lora dht22
Fork of DHT22 by
DHT22.h@1:5ba30e683313, 2017-01-19 (annotated)
- Committer:
- misadows
- Date:
- Thu Jan 19 12:01:22 2017 +0000
- Revision:
- 1:5ba30e683313
- Parent:
- 0:42ffca439fcc
a
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
crazystick | 0:42ffca439fcc | 1 | /* mbed DHT22 Library |
crazystick | 0:42ffca439fcc | 2 | * Copyright (c) 2011, sford, http://mbed.org |
crazystick | 0:42ffca439fcc | 3 | * |
crazystick | 0:42ffca439fcc | 4 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
crazystick | 0:42ffca439fcc | 5 | * of this software and associated documnetation files (the "Software"), to deal |
crazystick | 0:42ffca439fcc | 6 | * in the Software without restriction, including without limitation the rights |
crazystick | 0:42ffca439fcc | 7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
crazystick | 0:42ffca439fcc | 8 | * copies of the Software, and to permit persons to whom the Software is |
crazystick | 0:42ffca439fcc | 9 | * furished to do so, subject to the following conditions: |
crazystick | 0:42ffca439fcc | 10 | * |
crazystick | 0:42ffca439fcc | 11 | * The above copyright notice and this permission notice shall be included in |
crazystick | 0:42ffca439fcc | 12 | * all copies or substantial portions of the Software. |
crazystick | 0:42ffca439fcc | 13 | * |
crazystick | 0:42ffca439fcc | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
crazystick | 0:42ffca439fcc | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
crazystick | 0:42ffca439fcc | 16 | * FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
crazystick | 0:42ffca439fcc | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
crazystick | 0:42ffca439fcc | 18 | * LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
crazystick | 0:42ffca439fcc | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
crazystick | 0:42ffca439fcc | 20 | * THE SOFTWARE. |
crazystick | 0:42ffca439fcc | 21 | */ |
crazystick | 0:42ffca439fcc | 22 | |
crazystick | 0:42ffca439fcc | 23 | #ifndef MBED_DHT22_H |
crazystick | 0:42ffca439fcc | 24 | #define MBED_DHT22_H |
crazystick | 0:42ffca439fcc | 25 | |
crazystick | 0:42ffca439fcc | 26 | #include "mbed.h" |
crazystick | 0:42ffca439fcc | 27 | |
crazystick | 0:42ffca439fcc | 28 | /** |
crazystick | 0:42ffca439fcc | 29 | * Currently supports DHT22 (SparkFun Electronics) |
crazystick | 0:42ffca439fcc | 30 | * Humidity and Temperature Sensor |
crazystick | 0:42ffca439fcc | 31 | * |
crazystick | 0:42ffca439fcc | 32 | * Features: |
crazystick | 0:42ffca439fcc | 33 | * > 3.3-6V Input |
crazystick | 0:42ffca439fcc | 34 | * > 1-1.5mA measuring current |
crazystick | 0:42ffca439fcc | 35 | * > 40-50uA standby current |
crazystick | 0:42ffca439fcc | 36 | * > Humidity from 0-100% RH |
crazystick | 0:42ffca439fcc | 37 | * > -40 - 80 degrees C temperature range |
crazystick | 0:42ffca439fcc | 38 | * > +-2% RH accuracy |
crazystick | 0:42ffca439fcc | 39 | * > +-0.5 degrees C |
crazystick | 0:42ffca439fcc | 40 | * |
crazystick | 0:42ffca439fcc | 41 | * Usages |
crazystick | 0:42ffca439fcc | 42 | * #include "DHT22.h" |
crazystick | 0:42ffca439fcc | 43 | * |
crazystick | 0:42ffca439fcc | 44 | * DTH22 dth22(PinName sda, PinName scl, int addr); // pin |
crazystick | 0:42ffca439fcc | 45 | * |
crazystick | 0:42ffca439fcc | 46 | * int main() { |
crazystick | 0:42ffca439fcc | 47 | * err=dth22.readData(); |
crazystick | 0:42ffca439fcc | 48 | * if (err==0) { |
crazystick | 0:42ffca439fcc | 49 | printf("Temperature is %f.2 C\n",dht22.getTemperature()); |
crazystick | 0:42ffca439fcc | 50 | printf("Humidity is %f.2 \%\n",dht22.getHumidity()); |
crazystick | 0:42ffca439fcc | 51 | } |
crazystick | 0:42ffca439fcc | 52 | * |
crazystick | 0:42ffca439fcc | 53 | * |
crazystick | 0:42ffca439fcc | 54 | */ |
crazystick | 0:42ffca439fcc | 55 | |
crazystick | 0:42ffca439fcc | 56 | #define DHT22_ERROR_VALUE -99.5 |
crazystick | 0:42ffca439fcc | 57 | |
crazystick | 0:42ffca439fcc | 58 | typedef enum { |
crazystick | 0:42ffca439fcc | 59 | DHT_ERROR_NONE = 0, |
crazystick | 0:42ffca439fcc | 60 | DHT_BUS_HUNG, |
crazystick | 0:42ffca439fcc | 61 | DHT_ERROR_NOT_PRESENT, |
crazystick | 0:42ffca439fcc | 62 | DHT_ERROR_ACK_TOO_LONG, |
crazystick | 0:42ffca439fcc | 63 | DHT_ERROR_SYNC_TIMEOUT, |
crazystick | 0:42ffca439fcc | 64 | DHT_ERROR_DATA_TIMEOUT, |
crazystick | 0:42ffca439fcc | 65 | DHT_ERROR_CHECKSUM, |
crazystick | 0:42ffca439fcc | 66 | DHT_ERROR_TOO_QUICK |
crazystick | 0:42ffca439fcc | 67 | } DHT22_ERROR; |
crazystick | 0:42ffca439fcc | 68 | |
crazystick | 0:42ffca439fcc | 69 | class DHT22 { |
crazystick | 0:42ffca439fcc | 70 | private: |
crazystick | 0:42ffca439fcc | 71 | time_t _lastReadTime; |
crazystick | 0:42ffca439fcc | 72 | PinName _data; |
crazystick | 0:42ffca439fcc | 73 | float _lastHumidity; |
crazystick | 0:42ffca439fcc | 74 | float _lastTemperature; |
crazystick | 0:42ffca439fcc | 75 | public: |
crazystick | 0:42ffca439fcc | 76 | DHT22(PinName Data); |
crazystick | 0:42ffca439fcc | 77 | ~DHT22(); |
crazystick | 0:42ffca439fcc | 78 | DHT22_ERROR readData(void); |
crazystick | 0:42ffca439fcc | 79 | float getHumidity(); |
crazystick | 0:42ffca439fcc | 80 | float getTemperatureC(); |
crazystick | 0:42ffca439fcc | 81 | void clockReset(); |
crazystick | 0:42ffca439fcc | 82 | }; |
crazystick | 0:42ffca439fcc | 83 | |
crazystick | 0:42ffca439fcc | 84 | #endif /*_DHT22_H_*/ |