Datalogger that reads temperature, humidity and light level every 10 seconds, and store the data in a microSD card (.CSV file).
Dependencies: DS1302 SDFileSystem mbed
This is a weather station/datalogger using a Freescale FRDM-K64F dev board, a LM35 (temperature sensor), a DHT11 (temperature and humidity sensor), a DS1302 (timekeeper module) and a LDR (light level sensor). All the data is periodically stored on a microSDHC card; The acquisition period is adjustable via software (by setting the value of a counter).
There is also (commented) code for sending all these information via serial to a terminal on PC.
Full explanation, details and schematics can be found here: http://embedded-clovis.blogspot.ca/2014/07/temperature-datalogger-with-arm-cortex.html
DHT.h@0:8f0934e41a57, 2014-07-04 (annotated)
- Committer:
- Clovis
- Date:
- Fri Jul 04 08:08:38 2014 +0000
- Revision:
- 0:8f0934e41a57
Datalogger for temperature, humidity and light level, using a FRDM-K64F development board by Freescale and storing data on a microSD card. It keeps track of the time by means of a DS1302 timekeeping chip.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Clovis | 0:8f0934e41a57 | 1 | /* |
Clovis | 0:8f0934e41a57 | 2 | * DHT Library for Digital-output Humidity and Temperature sensors |
Clovis | 0:8f0934e41a57 | 3 | * |
Clovis | 0:8f0934e41a57 | 4 | * Works with DHT11, DHT21, DHT22 |
Clovis | 0:8f0934e41a57 | 5 | * SEN11301P, Grove - Temperature&Humidity Sensor (Seeed Studio) |
Clovis | 0:8f0934e41a57 | 6 | * SEN51035P, Grove - Temperature&Humidity Sensor Pro (Seeed Studio) |
Clovis | 0:8f0934e41a57 | 7 | * AM2302 , temperature-humidity sensor |
Clovis | 0:8f0934e41a57 | 8 | * RHT01,RHT02, RHT03 , Humidity and Temperature Sensor (Sparkfun) |
Clovis | 0:8f0934e41a57 | 9 | * |
Clovis | 0:8f0934e41a57 | 10 | * Copyright (C) Wim De Roeve |
Clovis | 0:8f0934e41a57 | 11 | * based on DHT22 sensor library by HO WING KIT |
Clovis | 0:8f0934e41a57 | 12 | * Arduino DHT11 library |
Clovis | 0:8f0934e41a57 | 13 | * |
Clovis | 0:8f0934e41a57 | 14 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
Clovis | 0:8f0934e41a57 | 15 | * of this software and associated documnetation files (the "Software"), to deal |
Clovis | 0:8f0934e41a57 | 16 | * in the Software without restriction, including without limitation the rights |
Clovis | 0:8f0934e41a57 | 17 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
Clovis | 0:8f0934e41a57 | 18 | * copies of the Software, and to permit persons to whom the Software is |
Clovis | 0:8f0934e41a57 | 19 | * furished to do so, subject to the following conditions: |
Clovis | 0:8f0934e41a57 | 20 | * |
Clovis | 0:8f0934e41a57 | 21 | * The above copyright notice and this permission notice shall be included in |
Clovis | 0:8f0934e41a57 | 22 | * all copies or substantial portions of the Software. |
Clovis | 0:8f0934e41a57 | 23 | * |
Clovis | 0:8f0934e41a57 | 24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
Clovis | 0:8f0934e41a57 | 25 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
Clovis | 0:8f0934e41a57 | 26 | * FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
Clovis | 0:8f0934e41a57 | 27 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
Clovis | 0:8f0934e41a57 | 28 | * LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
Clovis | 0:8f0934e41a57 | 29 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
Clovis | 0:8f0934e41a57 | 30 | * THE SOFTWARE. |
Clovis | 0:8f0934e41a57 | 31 | */ |
Clovis | 0:8f0934e41a57 | 32 | |
Clovis | 0:8f0934e41a57 | 33 | #ifndef MBED_DHT_H |
Clovis | 0:8f0934e41a57 | 34 | #define MBED_DHT_H |
Clovis | 0:8f0934e41a57 | 35 | |
Clovis | 0:8f0934e41a57 | 36 | #include "mbed.h" |
Clovis | 0:8f0934e41a57 | 37 | |
Clovis | 0:8f0934e41a57 | 38 | enum eType{ |
Clovis | 0:8f0934e41a57 | 39 | DHT11 = 11, |
Clovis | 0:8f0934e41a57 | 40 | SEN11301P = 11, |
Clovis | 0:8f0934e41a57 | 41 | RHT01 = 11, |
Clovis | 0:8f0934e41a57 | 42 | DHT22 = 22, |
Clovis | 0:8f0934e41a57 | 43 | AM2302 = 22, |
Clovis | 0:8f0934e41a57 | 44 | SEN51035P = 22, |
Clovis | 0:8f0934e41a57 | 45 | RHT02 = 22, |
Clovis | 0:8f0934e41a57 | 46 | RHT03 = 22 |
Clovis | 0:8f0934e41a57 | 47 | } ; |
Clovis | 0:8f0934e41a57 | 48 | |
Clovis | 0:8f0934e41a57 | 49 | enum eError { |
Clovis | 0:8f0934e41a57 | 50 | ERROR_NONE = 0, |
Clovis | 0:8f0934e41a57 | 51 | BUS_BUSY =1, |
Clovis | 0:8f0934e41a57 | 52 | ERROR_NOT_PRESENT =2 , |
Clovis | 0:8f0934e41a57 | 53 | ERROR_ACK_TOO_LONG =3 , |
Clovis | 0:8f0934e41a57 | 54 | ERROR_SYNC_TIMEOUT = 4, |
Clovis | 0:8f0934e41a57 | 55 | ERROR_DATA_TIMEOUT =5 , |
Clovis | 0:8f0934e41a57 | 56 | ERROR_CHECKSUM = 6, |
Clovis | 0:8f0934e41a57 | 57 | ERROR_NO_PATIENCE =7 |
Clovis | 0:8f0934e41a57 | 58 | } ; |
Clovis | 0:8f0934e41a57 | 59 | |
Clovis | 0:8f0934e41a57 | 60 | typedef enum { |
Clovis | 0:8f0934e41a57 | 61 | CELCIUS =0 , |
Clovis | 0:8f0934e41a57 | 62 | FARENHEIT =1, |
Clovis | 0:8f0934e41a57 | 63 | KELVIN=2 |
Clovis | 0:8f0934e41a57 | 64 | } eScale; |
Clovis | 0:8f0934e41a57 | 65 | |
Clovis | 0:8f0934e41a57 | 66 | |
Clovis | 0:8f0934e41a57 | 67 | class DHT { |
Clovis | 0:8f0934e41a57 | 68 | |
Clovis | 0:8f0934e41a57 | 69 | public: |
Clovis | 0:8f0934e41a57 | 70 | |
Clovis | 0:8f0934e41a57 | 71 | DHT(PinName pin,int DHTtype); |
Clovis | 0:8f0934e41a57 | 72 | ~DHT(); |
Clovis | 0:8f0934e41a57 | 73 | int readData(void); |
Clovis | 0:8f0934e41a57 | 74 | float ReadHumidity(void); |
Clovis | 0:8f0934e41a57 | 75 | float ReadTemperature(eScale Scale); |
Clovis | 0:8f0934e41a57 | 76 | float CalcdewPoint(float celsius, float humidity); |
Clovis | 0:8f0934e41a57 | 77 | float CalcdewPointFast(float celsius, float humidity); |
Clovis | 0:8f0934e41a57 | 78 | |
Clovis | 0:8f0934e41a57 | 79 | private: |
Clovis | 0:8f0934e41a57 | 80 | time_t _lastReadTime; |
Clovis | 0:8f0934e41a57 | 81 | float _lastTemperature; |
Clovis | 0:8f0934e41a57 | 82 | float _lastHumidity; |
Clovis | 0:8f0934e41a57 | 83 | PinName _pin; |
Clovis | 0:8f0934e41a57 | 84 | bool _firsttime; |
Clovis | 0:8f0934e41a57 | 85 | int _DHTtype; |
Clovis | 0:8f0934e41a57 | 86 | int DHT_data[6]; |
Clovis | 0:8f0934e41a57 | 87 | float CalcTemperature(); |
Clovis | 0:8f0934e41a57 | 88 | float CalcHumidity(); |
Clovis | 0:8f0934e41a57 | 89 | float ConvertCelciustoFarenheit(float); |
Clovis | 0:8f0934e41a57 | 90 | float ConvertCelciustoKelvin(float); |
Clovis | 0:8f0934e41a57 | 91 | |
Clovis | 0:8f0934e41a57 | 92 | }; |
Clovis | 0:8f0934e41a57 | 93 | |
Clovis | 0:8f0934e41a57 | 94 | #endif |