Demo application for using the AT&T IoT Starter Kit Powered by AWS.
Dependencies: SDFileSystem
Fork of ATT_AWS_IoT_demo by
IoT Starter Kit Powered by AWS Demo
This program demonstrates the AT&T IoT Starter Kit sending data directly into AWS IoT. It's explained and used in the Getting Started with the IoT Starter Kit Powered by AWS on starterkit.att.com.
What's required
- AT&T IoT LTE Add-on (also known as the Cellular Shield)
- NXP K64F - for programming
- microSD card - used to store your AWS security credentials
- AWS account
- Python, locally installed
If you don't already have an IoT Starter Kit, you can purchase a kit here. The IoT Starter Kit Powered by AWS includes the LTE cellular shield, K64F, and a microSD card.
Sensors/Temperature/hts221_driver.cpp@20:ee34856ae510, 2016-12-07 (annotated)
- Committer:
- ampembeng
- Date:
- Wed Dec 07 20:37:20 2016 +0000
- Revision:
- 20:ee34856ae510
The demo now reads the FRDM-K64F temperature and humidity sensors and adds that data to the reported AWS IoT device Shadow. Both the firmware and Python GUI are updated.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
ampembeng | 20:ee34856ae510 | 1 | |
ampembeng | 20:ee34856ae510 | 2 | #include "HTS221.h" |
ampembeng | 20:ee34856ae510 | 3 | |
ampembeng | 20:ee34856ae510 | 4 | |
ampembeng | 20:ee34856ae510 | 5 | // ------------------------------------------------------------------------------ |
ampembeng | 20:ee34856ae510 | 6 | //jmf -- define I2C pins and functions to read & write to I2C device |
ampembeng | 20:ee34856ae510 | 7 | |
ampembeng | 20:ee34856ae510 | 8 | #include <string> |
ampembeng | 20:ee34856ae510 | 9 | #include "mbed.h" |
ampembeng | 20:ee34856ae510 | 10 | |
ampembeng | 20:ee34856ae510 | 11 | #include "hardware.h" |
ampembeng | 20:ee34856ae510 | 12 | //I2C i2c(PTC11, PTC10); //SDA, SCL -- define the I2C pins being used. Defined in a |
ampembeng | 20:ee34856ae510 | 13 | //common locatioin since sensors also use I2C |
ampembeng | 20:ee34856ae510 | 14 | |
ampembeng | 20:ee34856ae510 | 15 | // Read a single unsigned char from addressToRead and return it as a unsigned char |
ampembeng | 20:ee34856ae510 | 16 | unsigned char HTS221::readRegister(unsigned char slaveAddress, unsigned char ToRead) |
ampembeng | 20:ee34856ae510 | 17 | { |
ampembeng | 20:ee34856ae510 | 18 | char data = ToRead; |
ampembeng | 20:ee34856ae510 | 19 | |
ampembeng | 20:ee34856ae510 | 20 | i2c.write(slaveAddress, &data, 1, 1); |
ampembeng | 20:ee34856ae510 | 21 | i2c.read(slaveAddress, &data, 1, 0); |
ampembeng | 20:ee34856ae510 | 22 | return data; |
ampembeng | 20:ee34856ae510 | 23 | } |
ampembeng | 20:ee34856ae510 | 24 | |
ampembeng | 20:ee34856ae510 | 25 | // Writes a single unsigned char (dataToWrite) into regToWrite |
ampembeng | 20:ee34856ae510 | 26 | int HTS221::writeRegister(unsigned char slaveAddress, unsigned char regToWrite, unsigned char dataToWrite) |
ampembeng | 20:ee34856ae510 | 27 | { |
ampembeng | 20:ee34856ae510 | 28 | const char data[] = {regToWrite, dataToWrite}; |
ampembeng | 20:ee34856ae510 | 29 | |
ampembeng | 20:ee34856ae510 | 30 | return i2c.write(slaveAddress,data,2,0); |
ampembeng | 20:ee34856ae510 | 31 | } |
ampembeng | 20:ee34856ae510 | 32 | |
ampembeng | 20:ee34856ae510 | 33 | |
ampembeng | 20:ee34856ae510 | 34 | //jmf end |
ampembeng | 20:ee34856ae510 | 35 | // ------------------------------------------------------------------------------ |
ampembeng | 20:ee34856ae510 | 36 | |
ampembeng | 20:ee34856ae510 | 37 | //static inline int humidityReady(uint8_t data) { |
ampembeng | 20:ee34856ae510 | 38 | // return (data & 0x02); |
ampembeng | 20:ee34856ae510 | 39 | //} |
ampembeng | 20:ee34856ae510 | 40 | //static inline int temperatureReady(uint8_t data) { |
ampembeng | 20:ee34856ae510 | 41 | // return (data & 0x01); |
ampembeng | 20:ee34856ae510 | 42 | //} |
ampembeng | 20:ee34856ae510 | 43 | |
ampembeng | 20:ee34856ae510 | 44 | |
ampembeng | 20:ee34856ae510 | 45 | HTS221::HTS221(void) : _address(HTS221_ADDRESS) |
ampembeng | 20:ee34856ae510 | 46 | { |
ampembeng | 20:ee34856ae510 | 47 | _temperature = 0; |
ampembeng | 20:ee34856ae510 | 48 | _humidity = 0; |
ampembeng | 20:ee34856ae510 | 49 | } |
ampembeng | 20:ee34856ae510 | 50 | |
ampembeng | 20:ee34856ae510 | 51 | |
ampembeng | 20:ee34856ae510 | 52 | int HTS221::begin(void) |
ampembeng | 20:ee34856ae510 | 53 | { |
ampembeng | 20:ee34856ae510 | 54 | uint8_t data; |
ampembeng | 20:ee34856ae510 | 55 | |
ampembeng | 20:ee34856ae510 | 56 | data = readRegister(_address, WHO_AM_I); |
ampembeng | 20:ee34856ae510 | 57 | if (data == WHO_AM_I_RETURN){ |
ampembeng | 20:ee34856ae510 | 58 | if (activate()){ |
ampembeng | 20:ee34856ae510 | 59 | storeCalibration(); |
ampembeng | 20:ee34856ae510 | 60 | return data; |
ampembeng | 20:ee34856ae510 | 61 | } |
ampembeng | 20:ee34856ae510 | 62 | } |
ampembeng | 20:ee34856ae510 | 63 | |
ampembeng | 20:ee34856ae510 | 64 | return 0; |
ampembeng | 20:ee34856ae510 | 65 | } |
ampembeng | 20:ee34856ae510 | 66 | |
ampembeng | 20:ee34856ae510 | 67 | int |
ampembeng | 20:ee34856ae510 | 68 | HTS221::storeCalibration(void) |
ampembeng | 20:ee34856ae510 | 69 | { |
ampembeng | 20:ee34856ae510 | 70 | uint8_t data; |
ampembeng | 20:ee34856ae510 | 71 | uint16_t tmp; |
ampembeng | 20:ee34856ae510 | 72 | |
ampembeng | 20:ee34856ae510 | 73 | for (int reg=CALIB_START; reg<=CALIB_END; reg++) { |
ampembeng | 20:ee34856ae510 | 74 | if ((reg!=CALIB_START+8) && (reg!=CALIB_START+9) && (reg!=CALIB_START+4)) { |
ampembeng | 20:ee34856ae510 | 75 | |
ampembeng | 20:ee34856ae510 | 76 | data = readRegister(HTS221_ADDRESS, reg); |
ampembeng | 20:ee34856ae510 | 77 | |
ampembeng | 20:ee34856ae510 | 78 | switch (reg) { |
ampembeng | 20:ee34856ae510 | 79 | case CALIB_START: |
ampembeng | 20:ee34856ae510 | 80 | _h0_rH = data; |
ampembeng | 20:ee34856ae510 | 81 | break; |
ampembeng | 20:ee34856ae510 | 82 | case CALIB_START+1: |
ampembeng | 20:ee34856ae510 | 83 | _h1_rH = data; |
ampembeng | 20:ee34856ae510 | 84 | break; |
ampembeng | 20:ee34856ae510 | 85 | case CALIB_START+2: |
ampembeng | 20:ee34856ae510 | 86 | _T0_degC = data; |
ampembeng | 20:ee34856ae510 | 87 | break; |
ampembeng | 20:ee34856ae510 | 88 | case CALIB_START+3: |
ampembeng | 20:ee34856ae510 | 89 | _T1_degC = data; |
ampembeng | 20:ee34856ae510 | 90 | break; |
ampembeng | 20:ee34856ae510 | 91 | |
ampembeng | 20:ee34856ae510 | 92 | case CALIB_START+5: |
ampembeng | 20:ee34856ae510 | 93 | tmp = _T0_degC; |
ampembeng | 20:ee34856ae510 | 94 | _T0_degC = (data&0x3)<<8; |
ampembeng | 20:ee34856ae510 | 95 | _T0_degC |= tmp; |
ampembeng | 20:ee34856ae510 | 96 | |
ampembeng | 20:ee34856ae510 | 97 | tmp = _T1_degC; |
ampembeng | 20:ee34856ae510 | 98 | _T1_degC = ((data&0xC)>>2)<<8; |
ampembeng | 20:ee34856ae510 | 99 | _T1_degC |= tmp; |
ampembeng | 20:ee34856ae510 | 100 | break; |
ampembeng | 20:ee34856ae510 | 101 | case CALIB_START+6: |
ampembeng | 20:ee34856ae510 | 102 | _H0_T0 = data; |
ampembeng | 20:ee34856ae510 | 103 | break; |
ampembeng | 20:ee34856ae510 | 104 | case CALIB_START+7: |
ampembeng | 20:ee34856ae510 | 105 | _H0_T0 |= data<<8; |
ampembeng | 20:ee34856ae510 | 106 | break; |
ampembeng | 20:ee34856ae510 | 107 | case CALIB_START+0xA: |
ampembeng | 20:ee34856ae510 | 108 | _H1_T0 = data; |
ampembeng | 20:ee34856ae510 | 109 | break; |
ampembeng | 20:ee34856ae510 | 110 | case CALIB_START+0xB: |
ampembeng | 20:ee34856ae510 | 111 | _H1_T0 |= data <<8; |
ampembeng | 20:ee34856ae510 | 112 | break; |
ampembeng | 20:ee34856ae510 | 113 | case CALIB_START+0xC: |
ampembeng | 20:ee34856ae510 | 114 | _T0_OUT = data; |
ampembeng | 20:ee34856ae510 | 115 | break; |
ampembeng | 20:ee34856ae510 | 116 | case CALIB_START+0xD: |
ampembeng | 20:ee34856ae510 | 117 | _T0_OUT |= data << 8; |
ampembeng | 20:ee34856ae510 | 118 | break; |
ampembeng | 20:ee34856ae510 | 119 | case CALIB_START+0xE: |
ampembeng | 20:ee34856ae510 | 120 | _T1_OUT = data; |
ampembeng | 20:ee34856ae510 | 121 | break; |
ampembeng | 20:ee34856ae510 | 122 | case CALIB_START+0xF: |
ampembeng | 20:ee34856ae510 | 123 | _T1_OUT |= data << 8; |
ampembeng | 20:ee34856ae510 | 124 | break; |
ampembeng | 20:ee34856ae510 | 125 | |
ampembeng | 20:ee34856ae510 | 126 | |
ampembeng | 20:ee34856ae510 | 127 | case CALIB_START+8: |
ampembeng | 20:ee34856ae510 | 128 | case CALIB_START+9: |
ampembeng | 20:ee34856ae510 | 129 | case CALIB_START+4: |
ampembeng | 20:ee34856ae510 | 130 | //DO NOTHING |
ampembeng | 20:ee34856ae510 | 131 | break; |
ampembeng | 20:ee34856ae510 | 132 | |
ampembeng | 20:ee34856ae510 | 133 | // to cover any possible error |
ampembeng | 20:ee34856ae510 | 134 | default: |
ampembeng | 20:ee34856ae510 | 135 | return false; |
ampembeng | 20:ee34856ae510 | 136 | } /* switch */ |
ampembeng | 20:ee34856ae510 | 137 | } /* if */ |
ampembeng | 20:ee34856ae510 | 138 | } /* for */ |
ampembeng | 20:ee34856ae510 | 139 | return true; |
ampembeng | 20:ee34856ae510 | 140 | } |
ampembeng | 20:ee34856ae510 | 141 | |
ampembeng | 20:ee34856ae510 | 142 | |
ampembeng | 20:ee34856ae510 | 143 | int |
ampembeng | 20:ee34856ae510 | 144 | HTS221::activate(void) |
ampembeng | 20:ee34856ae510 | 145 | { |
ampembeng | 20:ee34856ae510 | 146 | uint8_t data; |
ampembeng | 20:ee34856ae510 | 147 | |
ampembeng | 20:ee34856ae510 | 148 | data = readRegister(_address, CTRL_REG1); |
ampembeng | 20:ee34856ae510 | 149 | data |= POWER_UP; |
ampembeng | 20:ee34856ae510 | 150 | data |= ODR0_SET; |
ampembeng | 20:ee34856ae510 | 151 | writeRegister(_address, CTRL_REG1, data); |
ampembeng | 20:ee34856ae510 | 152 | |
ampembeng | 20:ee34856ae510 | 153 | return true; |
ampembeng | 20:ee34856ae510 | 154 | } |
ampembeng | 20:ee34856ae510 | 155 | |
ampembeng | 20:ee34856ae510 | 156 | |
ampembeng | 20:ee34856ae510 | 157 | int HTS221::deactivate(void) |
ampembeng | 20:ee34856ae510 | 158 | { |
ampembeng | 20:ee34856ae510 | 159 | uint8_t data; |
ampembeng | 20:ee34856ae510 | 160 | |
ampembeng | 20:ee34856ae510 | 161 | data = readRegister(_address, CTRL_REG1); |
ampembeng | 20:ee34856ae510 | 162 | data &= ~POWER_UP; |
ampembeng | 20:ee34856ae510 | 163 | writeRegister(_address, CTRL_REG1, data); |
ampembeng | 20:ee34856ae510 | 164 | return true; |
ampembeng | 20:ee34856ae510 | 165 | } |
ampembeng | 20:ee34856ae510 | 166 | |
ampembeng | 20:ee34856ae510 | 167 | |
ampembeng | 20:ee34856ae510 | 168 | int |
ampembeng | 20:ee34856ae510 | 169 | HTS221::bduActivate(void) |
ampembeng | 20:ee34856ae510 | 170 | { |
ampembeng | 20:ee34856ae510 | 171 | uint8_t data; |
ampembeng | 20:ee34856ae510 | 172 | |
ampembeng | 20:ee34856ae510 | 173 | data = readRegister(_address, CTRL_REG1); |
ampembeng | 20:ee34856ae510 | 174 | data |= BDU_SET; |
ampembeng | 20:ee34856ae510 | 175 | writeRegister(_address, CTRL_REG1, data); |
ampembeng | 20:ee34856ae510 | 176 | |
ampembeng | 20:ee34856ae510 | 177 | return true; |
ampembeng | 20:ee34856ae510 | 178 | } |
ampembeng | 20:ee34856ae510 | 179 | |
ampembeng | 20:ee34856ae510 | 180 | |
ampembeng | 20:ee34856ae510 | 181 | int |
ampembeng | 20:ee34856ae510 | 182 | HTS221::bduDeactivate(void) |
ampembeng | 20:ee34856ae510 | 183 | { |
ampembeng | 20:ee34856ae510 | 184 | uint8_t data; |
ampembeng | 20:ee34856ae510 | 185 | |
ampembeng | 20:ee34856ae510 | 186 | data = readRegister(_address, CTRL_REG1); |
ampembeng | 20:ee34856ae510 | 187 | data &= ~BDU_SET; |
ampembeng | 20:ee34856ae510 | 188 | writeRegister(_address, CTRL_REG1, data); |
ampembeng | 20:ee34856ae510 | 189 | return true; |
ampembeng | 20:ee34856ae510 | 190 | } |
ampembeng | 20:ee34856ae510 | 191 | |
ampembeng | 20:ee34856ae510 | 192 | |
ampembeng | 20:ee34856ae510 | 193 | int |
ampembeng | 20:ee34856ae510 | 194 | HTS221::readHumidity(void) |
ampembeng | 20:ee34856ae510 | 195 | { |
ampembeng | 20:ee34856ae510 | 196 | uint8_t data = 0; |
ampembeng | 20:ee34856ae510 | 197 | uint16_t h_out = 0; |
ampembeng | 20:ee34856ae510 | 198 | double h_temp = 0.0; |
ampembeng | 20:ee34856ae510 | 199 | double hum = 0.0; |
ampembeng | 20:ee34856ae510 | 200 | |
ampembeng | 20:ee34856ae510 | 201 | data = readRegister(_address, STATUS_REG); |
ampembeng | 20:ee34856ae510 | 202 | |
ampembeng | 20:ee34856ae510 | 203 | if (data & HUMIDITY_READY) { |
ampembeng | 20:ee34856ae510 | 204 | data = readRegister(_address, HUMIDITY_H_REG); |
ampembeng | 20:ee34856ae510 | 205 | h_out = data << 8; // MSB |
ampembeng | 20:ee34856ae510 | 206 | data = readRegister(_address, HUMIDITY_L_REG); |
ampembeng | 20:ee34856ae510 | 207 | h_out |= data; // LSB |
ampembeng | 20:ee34856ae510 | 208 | |
ampembeng | 20:ee34856ae510 | 209 | // Decode Humidity |
ampembeng | 20:ee34856ae510 | 210 | hum = ((int16_t)(_h1_rH) - (int16_t)(_h0_rH))/2.0; // remove x2 multiple |
ampembeng | 20:ee34856ae510 | 211 | |
ampembeng | 20:ee34856ae510 | 212 | // Calculate humidity in decimal of grade centigrades i.e. 15.0 = 150. |
ampembeng | 20:ee34856ae510 | 213 | h_temp = (((int16_t)h_out - (int16_t)_H0_T0) * hum) / ((int16_t)_H1_T0 - (int16_t)_H0_T0); |
ampembeng | 20:ee34856ae510 | 214 | hum = ((int16_t)_h0_rH) / 2.0; // remove x2 multiple |
ampembeng | 20:ee34856ae510 | 215 | _humidity = (int16_t)((hum + h_temp)); // provide signed % measurement unit |
ampembeng | 20:ee34856ae510 | 216 | } |
ampembeng | 20:ee34856ae510 | 217 | return _humidity; |
ampembeng | 20:ee34856ae510 | 218 | } |
ampembeng | 20:ee34856ae510 | 219 | |
ampembeng | 20:ee34856ae510 | 220 | |
ampembeng | 20:ee34856ae510 | 221 | |
ampembeng | 20:ee34856ae510 | 222 | double |
ampembeng | 20:ee34856ae510 | 223 | HTS221::readTemperature(void) |
ampembeng | 20:ee34856ae510 | 224 | { |
ampembeng | 20:ee34856ae510 | 225 | uint8_t data = 0; |
ampembeng | 20:ee34856ae510 | 226 | uint16_t t_out = 0; |
ampembeng | 20:ee34856ae510 | 227 | double t_temp = 0.0; |
ampembeng | 20:ee34856ae510 | 228 | double deg = 0.0; |
ampembeng | 20:ee34856ae510 | 229 | |
ampembeng | 20:ee34856ae510 | 230 | data = readRegister(_address, STATUS_REG); |
ampembeng | 20:ee34856ae510 | 231 | |
ampembeng | 20:ee34856ae510 | 232 | if (data & TEMPERATURE_READY) { |
ampembeng | 20:ee34856ae510 | 233 | |
ampembeng | 20:ee34856ae510 | 234 | data= readRegister(_address, TEMP_H_REG); |
ampembeng | 20:ee34856ae510 | 235 | t_out = data << 8; // MSB |
ampembeng | 20:ee34856ae510 | 236 | data = readRegister(_address, TEMP_L_REG); |
ampembeng | 20:ee34856ae510 | 237 | t_out |= data; // LSB |
ampembeng | 20:ee34856ae510 | 238 | |
ampembeng | 20:ee34856ae510 | 239 | // Decode Temperature |
ampembeng | 20:ee34856ae510 | 240 | deg = ((int16_t)(_T1_degC) - (int16_t)(_T0_degC))/8.0; // remove x8 multiple |
ampembeng | 20:ee34856ae510 | 241 | |
ampembeng | 20:ee34856ae510 | 242 | // Calculate Temperature in decimal of grade centigrades i.e. 15.0 = 150. |
ampembeng | 20:ee34856ae510 | 243 | t_temp = (((int16_t)t_out - (int16_t)_T0_OUT) * deg) / ((int16_t)_T1_OUT - (int16_t)_T0_OUT); |
ampembeng | 20:ee34856ae510 | 244 | deg = ((int16_t)_T0_degC) / 8.0; // remove x8 multiple |
ampembeng | 20:ee34856ae510 | 245 | _temperature = deg + t_temp; // provide signed celsius measurement unit |
ampembeng | 20:ee34856ae510 | 246 | } |
ampembeng | 20:ee34856ae510 | 247 | |
ampembeng | 20:ee34856ae510 | 248 | return _temperature; |
ampembeng | 20:ee34856ae510 | 249 | } |
ampembeng | 20:ee34856ae510 | 250 |