Luis Amell / DHT-2

Temp and Humidity sensor device driver. had to fork under a new name, don't know why yet.

Dependents:   Wio-example-SORACOM-Harvest

DHT.h@5:28eb2ec7c6d6, 2019-02-21 (annotated)

Committer:
lamell
Date:
Thu Feb 21 13:03:47 2019 -0400
Revision:
5:28eb2ec7c6d6
Parent:
2:df22ddf10d75
Child:
6:49350e4b126d
No change

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sam_grove 2:df22ddf10d75 1 /*
sam_grove 2:df22ddf10d75 2 * DHT Library for Digital-output Humidity and Temperature sensors
sam_grove 2:df22ddf10d75 3 *
Wimpie 0:9b5b3200688f 4 * Works with DHT11, DHT21, DHT22
Wimpie 0:9b5b3200688f 5 * SEN11301P, Grove - Temperature&Humidity Sensor (Seeed Studio)
Wimpie 0:9b5b3200688f 6 * SEN51035P, Grove - Temperature&Humidity Sensor Pro (Seeed Studio)
sam_grove 2:df22ddf10d75 7 * AM2302 , temperature-humidity sensor
Wimpie 0:9b5b3200688f 8 * RHT01,RHT02, RHT03 , Humidity and Temperature Sensor (Sparkfun)
Wimpie 0:9b5b3200688f 9 *
Wimpie 0:9b5b3200688f 10 * Copyright (C) Wim De Roeve
Wimpie 0:9b5b3200688f 11 * based on DHT22 sensor library by HO WING KIT
Wimpie 0:9b5b3200688f 12 * Arduino DHT11 library
Wimpie 0:9b5b3200688f 13 *
Wimpie 0:9b5b3200688f 14 * Permission is hereby granted, free of charge, to any person obtaining a copy
Wimpie 0:9b5b3200688f 15 * of this software and associated documnetation files (the "Software"), to deal
Wimpie 0:9b5b3200688f 16 * in the Software without restriction, including without limitation the rights
Wimpie 0:9b5b3200688f 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Wimpie 0:9b5b3200688f 18 * copies of the Software, and to permit persons to whom the Software is
Wimpie 0:9b5b3200688f 19 * furished to do so, subject to the following conditions:
Wimpie 0:9b5b3200688f 20 *
Wimpie 0:9b5b3200688f 21 * The above copyright notice and this permission notice shall be included in
Wimpie 0:9b5b3200688f 22 * all copies or substantial portions of the Software.
Wimpie 0:9b5b3200688f 23 *
Wimpie 0:9b5b3200688f 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Wimpie 0:9b5b3200688f 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Wimpie 0:9b5b3200688f 26 * FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Wimpie 0:9b5b3200688f 27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Wimpie 0:9b5b3200688f 28 * LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Wimpie 0:9b5b3200688f 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
Wimpie 0:9b5b3200688f 30 * THE SOFTWARE.
Wimpie 0:9b5b3200688f 31 */
Wimpie 0:9b5b3200688f 32
Wimpie 0:9b5b3200688f 33 #ifndef MBED_DHT_H
Wimpie 0:9b5b3200688f 34 #define MBED_DHT_H
Wimpie 0:9b5b3200688f 35
Wimpie 0:9b5b3200688f 36 #include "mbed.h"
Wimpie 0:9b5b3200688f 37
lamell 5:28eb2ec7c6d6 38 typedef enum eType {
sam_grove 2:df22ddf10d75 39 DHT11 = 11,
sam_grove 2:df22ddf10d75 40 SEN11301P = 11,
sam_grove 2:df22ddf10d75 41 RHT01 = 11,
sam_grove 2:df22ddf10d75 42 DHT22 = 22,
sam_grove 2:df22ddf10d75 43 AM2302 = 22,
sam_grove 2:df22ddf10d75 44 SEN51035P = 22,
sam_grove 2:df22ddf10d75 45 RHT02 = 22,
sam_grove 2:df22ddf10d75 46 RHT03 = 22
lamell 5:28eb2ec7c6d6 47 } eType;
Wimpie 0:9b5b3200688f 48
lamell 5:28eb2ec7c6d6 49 typedef enum eError {
Wimpie 0:9b5b3200688f 50 ERROR_NONE = 0,
sam_grove 2:df22ddf10d75 51 BUS_BUSY,
sam_grove 2:df22ddf10d75 52 ERROR_NOT_PRESENT,
sam_grove 2:df22ddf10d75 53 ERROR_ACK_TOO_LONG,
sam_grove 2:df22ddf10d75 54 ERROR_SYNC_TIMEOUT,
sam_grove 2:df22ddf10d75 55 ERROR_DATA_TIMEOUT,
sam_grove 2:df22ddf10d75 56 ERROR_CHECKSUM,
sam_grove 2:df22ddf10d75 57 ERROR_NO_PATIENCE
lamell 5:28eb2ec7c6d6 58 } eError;
Wimpie 0:9b5b3200688f 59
lamell 5:28eb2ec7c6d6 60 typedef enum eScale {
sam_grove 2:df22ddf10d75 61 CELCIUS = 0,
sam_grove 2:df22ddf10d75 62 FARENHEIT,
sam_grove 2:df22ddf10d75 63 KELVIN
lamell 5:28eb2ec7c6d6 64 } eScale;
Wimpie 0:9b5b3200688f 65
Wimpie 0:9b5b3200688f 66
sam_grove 2:df22ddf10d75 67 class DHT
sam_grove 2:df22ddf10d75 68 {
Wimpie 0:9b5b3200688f 69
Wimpie 0:9b5b3200688f 70 public:
Wimpie 0:9b5b3200688f 71
sam_grove 2:df22ddf10d75 72 DHT(PinName pin, eType DHTtype);
Wimpie 0:9b5b3200688f 73 ~DHT();
sam_grove 2:df22ddf10d75 74 eError readData(void);
Wimpie 0:9b5b3200688f 75 float ReadHumidity(void);
sam_grove 2:df22ddf10d75 76 float ReadTemperature(eScale const Scale);
sam_grove 2:df22ddf10d75 77 float CalcdewPoint(float const celsius, float const humidity);
sam_grove 2:df22ddf10d75 78 float CalcdewPointFast(float const celsius, float const humidity);
Wimpie 0:9b5b3200688f 79
Wimpie 0:9b5b3200688f 80 private:
Wimpie 0:9b5b3200688f 81 time_t _lastReadTime;
Wimpie 0:9b5b3200688f 82 float _lastTemperature;
Wimpie 0:9b5b3200688f 83 float _lastHumidity;
Wimpie 0:9b5b3200688f 84 PinName _pin;
Wimpie 0:9b5b3200688f 85 bool _firsttime;
sam_grove 2:df22ddf10d75 86 eType _DHTtype;
sam_grove 2:df22ddf10d75 87 uint8_t DHT_data[5];
Wimpie 0:9b5b3200688f 88 float CalcTemperature();
Wimpie 0:9b5b3200688f 89 float CalcHumidity();
sam_grove 2:df22ddf10d75 90 float ConvertCelciustoFarenheit(float const);
sam_grove 2:df22ddf10d75 91 float ConvertCelciustoKelvin(float const);
sam_grove 2:df22ddf10d75 92 eError stall(DigitalInOut &io, int const level, int const max_time);
Wimpie 0:9b5b3200688f 93
Wimpie 0:9b5b3200688f 94 };
Wimpie 0:9b5b3200688f 95
Wimpie 0:9b5b3200688f 96 #endif