Selvakumar Samuel / Mbed 2 deprecated SensorsProgramming

Exercise4

Dependencies:   mbed Nucleo_Sensor_Shield

main.cpp@1:be2eea2ae8e7, 2018-02-08 (annotated)

Committer:
kennethwfk
Date:
Thu Feb 08 08:11:12 2018 +0000
Revision:
1:be2eea2ae8e7
Parent:
0:fc777b6c55d6 
First draft for demo;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kennethwfk 0:fc777b6c55d6 1 /*----------------------------------------------------------------------------
kennethwfk 0:fc777b6c55d6 2 LAB EXERCISE - Environmental sensors measurments
kennethwfk 0:fc777b6c55d6 3 ----------------------------------------
kennethwfk 0:fc777b6c55d6 4 In this exercise we will read the environmental sensors on the Nucleo sensors shield (X-NUCLEO-IKS01A1)
kennethwfk 0:fc777b6c55d6 5 with the help of the ST Nucleo Sensor Shield library which is compatible with the MBED API.
kennethwfk 0:fc777b6c55d6 6 Then we will send the measurements via USB to our PC using serial communication.
kennethwfk 0:fc777b6c55d6 7 We can then display the results using a terminal emulation program (e.g. Termite).
kennethwfk 0:fc777b6c55d6 8
kennethwfk 0:fc777b6c55d6 9 At the same time the program blinks the on board LED to show alivness.
kennethwfk 0:fc777b6c55d6 10
kennethwfk 0:fc777b6c55d6 11
kennethwfk 0:fc777b6c55d6 12 GOOD LUCK!
kennethwfk 0:fc777b6c55d6 13 *----------------------------------------------------------------------------*/
kennethwfk 0:fc777b6c55d6 14
kennethwfk 0:fc777b6c55d6 15 #include "mbed.h"
kennethwfk 0:fc777b6c55d6 16 #include "x_cube_mems.h"
kennethwfk 0:fc777b6c55d6 17
kennethwfk 0:fc777b6c55d6 18 // Create a DigitalOut objects for the LED
kennethwfk 0:fc777b6c55d6 19 DigitalOut led(LED1);
kennethwfk 0:fc777b6c55d6 20
kennethwfk 0:fc777b6c55d6 21 // Create a Serial objects to communicate via USB
kennethwfk 0:fc777b6c55d6 22 Serial pc(USBTX, USBRX);
kennethwfk 0:fc777b6c55d6 23
kennethwfk 0:fc777b6c55d6 24 // Create 2 Ticker objects for a recurring interrupts. One for blink a LED and the other one to update the sensor lectures periodicly.
kennethwfk 0:fc777b6c55d6 25 Ticker blinky;
kennethwfk 0:fc777b6c55d6 26 Ticker update;
kennethwfk 0:fc777b6c55d6 27
kennethwfk 0:fc777b6c55d6 28 volatile float TEMPERATURE_C;
kennethwfk 0:fc777b6c55d6 29 volatile float TEMPERATURE_F;
kennethwfk 0:fc777b6c55d6 30 volatile float TEMPERATURE_K;
kennethwfk 0:fc777b6c55d6 31 volatile float HUMIDITY;
kennethwfk 0:fc777b6c55d6 32 volatile float PRESSURE;
kennethwfk 0:fc777b6c55d6 33
kennethwfk 0:fc777b6c55d6 34 bool measurements_update = false;
kennethwfk 0:fc777b6c55d6 35
kennethwfk 0:fc777b6c55d6 36 void blinky_handler(){
kennethwfk 0:fc777b6c55d6 37 led = !led;
kennethwfk 0:fc777b6c55d6 38 }
kennethwfk 0:fc777b6c55d6 39
kennethwfk 0:fc777b6c55d6 40 void sensors_handler(){
kennethwfk 0:fc777b6c55d6 41 measurements_update = true;
kennethwfk 0:fc777b6c55d6 42 }
kennethwfk 0:fc777b6c55d6 43
kennethwfk 0:fc777b6c55d6 44 int main() {
kennethwfk 0:fc777b6c55d6 45
kennethwfk 0:fc777b6c55d6 46 /* Create a sensor shield object */
kennethwfk 0:fc777b6c55d6 47 static X_CUBE_MEMS *Sensors = X_CUBE_MEMS::Instance();
kennethwfk 0:fc777b6c55d6 48
kennethwfk 0:fc777b6c55d6 49 /* Attach a function to be called by the Ticker objects at a specific interval in seconds*/
kennethwfk 0:fc777b6c55d6 50 blinky.attach(&blinky_handler, 0.5);
kennethwfk 0:fc777b6c55d6 51 update.attach(&sensors_handler, 3);
kennethwfk 0:fc777b6c55d6 52
kennethwfk 0:fc777b6c55d6 53 while(1) {
kennethwfk 0:fc777b6c55d6 54
kennethwfk 0:fc777b6c55d6 55 if(measurements_update == true){
kennethwfk 0:fc777b6c55d6 56 /* Read the environmental sensors */
kennethwfk 0:fc777b6c55d6 57 Sensors->hts221.GetTemperature((float *)&TEMPERATURE_C);
kennethwfk 0:fc777b6c55d6 58 Sensors->hts221.GetHumidity((float *)&HUMIDITY);
kennethwfk 0:fc777b6c55d6 59 Sensors->lps25h.GetPressure((float *)&PRESSURE);
kennethwfk 0:fc777b6c55d6 60
kennethwfk 0:fc777b6c55d6 61 TEMPERATURE_F = (TEMPERATURE_C * 1.8f) + 32.0f; //Convert the temperature from Celsius to Fahrenheit
kennethwfk 0:fc777b6c55d6 62 TEMPERATURE_K = (TEMPERATURE_C + 273.15f); //Convert the temperature from Celsius to Kelvin
kennethwfk 0:fc777b6c55d6 63 pc.printf("Temperature:\t %.2f C / %.2f F / %.2f K\r\n", TEMPERATURE_C, TEMPERATURE_F, TEMPERATURE_K);
kennethwfk 0:fc777b6c55d6 64 pc.printf("Humidity:\t %.2f%%\r\n", HUMIDITY);
kennethwfk 0:fc777b6c55d6 65 pc.printf("Pressure:\t %.2f hPa\r\n", PRESSURE);
kennethwfk 0:fc777b6c55d6 66
kennethwfk 0:fc777b6c55d6 67 pc.printf("\r\n");
kennethwfk 0:fc777b6c55d6 68
kennethwfk 0:fc777b6c55d6 69 measurements_update = false;
kennethwfk 0:fc777b6c55d6 70 }
kennethwfk 0:fc777b6c55d6 71 __wfi();
kennethwfk 0:fc777b6c55d6 72 }
kennethwfk 0:fc777b6c55d6 73 }