Uttam Bhat / driver_mbed_TH02

Grove Temp + Humidity sensor

Fork of driver_mbed_TH02 by Taylor Gy

driver_mbed_TH02.cpp@0:89151affda00, 2017-03-29 (annotated)

Committer:
TaylorGy
Date:
Wed Mar 29 03:09:54 2017 +0000
Revision:
0:89151affda00
Child:
1:acf474af97a7
driver for TH02 sensor

Who changed what in which revision?

UserRevisionLine numberNew contents of line
TaylorGy 0:89151affda00 1 /*
TaylorGy 0:89151affda00 2 * TH02_dev.cpp
TaylorGy 0:89151affda00 3 * Driver for DIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR
TaylorGy 0:89151affda00 4 *
TaylorGy 0:89151affda00 5 * Copyright (c) 2014 seeed technology inc.
TaylorGy 0:89151affda00 6 * Website : www.seeed.cc
TaylorGy 0:89151affda00 7 * Author : Oliver Wang
TaylorGy 0:89151affda00 8 * Create Time: April 2014
TaylorGy 0:89151affda00 9 * Change Log :
TaylorGy 0:89151affda00 10 *
TaylorGy 0:89151affda00 11 * The MIT License (MIT)
TaylorGy 0:89151affda00 12 *
TaylorGy 0:89151affda00 13 * Permission is hereby granted, free of charge, to any person obtaining a copy
TaylorGy 0:89151affda00 14 * of this software and associated documentation files (the "Software"), to deal
TaylorGy 0:89151affda00 15 * in the Software without restriction, including without limitation the rights
TaylorGy 0:89151affda00 16 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
TaylorGy 0:89151affda00 17 * copies of the Software, and to permit persons to whom the Software is
TaylorGy 0:89151affda00 18 * furnished to do so, subject to the following conditions:
TaylorGy 0:89151affda00 19 *
TaylorGy 0:89151affda00 20 * The above copyright notice and this permission notice shall be included in
TaylorGy 0:89151affda00 21 * all copies or substantial portions of the Software.
TaylorGy 0:89151affda00 22 *
TaylorGy 0:89151affda00 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
TaylorGy 0:89151affda00 24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
TaylorGy 0:89151affda00 25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
TaylorGy 0:89151affda00 26 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
TaylorGy 0:89151affda00 27 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
TaylorGy 0:89151affda00 28 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
TaylorGy 0:89151affda00 29 * THE SOFTWARE.
TaylorGy 0:89151affda00 30 */
TaylorGy 0:89151affda00 31
TaylorGy 0:89151affda00 32 /****************************************************************************/
TaylorGy 0:89151affda00 33 /*** Include files ***/
TaylorGy 0:89151affda00 34 /****************************************************************************/
TaylorGy 0:89151affda00 35 #include "driver_mbed_TH02.h"
TaylorGy 0:89151affda00 36 // #include <Wire.h>
TaylorGy 0:89151affda00 37 // #include <Arduino.h>
TaylorGy 0:89151affda00 38
TaylorGy 0:89151affda00 39 /* Use Serial IIC */
TaylorGy 0:89151affda00 40 #ifdef SERIAL_IIC
TaylorGy 0:89151affda00 41 #endif
TaylorGy 0:89151affda00 42
TaylorGy 0:89151affda00 43 TH02_dev myTH02;
TaylorGy 0:89151affda00 44 I2C i2cth02(PB_9, PB_8);
TaylorGy 0:89151affda00 45 /****************************************************************************/
TaylorGy 0:89151affda00 46 /*** Local Variable ***/
TaylorGy 0:89151affda00 47 /****************************************************************************/
TaylorGy 0:89151affda00 48
TaylorGy 0:89151affda00 49
TaylorGy 0:89151affda00 50 /****************************************************************************/
TaylorGy 0:89151affda00 51 /*** Class member Functions ***/
TaylorGy 0:89151affda00 52 /****************************************************************************/
TaylorGy 0:89151affda00 53
TaylorGy 0:89151affda00 54 void TH02_dev::begin(void)
TaylorGy 0:89151affda00 55 {
TaylorGy 0:89151affda00 56 /* Start IIC */
TaylorGy 0:89151affda00 57 // Wire.begin();
TaylorGy 0:89151affda00 58 /* TH02 don't need to software reset */
TaylorGy 0:89151affda00 59 printf("System Start !\r\n\r\n");
TaylorGy 0:89151affda00 60 }
TaylorGy 0:89151affda00 61
TaylorGy 0:89151affda00 62 float TH02_dev::ReadTemperature(void)
TaylorGy 0:89151affda00 63 {
TaylorGy 0:89151affda00 64 /* Start a new temperature conversion */
TaylorGy 0:89151affda00 65 TH02_IIC_WriteReg(REG_CONFIG, CMD_MEASURE_TEMP);
TaylorGy 0:89151affda00 66 //delay(100);
TaylorGy 0:89151affda00 67 /* Wait until conversion is done */
TaylorGy 0:89151affda00 68 while(!isAvailable());
TaylorGy 0:89151affda00 69 uint16_t value = TH02_IIC_ReadData();
TaylorGy 0:89151affda00 70
TaylorGy 0:89151affda00 71 value = value >> 2;
TaylorGy 0:89151affda00 72 /*
TaylorGy 0:89151affda00 73 Formula:
TaylorGy 0:89151affda00 74 Temperature(C) = (Value/32) - 50
TaylorGy 0:89151affda00 75 */
TaylorGy 0:89151affda00 76 float temper = (value/32.0)-50.0;
TaylorGy 0:89151affda00 77
TaylorGy 0:89151affda00 78 return temper;
TaylorGy 0:89151affda00 79 }
TaylorGy 0:89151affda00 80
TaylorGy 0:89151affda00 81 float TH02_dev::ReadHumidity(void)
TaylorGy 0:89151affda00 82 {
TaylorGy 0:89151affda00 83 /* Start a new humility conversion */
TaylorGy 0:89151affda00 84 TH02_IIC_WriteReg(REG_CONFIG, CMD_MEASURE_HUMI);
TaylorGy 0:89151affda00 85
TaylorGy 0:89151affda00 86 /* Wait until conversion is done */
TaylorGy 0:89151affda00 87 //delay(100);
TaylorGy 0:89151affda00 88 while(!isAvailable());
TaylorGy 0:89151affda00 89 uint16_t value = TH02_IIC_ReadData();
TaylorGy 0:89151affda00 90
TaylorGy 0:89151affda00 91 value = value >> 4;
TaylorGy 0:89151affda00 92
TaylorGy 0:89151affda00 93 /*
TaylorGy 0:89151affda00 94 Formula:
TaylorGy 0:89151affda00 95 Humidity(%) = (Value/16) - 24
TaylorGy 0:89151affda00 96 */
TaylorGy 0:89151affda00 97
TaylorGy 0:89151affda00 98 float humility = (value/16.0)-24.0;
TaylorGy 0:89151affda00 99
TaylorGy 0:89151affda00 100 return humility;
TaylorGy 0:89151affda00 101 }
TaylorGy 0:89151affda00 102
TaylorGy 0:89151affda00 103 /****************************************************************************/
TaylorGy 0:89151affda00 104 /*** Local Functions ***/
TaylorGy 0:89151affda00 105 /****************************************************************************/
TaylorGy 0:89151affda00 106 uint8_t TH02_dev::isAvailable()
TaylorGy 0:89151affda00 107 {
TaylorGy 0:89151affda00 108 uint8_t status = TH02_IIC_ReadReg(REG_STATUS);
TaylorGy 0:89151affda00 109 if(status & STATUS_RDY_MASK)
TaylorGy 0:89151affda00 110 {
TaylorGy 0:89151affda00 111 return 0; //ready
TaylorGy 0:89151affda00 112 }
TaylorGy 0:89151affda00 113 else
TaylorGy 0:89151affda00 114 {
TaylorGy 0:89151affda00 115 return 1; //not ready yet
TaylorGy 0:89151affda00 116 }
TaylorGy 0:89151affda00 117 }
TaylorGy 0:89151affda00 118
TaylorGy 0:89151affda00 119 void TH02_dev::TH02_IIC_WriteCmd(uint8_t u8Cmd)
TaylorGy 0:89151affda00 120 {
TaylorGy 0:89151affda00 121 char cmd = u8Cmd;
TaylorGy 0:89151affda00 122 /* Port to arduino */
TaylorGy 0:89151affda00 123 // Wire.beginTransmission(TH02_I2C_DEV_ID);
TaylorGy 0:89151affda00 124 // Wire.write(u8Cmd);
TaylorGy 0:89151affda00 125 // Wire.endTransmission();
TaylorGy 0:89151affda00 126 i2cth02.write(TH02_I2C_DEV_ID, &cmd, 1);
TaylorGy 0:89151affda00 127
TaylorGy 0:89151affda00 128 }
TaylorGy 0:89151affda00 129
TaylorGy 0:89151affda00 130 uint8_t TH02_dev::TH02_IIC_ReadReg(uint8_t u8Reg)
TaylorGy 0:89151affda00 131 {
TaylorGy 0:89151affda00 132 /* Port to arduino */
TaylorGy 0:89151affda00 133 char Temp = 0;
TaylorGy 0:89151affda00 134
TaylorGy 0:89151affda00 135 /* Send a register reading command */
TaylorGy 0:89151affda00 136 TH02_IIC_WriteCmd(u8Reg);
TaylorGy 0:89151affda00 137
TaylorGy 0:89151affda00 138 // Wire.requestFrom(TH02_I2C_DEV_ID, 1);
TaylorGy 0:89151affda00 139 // while(Wire.available())
TaylorGy 0:89151affda00 140 // {
TaylorGy 0:89151affda00 141 // Temp = Wire.read();
TaylorGy 0:89151affda00 142 // }
TaylorGy 0:89151affda00 143
TaylorGy 0:89151affda00 144 i2cth02.read(TH02_I2C_DEV_ID, &Temp, 1);
TaylorGy 0:89151affda00 145
TaylorGy 0:89151affda00 146 return Temp;
TaylorGy 0:89151affda00 147 }
TaylorGy 0:89151affda00 148
TaylorGy 0:89151affda00 149 void TH02_dev::TH02_IIC_WriteReg(uint8_t u8Reg,uint8_t u8Data)
TaylorGy 0:89151affda00 150 {
TaylorGy 0:89151affda00 151 // Wire.beginTransmission(TH02_I2C_DEV_ID);
TaylorGy 0:89151affda00 152 // Wire.write(u8Reg);
TaylorGy 0:89151affda00 153 // Wire.write(u8Data);
TaylorGy 0:89151affda00 154 // Wire.endTransmission();
TaylorGy 0:89151affda00 155 char cmd[2];
TaylorGy 0:89151affda00 156 cmd[0] = u8Reg;
TaylorGy 0:89151affda00 157 cmd[1] = u8Data;
TaylorGy 0:89151affda00 158 i2cth02.write(TH02_I2C_DEV_ID, cmd, 2);
TaylorGy 0:89151affda00 159 }
TaylorGy 0:89151affda00 160
TaylorGy 0:89151affda00 161 uint16_t TH02_dev::TH02_IIC_ReadData(void)
TaylorGy 0:89151affda00 162 {
TaylorGy 0:89151affda00 163 /* Port to arduino */
TaylorGy 0:89151affda00 164 uint16_t Temp = TH02_IIC_ReadData2byte();
TaylorGy 0:89151affda00 165 return Temp;
TaylorGy 0:89151affda00 166 }
TaylorGy 0:89151affda00 167
TaylorGy 0:89151affda00 168 uint16_t TH02_dev::TH02_IIC_ReadData2byte()
TaylorGy 0:89151affda00 169 {
TaylorGy 0:89151affda00 170 uint16_t TempData = 0;
TaylorGy 0:89151affda00 171 // uint16_t tmpArray[3]={0};
TaylorGy 0:89151affda00 172 char tmpArray[3];
TaylorGy 0:89151affda00 173
TaylorGy 0:89151affda00 174 TH02_IIC_WriteCmd(REG_DATA_H);
TaylorGy 0:89151affda00 175
TaylorGy 0:89151affda00 176 // Wire.requestFrom(TH02_I2C_DEV_ID, 3);
TaylorGy 0:89151affda00 177 // while(Wire.available())
TaylorGy 0:89151affda00 178 // {
TaylorGy 0:89151affda00 179 // tmpArray[cnt] = (uint16_t)Wire.read();
TaylorGy 0:89151affda00 180 // cnt++;
TaylorGy 0:89151affda00 181 // }
TaylorGy 0:89151affda00 182 i2cth02.read(TH02_I2C_DEV_ID, tmpArray, 3);
TaylorGy 0:89151affda00 183
TaylorGy 0:89151affda00 184 /* MSB */
TaylorGy 0:89151affda00 185 TempData = (tmpArray[1]<<8)|(tmpArray[2]);
TaylorGy 0:89151affda00 186 return TempData;
TaylorGy 0:89151affda00 187 }