Ian Molesworth / SHT75

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Dependents:   temp xj-Nucleo-F303K8-SHT75-TEST

sht75.h@0:f401474a3e96, 2010-10-27 (annotated)

Committer:
nimbusgb
Date:
Wed Oct 27 15:27:38 2010 +0000
Revision:
0:f401474a3e96
0.8

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nimbusgb 0:f401474a3e96 1 /* mbed Sensiron SHT7x temperature and humidity sensor library
nimbusgb 0:f401474a3e96 2 *
nimbusgb 0:f401474a3e96 3 * Sensiron data at http://www.sensirion.com/en/01_humidity_sensors/06_humidity_sensor_sht75.htm
nimbusgb 0:f401474a3e96 4 *
nimbusgb 0:f401474a3e96 5 * Copyright (c) Ian Molesworth October 2010
nimbusgb 0:f401474a3e96 6 *
nimbusgb 0:f401474a3e96 7 * Permission is hereby granted, free of charge, to any person obtaining a copy
nimbusgb 0:f401474a3e96 8 * of this software and associated documentation files (the "Software"), to use
nimbusgb 0:f401474a3e96 9 * copy or modify the software for private or non-commercial purposes only.
nimbusgb 0:f401474a3e96 10 *
nimbusgb 0:f401474a3e96 11 * The above copyright notice and this permission notice shall be included in
nimbusgb 0:f401474a3e96 12 * all copies or substantial portions of the Software.
nimbusgb 0:f401474a3e96 13 *
nimbusgb 0:f401474a3e96 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
nimbusgb 0:f401474a3e96 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
nimbusgb 0:f401474a3e96 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
nimbusgb 0:f401474a3e96 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
nimbusgb 0:f401474a3e96 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
nimbusgb 0:f401474a3e96 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
nimbusgb 0:f401474a3e96 20 * THE SOFTWARE.
nimbusgb 0:f401474a3e96 21 */
nimbusgb 0:f401474a3e96 22
nimbusgb 0:f401474a3e96 23
nimbusgb 0:f401474a3e96 24 #ifndef SHT75_H
nimbusgb 0:f401474a3e96 25 #define SHT75_H
nimbusgb 0:f401474a3e96 26
nimbusgb 0:f401474a3e96 27 #include "mbed.h"
nimbusgb 0:f401474a3e96 28
nimbusgb 0:f401474a3e96 29 const float C1= -4.0; // for 12 Bit humi
nimbusgb 0:f401474a3e96 30 const float C2= +0.0405; // for 12 Bit humi
nimbusgb 0:f401474a3e96 31 const float C3= -0.0000028; // for 12 Bit hum
nimbusgb 0:f401474a3e96 32 const float TL= -39.61; // 3v 14 bit
nimbusgb 0:f401474a3e96 33 const float T1= +0.01; // for 14 Bit @ 5V
nimbusgb 0:f401474a3e96 34 const float T2= +0.00008; // for 14 Bit @ 5V
nimbusgb 0:f401474a3e96 35
nimbusgb 0:f401474a3e96 36 class SHT75
nimbusgb 0:f401474a3e96 37 {
nimbusgb 0:f401474a3e96 38 public:
nimbusgb 0:f401474a3e96 39 /** Create an SHT object connected to the specified Digital pins
nimbusgb 0:f401474a3e96 40 *
nimbusgb 0:f401474a3e96 41 * @param pclock digital pin to use as clock
nimbusgb 0:f401474a3e96 42 * @param pdata digital pin to use as data bus ( bidirectional )
nimbusgb 0:f401474a3e96 43 */
nimbusgb 0:f401474a3e96 44 SHT75(PinName pclock, PinName pdata): _clock(pclock), _data(pdata) {};
nimbusgb 0:f401474a3e96 45 /** read the temperature ticks value 14 bit resolution
nimbusgb 0:f401474a3e96 46 *
nimbusgb 0:f401474a3e96 47 * @param int *temp pointer to an integer to hold the tick value
nimbusgb 0:f401474a3e96 48 * @returns boolean true if read acknowledges
nimbusgb 0:f401474a3e96 49 */
nimbusgb 0:f401474a3e96 50 bool readTempTicks(int* temp);
nimbusgb 0:f401474a3e96 51 /** read the humidity ticks value 12 bit resolution
nimbusgb 0:f401474a3e96 52 *
nimbusgb 0:f401474a3e96 53 * @param int *temp pointer to an integer to hold the tick value
nimbusgb 0:f401474a3e96 54 * @returns boolean true if read acknowledges
nimbusgb 0:f401474a3e96 55 */
nimbusgb 0:f401474a3e96 56 bool readHumidityTicks(int* temp);
nimbusgb 0:f401474a3e96 57 /** start up reset
nimbusgb 0:f401474a3e96 58 *
nimbusgb 0:f401474a3e96 59 * call to resync or abort current operation.
nimbusgb 0:f401474a3e96 60 * worth calling every now and then to make sure your system is not hung.
nimbusgb 0:f401474a3e96 61 */
nimbusgb 0:f401474a3e96 62 void reset(void);
nimbusgb 0:f401474a3e96 63 void softReset(void);
nimbusgb 0:f401474a3e96 64 int readStatus(void);
nimbusgb 0:f401474a3e96 65
nimbusgb 0:f401474a3e96 66 private:
nimbusgb 0:f401474a3e96 67 DigitalInOut _data;
nimbusgb 0:f401474a3e96 68 DigitalOut _clock;
nimbusgb 0:f401474a3e96 69
nimbusgb 0:f401474a3e96 70 void start(void);
nimbusgb 0:f401474a3e96 71 int read(char);
nimbusgb 0:f401474a3e96 72 bool write(char);
nimbusgb 0:f401474a3e96 73 };
nimbusgb 0:f401474a3e96 74
nimbusgb 0:f401474a3e96 75 #endif