Fork of DHT repo with checksum fixes.
Fork of DHT by
Diff: DHT.h
- Revision:
- 0:9b5b3200688f
- Child:
- 1:932d451474dc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DHT.h Mon Jul 09 19:47:43 2012 +0000 @@ -0,0 +1,94 @@ +/* + * DHT Library for Digital-output Humidity and Temperature sensors + * + * Works with DHT11, DHT21, DHT22 + * SEN11301P, Grove - Temperature&Humidity Sensor (Seeed Studio) + * SEN51035P, Grove - Temperature&Humidity Sensor Pro (Seeed Studio) + * AM2302 , temperature-humidity sensor + * RHT01,RHT02, RHT03 , Humidity and Temperature Sensor (Sparkfun) + * + * Copyright (C) Wim De Roeve + * based on DHT22 sensor library by HO WING KIT + * Arduino DHT11 library + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documnetation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#ifndef MBED_DHT_H +#define MBED_DHT_H + +#include "mbed.h" + +enum eType{ + DHT11 = 11, + SEN11301P = 11, + RHT01 = 11, + DHT22 = 22, + AM2302 = 22, + SEN51035P = 22, + RHT02 = 22, + RHT03 = 22 + } ; + +enum eError { + ERROR_NONE = 0, + BUS_BUSY =1, + ERROR_NOT_PRESENT =2 , + ERROR_ACK_TOO_LONG =3 , + ERROR_SYNC_TIMEOUT = 4, + ERROR_DATA_TIMEOUT =5 , + ERROR_CHECKSUM = 6, + ERROR_NO_PATIENCE =7 +} ; + +typedef enum { + CELCIUS =0 , + FARENHEIT =1, + KELVIN=2 +} eScale; + + +class DHT { + +public: + + DHT(PinName pin,int DHTtype); + ~DHT(); + int readData(void); + float ReadHumidity(void); + float ReadTemperature(eScale Scale); + float CalcdewPoint(float celsius, float humidity); + float CalcdewPointFast(float celsius, float humidity); + +private: + time_t _lastReadTime; + float _lastTemperature; + float _lastHumidity; + PinName _pin; + bool _firsttime; + int _DHTtype; + int DHT_data[6]; + float CalcTemperature(); + float CalcHumidity(); + float ConvertCelciustoFarenheit(float); + float ConvertCelciustoKelvin(float); + +}; + +#endif