Example of temperature limit detection for STTS751 in X-NUCLEO-IKS01A3
Dependencies: X_NUCLEO_IKS01A3
Temperature Limit Demo Application with STTS751 based on sensor expansion board X-NUCLEO-IKS01A3
Main function is to show how to detect exceeding of temperature limits using the sensor expansion board and send a notification using UART to a connected PC or Desktop and display it on terminal applications like TeraTerm.
After connection has been established:
- the user can heat up or cool down the board and view the data using an hyper terminal.
Diff: main.cpp
- Revision:
- 0:1399adb8f248
- Child:
- 3:3c8bce3cdf2f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Wed Mar 06 13:35:38 2019 +0000 @@ -0,0 +1,161 @@ +/** + ****************************************************************************** + * @file main.cpp + * @author SRA + * @version V1.0.0 + * @date 5-March-2019 + * @brief Simple Example application for using the X_NUCLEO_IKS01A3 + * MEMS Inertial & Environmental Sensor Nucleo expansion board. + ****************************************************************************** + * @attention + * + * <h2><center>© COPYRIGHT(c) 2019 STMicroelectronics</center></h2> + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. Neither the name of STMicroelectronics nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************** +*/ + +/* Includes */ +#include "mbed.h" +#include "XNucleoIKS01A3.h" + +/* Instantiate the expansion board */ +static XNucleoIKS01A3 *mems_expansion_board = XNucleoIKS01A3::instance(D14, D15, D4, D5, A3, D6, A4); + +/* Retrieve the composing elements of the expansion board */ +static STTS751Sensor *t_sensor = mems_expansion_board->t_sensor; + +DigitalOut myled(LED1); + +volatile int mems_event = 0; +uint32_t previous_tick = 0; +uint32_t current_tick = 0; +uint8_t high = 0, low = 0; +float temperature = 0.0f; +char buffer[32]; + +void INT_cb(); + +/* Helper function for printing floats & doubles */ +static char *print_double(char* str, double v, int decimalDigits=2) +{ + int i = 1; + int intPart, fractPart; + int len; + char *ptr; + + /* prepare decimal digits multiplicator */ + for (;decimalDigits!=0; i*=10, decimalDigits--); + + /* calculate integer & fractinal parts */ + intPart = (int)v; + fractPart = (int)((v-(double)(int)v)*i); + + /* fill in integer part */ + sprintf(str, "%i.", intPart); + + /* prepare fill in of fractional part */ + len = strlen(str); + ptr = &str[len]; + + /* fill in leading fractional zeros */ + for (i/=10;i>1; i/=10, ptr++) { + if (fractPart >= i) { + break; + } + *ptr = '0'; + } + + /* fill in (rest of) fractional part */ + sprintf(ptr, "%i", fractPart); + + return str; +} + +/* Simple main function */ +int main() { + /* Attach callback to STTS751 INT */ + t_sensor->attach_int_irq(&INT_cb); + + /* Enable STTS751 accelerometer */ + t_sensor->enable(); + /* Set ODR to 4Hz */ + t_sensor->set_odr(4.0f); + /* Set Low Temperature Threshold */ + t_sensor->set_low_temp_thr(22.0f); + /* Set High Temperature Threshold */ + t_sensor->set_high_temp_thr(28.0f); + /* Enable Event pin */ + t_sensor->set_event_pin(1); + /* Get beginning status */ + t_sensor->get_temp_limit_status(NULL, NULL, NULL); + + previous_tick = clock(); + + printf("\r\n--- Starting new run ---\r\n"); + + while(1) { + if (mems_event) { + mems_event=0; + uint8_t high_temp = 0, low_temp = 0; + t_sensor->get_temp_limit_status(&high_temp, &low_temp, NULL); + if (high_temp){ + high = 1; + low = 0; + } + if (low_temp){ + low = 1; + high = 0; + } + + t_sensor->get_temperature(&temperature); + myled = 1; + wait(0.1); + myled = 0; + } + + current_tick = clock(); + if (((current_tick - previous_tick)/CLOCKS_PER_SEC) >= 2){ + if (!high && !low){ + t_sensor->get_temperature(&temperature); + } + printf("Temp[C]: "); + printf("%7s C", print_double(buffer, temperature)); + if (high){ + printf(" High temperature detected!(>28C) \r\n"); + high = 0; + } else if (low) { + printf(" Low temperature detected!(<22C) \r\n"); + low = 0; + } else { + printf("\r\n"); + } + previous_tick = clock(); + } + } +} + +void INT_cb() { + mems_event = 1; +}