Library for Sensirion Environmental Sensor Shield for SGP30 & SHTC1
Dependents: example-sensirion-ublox-c030
sensirion_ess.h
00001 /* 00002 * Copyright (c) 2017-2018, Sensirion AG 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions are met: 00007 * 00008 * * Redistributions of source code must retain the above copyright notice, this 00009 * list of conditions and the following disclaimer. 00010 * 00011 * * Redistributions in binary form must reproduce the above copyright notice, 00012 * this list of conditions and the following disclaimer in the documentation 00013 * and/or other materials provided with the distribution. 00014 * 00015 * * Neither the name of Sensirion AG nor the names of its 00016 * contributors may be used to endorse or promote products derived from 00017 * this software without specific prior written permission. 00018 * 00019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00020 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00021 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE 00023 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00024 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 00025 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 00026 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00027 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00028 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00029 */ 00030 00031 #ifndef SENSIRION_ESS 00032 #define SENSIRION_ESS 00033 #include "mbed.h" 00034 #define LED_RED D9 00035 #define LED_YEL D10 00036 #define LED_GRN D11 00037 class SensirionESS 00038 { 00039 public: 00040 SensirionESS(void *interface); 00041 00042 int initSensors(); 00043 00044 int measureRHT(); 00045 int measureIAQ(); 00046 00047 bool isInitialized(); 00048 00049 float getTemperature() const; 00050 float getHumidity() const; 00051 00052 int getProductType() const; 00053 int getFeatureSetVersion() const; 00054 00055 float getTVOC() const; 00056 float getECO2() const; // SGP30 only 00057 00058 const char* getError() const; 00059 00060 void setLedRYG(int r, int y, int g); 00061 00062 int remainingWaitTimeMS(); 00063 00064 const static int PRODUCT_TYPE_SGP30 = 0; 00065 const static int PRODUCT_TYPE_SGPC3 = 1; 00066 00067 private: 00068 int8_t i2c_write(uint8_t addr, const uint8_t* data, uint16_t count); 00069 int8_t i2c_read(uint8_t addr, uint8_t* data, uint16_t count); 00070 static uint8_t crc8(const uint8_t* data, uint8_t len); 00071 00072 inline void setError(const char* error); 00073 int readFeatureSetInt(); 00074 int measureRHTInt(); 00075 int initSGP(); 00076 void setLedRYGInt(int r, int y, int g); 00077 00078 const static int ERROR_BUF_LENGTH = 255; 00079 const static int CMD_LENGTH = 2; 00080 00081 const static int SHT_DATA_LENGTH = 6; 00082 const static int SHT_I2C_ADDR = 0x70; 00083 const static int SHT_MEASURE_DELAY = 15; // SHTC1 worst case 00084 00085 const static int SGP30_DATA_LENGTH = 6; 00086 const static int SGPC3_DATA_LENGTH = 3; 00087 const static int SGP_I2C_ADDR = 0x58; 00088 const static int SGP_MEASURE_DELAY = 50; 00089 00090 const static int SGP_RED_THRESHOLD = 150; 00091 const static int SGP_YEL_THRESHOLD = 125; 00092 00093 const static int SGPC3_INTERMEASURE_DELAY = 2000; 00094 const static int SGP30_INTERMEASURE_DELAY = 1000; 00095 00096 int SGP_INTERMEASURE_DELAY = SGP30_INTERMEASURE_DELAY; 00097 int SGP_DATA_LENGTH = SGP30_DATA_LENGTH; 00098 00099 float mTemperature = -250; 00100 float mHumidity = -1; 00101 float mTVOC = -1; 00102 float mECO2 = -1; 00103 00104 int mProductType = 0; 00105 int mFeatureSetVersion = 0; 00106 00107 unsigned long mSGPMeasurementTimestamp = 0; 00108 00109 bool mInitialized = false; 00110 char mErrorBuf[ERROR_BUF_LENGTH]; 00111 uint8_t mDataBuf[SHT_DATA_LENGTH]; // max(SHT_DATA_LENGTH, SGP_DATA_LENGTH) 00112 I2C *i2c_connection; 00113 Timer *t; 00114 00115 00116 }; 00117 00118 #endif /* SENSIRION_ESS */
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