_t sum = bits[0] +bits[1]+ bits[2]+bits[3]; //校验码的正确计算方法,旧版本的bits[1]和bits[3]是0可以不加,新的是有小数的 必须加上否则不对 if (bits[4] != sum) return DHTLIB_ERROR_CHECKSUM;
return DHTLIB_OK;
}
//
// END OF FILE
//
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 2333 2018-06-27 18:54 Dht11\dht11.cpp
文件 392 2018-06-27 18:54 Dht11\dht11.h
文件 2474 2018-06-27 18:54 Dht11\examples\dht11\dht11.ino
目录 0 2018-06-27 18:51 Dht11\examples\dht11
目录 0 2018-06-27 18:51 Dht11\examples
目录 0 2018-06-27 18:51 Dht11
----------- --------- ---------- ----- ----
5199 6
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