frederic blanc
/
MAX31850_HelloWorld
test MAX31850
SHTxx/sht7X.h@4:031e71e61e80, 2016-09-28 (annotated)
- Committer:
- fblanc
- Date:
- Wed Sep 28 06:46:10 2016 +0000
- Revision:
- 4:031e71e61e80
- Parent:
- 0:55f2866e9c0c
test
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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fblanc | 0:55f2866e9c0c | 1 | /* mbed Sensiron SHT7x temperature and humidity sensor library |
fblanc | 0:55f2866e9c0c | 2 | * |
fblanc | 0:55f2866e9c0c | 3 | * Sensiron data at http://www.sensirion.com/en/01_humidity_sensors/06_humidity_sensor_sht75.htm |
fblanc | 0:55f2866e9c0c | 4 | * |
fblanc | 0:55f2866e9c0c | 5 | * Copyright (c) Ian Molesworth October 2010 |
fblanc | 0:55f2866e9c0c | 6 | * |
fblanc | 0:55f2866e9c0c | 7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
fblanc | 0:55f2866e9c0c | 8 | * of this software and associated documentation files (the "Software"), to use |
fblanc | 0:55f2866e9c0c | 9 | * copy or modify the software for private or non-commercial purposes only. |
fblanc | 0:55f2866e9c0c | 10 | * |
fblanc | 0:55f2866e9c0c | 11 | * The above copyright notice and this permission notice shall be included in |
fblanc | 0:55f2866e9c0c | 12 | * all copies or substantial portions of the Software. |
fblanc | 0:55f2866e9c0c | 13 | * |
fblanc | 0:55f2866e9c0c | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
fblanc | 0:55f2866e9c0c | 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
fblanc | 0:55f2866e9c0c | 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
fblanc | 0:55f2866e9c0c | 17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
fblanc | 0:55f2866e9c0c | 18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
fblanc | 0:55f2866e9c0c | 19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
fblanc | 0:55f2866e9c0c | 20 | * THE SOFTWARE. |
fblanc | 0:55f2866e9c0c | 21 | */ |
fblanc | 0:55f2866e9c0c | 22 | |
fblanc | 0:55f2866e9c0c | 23 | |
fblanc | 0:55f2866e9c0c | 24 | #ifndef SHT75_H |
fblanc | 0:55f2866e9c0c | 25 | #define SHT75_H |
fblanc | 0:55f2866e9c0c | 26 | |
fblanc | 0:55f2866e9c0c | 27 | #include "mbed.h" |
fblanc | 0:55f2866e9c0c | 28 | |
fblanc | 0:55f2866e9c0c | 29 | const float SHT_C1= -2.0468; // for 12 Bit humi |
fblanc | 0:55f2866e9c0c | 30 | const float SHT_C2= +0.0367; // for 12 Bit humi |
fblanc | 0:55f2866e9c0c | 31 | const float SHT_C3= 0; // for 12 Bit hum |
fblanc | 0:55f2866e9c0c | 32 | const float SHT_D1= -39.61; // 3v3 14 bit //TL |
fblanc | 0:55f2866e9c0c | 33 | const float SHT_D2= 0.01; //14BIT |
fblanc | 0:55f2866e9c0c | 34 | const float SHT_T1= +0.01; // for 12 Bit |
fblanc | 0:55f2866e9c0c | 35 | const float SHT_T2= +0.00008; // for 12 Bit |
fblanc | 0:55f2866e9c0c | 36 | |
fblanc | 0:55f2866e9c0c | 37 | /** SHT7X driver class |
fblanc | 0:55f2866e9c0c | 38 | * |
fblanc | 0:55f2866e9c0c | 39 | * Example: |
fblanc | 0:55f2866e9c0c | 40 | * @code |
fblanc | 0:55f2866e9c0c | 41 | * //initialise the device read temperature ticks, read humidity ticks and then |
fblanc | 0:55f2866e9c0c | 42 | * // calculate the liniarised humidity value. |
fblanc | 0:55f2866e9c0c | 43 | * #include "mbed.h" |
fblanc | 0:55f2866e9c0c | 44 | * #include "sht7X.h" |
fblanc | 0:55f2866e9c0c | 45 | * |
fblanc | 0:55f2866e9c0c | 46 | * SHT75 sht(p12, p11); |
fblanc | 0:55f2866e9c0c | 47 | * Serial pc(USBTX, USBRX); |
fblanc | 0:55f2866e9c0c | 48 | * |
fblanc | 0:55f2866e9c0c | 49 | * int main() |
fblanc | 0:55f2866e9c0c | 50 | * { |
fblanc | 0:55f2866e9c0c | 51 | * float temperature; // temperature -40 to 120 deg C |
fblanc | 0:55f2866e9c0c | 52 | * float humidity; // relative humidity 1% to 100% |
fblanc | 0:55f2866e9c0c | 53 | * float humi_f,rh_lin,rh_true; // working registers for Illustration purposes |
fblanc | 0:55f2866e9c0c | 54 | * int t; // temporary store for the temp ticks |
fblanc | 0:55f2866e9c0c | 55 | * int h; // temp store for the humidity ticks |
fblanc | 0:55f2866e9c0c | 56 | * |
fblanc | 0:55f2866e9c0c | 57 | * pc.baud(115200); |
fblanc | 0:55f2866e9c0c | 58 | * |
fblanc | 0:55f2866e9c0c | 59 | * while(1) |
fblanc | 0:55f2866e9c0c | 60 | * { |
fblanc | 0:55f2866e9c0c | 61 | * sht.readTempTicks(&t); |
fblanc | 0:55f2866e9c0c | 62 | * temperature = ((float)(t) * 0.01) - 39.61; |
fblanc | 0:55f2866e9c0c | 63 | * |
fblanc | 0:55f2866e9c0c | 64 | * sht.readHumidityTicks(&h); |
fblanc | 0:55f2866e9c0c | 65 | * humi_f = (float)(h); |
fblanc | 0:55f2866e9c0c | 66 | * rh_lin = C3 * humi_f * humi_f + C2 * humi_f + C1; |
fblanc | 0:55f2866e9c0c | 67 | * rh_true=(((temperature/100)-25)*(T1+T2*humi_f)+rh_lin); |
fblanc | 0:55f2866e9c0c | 68 | * if(rh_true>100)rh_true=100; //cut if the value is outside |
fblanc | 0:55f2866e9c0c | 69 | * if(rh_true<1)rh_true=1; //the physical possible range |
fblanc | 0:55f2866e9c0c | 70 | * humidity = rh_true; |
fblanc | 0:55f2866e9c0c | 71 | * pc.printf("Temp: %2.2f RH %2.2f\n\r",temperature, humidity); |
fblanc | 0:55f2866e9c0c | 72 | * } |
fblanc | 0:55f2866e9c0c | 73 | * } |
fblanc | 0:55f2866e9c0c | 74 | * @endcode |
fblanc | 0:55f2866e9c0c | 75 | */ |
fblanc | 0:55f2866e9c0c | 76 | |
fblanc | 0:55f2866e9c0c | 77 | class SHT75 |
fblanc | 0:55f2866e9c0c | 78 | { |
fblanc | 0:55f2866e9c0c | 79 | public: |
fblanc | 0:55f2866e9c0c | 80 | /** |
fblanc | 0:55f2866e9c0c | 81 | * @var temperature float to hold the temp |
fblanc | 0:55f2866e9c0c | 82 | */ |
fblanc | 0:55f2866e9c0c | 83 | float temperature; |
fblanc | 0:55f2866e9c0c | 84 | /** |
fblanc | 0:55f2866e9c0c | 85 | * @var humidity float to hold the calculated humidity |
fblanc | 0:55f2866e9c0c | 86 | */ |
fblanc | 0:55f2866e9c0c | 87 | |
fblanc | 0:55f2866e9c0c | 88 | float humidity; |
fblanc | 0:55f2866e9c0c | 89 | |
fblanc | 0:55f2866e9c0c | 90 | /** Create an SHT object connected to the specified Digital pins |
fblanc | 0:55f2866e9c0c | 91 | * |
fblanc | 0:55f2866e9c0c | 92 | * @param pclock digital pin to use as clock |
fblanc | 0:55f2866e9c0c | 93 | * @param pdata digital pin to use as data bus ( bidirectional ) |
fblanc | 0:55f2866e9c0c | 94 | */ |
fblanc | 0:55f2866e9c0c | 95 | SHT75(PinName pclock, PinName pdata): _clock(pclock), _data(pdata) {}; |
fblanc | 0:55f2866e9c0c | 96 | /** read the temperature ticks value 14 bit resolution |
fblanc | 0:55f2866e9c0c | 97 | * |
fblanc | 0:55f2866e9c0c | 98 | * @param int *temp pointer to an integer to hold the tick value |
fblanc | 0:55f2866e9c0c | 99 | * @returns boolean true if read acknowledges |
fblanc | 0:55f2866e9c0c | 100 | */ |
fblanc | 0:55f2866e9c0c | 101 | bool readTempTicks(int* temp); |
fblanc | 0:55f2866e9c0c | 102 | /** read the humidity ticks value 12 bit resolution |
fblanc | 0:55f2866e9c0c | 103 | * |
fblanc | 0:55f2866e9c0c | 104 | * @param int *temp pointer to an integer to hold the tick value |
fblanc | 0:55f2866e9c0c | 105 | * @returns boolean true if read acknowledges |
fblanc | 0:55f2866e9c0c | 106 | */ |
fblanc | 0:55f2866e9c0c | 107 | bool readHumidityTicks(int* temp); |
fblanc | 0:55f2866e9c0c | 108 | /** start up reset |
fblanc | 0:55f2866e9c0c | 109 | * |
fblanc | 0:55f2866e9c0c | 110 | * call to resync or abort current operation. |
fblanc | 0:55f2866e9c0c | 111 | * worth calling every now and then to make sure your system is not hung. |
fblanc | 0:55f2866e9c0c | 112 | */ |
fblanc | 0:55f2866e9c0c | 113 | void reset(void); |
fblanc | 0:55f2866e9c0c | 114 | void softReset(void); |
fblanc | 0:55f2866e9c0c | 115 | int readStatus(void); |
fblanc | 0:55f2866e9c0c | 116 | |
fblanc | 0:55f2866e9c0c | 117 | private: |
fblanc | 0:55f2866e9c0c | 118 | DigitalInOut _data; |
fblanc | 0:55f2866e9c0c | 119 | DigitalOut _clock; |
fblanc | 0:55f2866e9c0c | 120 | |
fblanc | 0:55f2866e9c0c | 121 | void start(void); |
fblanc | 0:55f2866e9c0c | 122 | int read(char); |
fblanc | 0:55f2866e9c0c | 123 | bool write(char); |
fblanc | 0:55f2866e9c0c | 124 | }; |
fblanc | 0:55f2866e9c0c | 125 | |
fblanc | 0:55f2866e9c0c | 126 | #endif |