Ian Molesworth
Sensiron SHT 7x Temperature and humidity device library
Dependents: temp xj-Nucleo-F303K8-SHT75-TEST
sht7X.h@1:20aa2d4a28bf, 2010-10-27 (annotated)
- Committer:
- nimbusgb
- Date:
- Wed Oct 27 15:51:27 2010 +0000
- Revision:
- 1:20aa2d4a28bf
- Child:
- 2:dd218144f9fe
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| nimbusgb | 1:20aa2d4a28bf | 1 | /* mbed Sensiron SHT7x temperature and humidity sensor library |
| nimbusgb | 1:20aa2d4a28bf | 2 | * |
| nimbusgb | 1:20aa2d4a28bf | 3 | * Sensiron data at http://www.sensirion.com/en/01_humidity_sensors/06_humidity_sensor_sht75.htm |
| nimbusgb | 1:20aa2d4a28bf | 4 | * |
| nimbusgb | 1:20aa2d4a28bf | 5 | * Copyright (c) Ian Molesworth October 2010 |
| nimbusgb | 1:20aa2d4a28bf | 6 | * |
| nimbusgb | 1:20aa2d4a28bf | 7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| nimbusgb | 1:20aa2d4a28bf | 8 | * of this software and associated documentation files (the "Software"), to use |
| nimbusgb | 1:20aa2d4a28bf | 9 | * copy or modify the software for private or non-commercial purposes only. |
| nimbusgb | 1:20aa2d4a28bf | 10 | * |
| nimbusgb | 1:20aa2d4a28bf | 11 | * The above copyright notice and this permission notice shall be included in |
| nimbusgb | 1:20aa2d4a28bf | 12 | * all copies or substantial portions of the Software. |
| nimbusgb | 1:20aa2d4a28bf | 13 | * |
| nimbusgb | 1:20aa2d4a28bf | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| nimbusgb | 1:20aa2d4a28bf | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| nimbusgb | 1:20aa2d4a28bf | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| nimbusgb | 1:20aa2d4a28bf | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| nimbusgb | 1:20aa2d4a28bf | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| nimbusgb | 1:20aa2d4a28bf | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| nimbusgb | 1:20aa2d4a28bf | 20 | * THE SOFTWARE. |
| nimbusgb | 1:20aa2d4a28bf | 21 | */ |
| nimbusgb | 1:20aa2d4a28bf | 22 | |
| nimbusgb | 1:20aa2d4a28bf | 23 | |
| nimbusgb | 1:20aa2d4a28bf | 24 | #ifndef SHT75_H |
| nimbusgb | 1:20aa2d4a28bf | 25 | #define SHT75_H |
| nimbusgb | 1:20aa2d4a28bf | 26 | |
| nimbusgb | 1:20aa2d4a28bf | 27 | #include "mbed.h" |
| nimbusgb | 1:20aa2d4a28bf | 28 | |
| nimbusgb | 1:20aa2d4a28bf | 29 | const float C1= -4.0; // for 12 Bit humi |
| nimbusgb | 1:20aa2d4a28bf | 30 | const float C2= +0.0405; // for 12 Bit humi |
| nimbusgb | 1:20aa2d4a28bf | 31 | const float C3= -0.0000028; // for 12 Bit hum |
| nimbusgb | 1:20aa2d4a28bf | 32 | const float TL= -39.61; // 3v 14 bit |
| nimbusgb | 1:20aa2d4a28bf | 33 | const float T1= +0.01; // for 14 Bit @ 5V |
| nimbusgb | 1:20aa2d4a28bf | 34 | const float T2= +0.00008; // for 14 Bit @ 5V |
| nimbusgb | 1:20aa2d4a28bf | 35 | |
| nimbusgb | 1:20aa2d4a28bf | 36 | /** SHT7x class |
| nimbusgb | 1:20aa2d4a28bf | 37 | * |
| nimbusgb | 1:20aa2d4a28bf | 38 | * Example: |
| nimbusgb | 1:20aa2d4a28bf | 39 | * @code |
| nimbusgb | 1:20aa2d4a28bf | 40 | * //initialise the device read temperature ticks, read humidity ticks and then |
| nimbusgb | 1:20aa2d4a28bf | 41 | * calculate the liniarised humidity value. |
| nimbusgb | 1:20aa2d4a28bf | 42 | * #include "mbed.h" |
| nimbusgb | 1:20aa2d4a28bf | 43 | * #include "SHT7X.h" |
| nimbusgb | 1:20aa2d4a28bf | 44 | 00035 * |
| nimbusgb | 1:20aa2d4a28bf | 45 | 00036 * Servo myservo(p21); |
| nimbusgb | 1:20aa2d4a28bf | 46 | 00037 * |
| nimbusgb | 1:20aa2d4a28bf | 47 | 00038 * int main() { |
| nimbusgb | 1:20aa2d4a28bf | 48 | 00039 * while(1) { |
| nimbusgb | 1:20aa2d4a28bf | 49 | 00040 * for(int i=0; i<100; i++) { |
| nimbusgb | 1:20aa2d4a28bf | 50 | 00041 * myservo = i/100.0; |
| nimbusgb | 1:20aa2d4a28bf | 51 | 00042 * wait(0.01); |
| nimbusgb | 1:20aa2d4a28bf | 52 | 00043 * } |
| nimbusgb | 1:20aa2d4a28bf | 53 | 00044 * for(int i=100; i>0; i--) { |
| nimbusgb | 1:20aa2d4a28bf | 54 | 00045 * myservo = i/100.0; |
| nimbusgb | 1:20aa2d4a28bf | 55 | 00046 * wait(0.01); |
| nimbusgb | 1:20aa2d4a28bf | 56 | 00047 * } |
| nimbusgb | 1:20aa2d4a28bf | 57 | 00048 * } |
| nimbusgb | 1:20aa2d4a28bf | 58 | 00049 * } |
| nimbusgb | 1:20aa2d4a28bf | 59 | 00050 * @endcode |
| nimbusgb | 1:20aa2d4a28bf | 60 | 00051 */ |
| nimbusgb | 1:20aa2d4a28bf | 61 | class SHT75 |
| nimbusgb | 1:20aa2d4a28bf | 62 | { |
| nimbusgb | 1:20aa2d4a28bf | 63 | public: |
| nimbusgb | 1:20aa2d4a28bf | 64 | /** Create an SHT object connected to the specified Digital pins |
| nimbusgb | 1:20aa2d4a28bf | 65 | * |
| nimbusgb | 1:20aa2d4a28bf | 66 | * @param pclock digital pin to use as clock |
| nimbusgb | 1:20aa2d4a28bf | 67 | * @param pdata digital pin to use as data bus ( bidirectional ) |
| nimbusgb | 1:20aa2d4a28bf | 68 | */ |
| nimbusgb | 1:20aa2d4a28bf | 69 | SHT75(PinName pclock, PinName pdata): _clock(pclock), _data(pdata) {}; |
| nimbusgb | 1:20aa2d4a28bf | 70 | /** read the temperature ticks value 14 bit resolution |
| nimbusgb | 1:20aa2d4a28bf | 71 | * |
| nimbusgb | 1:20aa2d4a28bf | 72 | * @param int *temp pointer to an integer to hold the tick value |
| nimbusgb | 1:20aa2d4a28bf | 73 | * @returns boolean true if read acknowledges |
| nimbusgb | 1:20aa2d4a28bf | 74 | */ |
| nimbusgb | 1:20aa2d4a28bf | 75 | bool readTempTicks(int* temp); |
| nimbusgb | 1:20aa2d4a28bf | 76 | /** read the humidity ticks value 12 bit resolution |
| nimbusgb | 1:20aa2d4a28bf | 77 | * |
| nimbusgb | 1:20aa2d4a28bf | 78 | * @param int *temp pointer to an integer to hold the tick value |
| nimbusgb | 1:20aa2d4a28bf | 79 | * @returns boolean true if read acknowledges |
| nimbusgb | 1:20aa2d4a28bf | 80 | */ |
| nimbusgb | 1:20aa2d4a28bf | 81 | bool readHumidityTicks(int* temp); |
| nimbusgb | 1:20aa2d4a28bf | 82 | /** start up reset |
| nimbusgb | 1:20aa2d4a28bf | 83 | * |
| nimbusgb | 1:20aa2d4a28bf | 84 | * call to resync or abort current operation. |
| nimbusgb | 1:20aa2d4a28bf | 85 | * worth calling every now and then to make sure your system is not hung. |
| nimbusgb | 1:20aa2d4a28bf | 86 | */ |
| nimbusgb | 1:20aa2d4a28bf | 87 | void reset(void); |
| nimbusgb | 1:20aa2d4a28bf | 88 | void softReset(void); |
| nimbusgb | 1:20aa2d4a28bf | 89 | int readStatus(void); |
| nimbusgb | 1:20aa2d4a28bf | 90 | |
| nimbusgb | 1:20aa2d4a28bf | 91 | private: |
| nimbusgb | 1:20aa2d4a28bf | 92 | DigitalInOut _data; |
| nimbusgb | 1:20aa2d4a28bf | 93 | DigitalOut _clock; |
| nimbusgb | 1:20aa2d4a28bf | 94 | |
| nimbusgb | 1:20aa2d4a28bf | 95 | void start(void); |
| nimbusgb | 1:20aa2d4a28bf | 96 | int read(char); |
| nimbusgb | 1:20aa2d4a28bf | 97 | bool write(char); |
| nimbusgb | 1:20aa2d4a28bf | 98 | }; |
| nimbusgb | 1:20aa2d4a28bf | 99 | |
| nimbusgb | 1:20aa2d4a28bf | 100 | #endif |