Fork
Dependents: DHT11_and_DHT22_MbedOS5_Example
DHT.h
- Committer:
- Daniel_Lee
- Date:
- 2019-11-08
- Revision:
- 5:cd2c41384ab8
- Parent:
- 4:1b4e37ce64f8
File content as of revision 5:cd2c41384ab8:
/* * 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" typedef enum { DHT11 = 11, SEN11301P = 11, RHT01 = 11, DHT22 = 22, AM2302 = 22, SEN51035P = 22, RHT02 = 22, RHT03 = 22 }eType; typedef enum { ERROR_NONE = 0, BUS_BUSY, ERROR_NOT_PRESENT, ERROR_ACK_TOO_LONG, ERROR_SYNC_TIMEOUT, ERROR_DATA_TIMEOUT, ERROR_CHECKSUM, ERROR_NO_PATIENCE }eError; typedef enum { CELCIUS = 0, FARENHEIT, KELVIN }eScale; class DHT { public: DHT(PinName pin, eType DHTtype); ~DHT(); eError readData(void); float ReadHumidity(void); float ReadTemperature(eScale const Scale); float CalcdewPoint(float const celsius, float const humidity); float CalcdewPointFast(float const celsius, float const humidity); private: time_t _lastReadTime; float _lastTemperature; float _lastHumidity; PinName _pin; bool _firsttime; eType _DHTtype; uint8_t DHT_data[5]; float CalcTemperature(); float CalcHumidity(); float ConvertCelciustoFarenheit(float const); float ConvertCelciustoKelvin(float const); eError stall(DigitalInOut &io, int const level, int const max_time); }; #endif