The "Sensors Reader" program is a more complex example of how to use the X-NUCLEO-IKS01A1 expansion board featuring among others:

• Support for LSM6DS3 3D Accelerometer & Gyroscope (on DIL 24-pin socket) including free-fall detection
• Usage of LED & Ticker
• Exploitation of wait for event
• (Top-/Bottom-Half) Interrupt handling

The expansion board features also a DIL 24-pin socket which makes it possible to add further MEMS adapters and other sensors (e.g. UV index).

It is intentionally implemented as a singleton because only one X_NUCLEO_IKS01A1 at a time might be deployed in a HW component stack. In order to get the singleton instance you have to call class method `Instance()`, e.g.:

// Sensors expansion board singleton instance
static X_NUCLEO_IKS01A1 *sensors_expansion_board = X_NUCLEO_IKS01A1::Instance();

To read the data from the sensor, you need call the corresponding function of the composing elements:

static TempSensor *temp_sensor1 = mems_expansion_board->ht_sensor;
static HumiditySensor *humidity_sensor = mems_expansion_board->ht_sensor;

float value1, value2;
temp_sensor1->GetTemperature(&value1);
humidity_sensor->GetHumidity(&value2);
printf("HTS221: [temp] %7s°C,   [hum] %s%%\r\n", printDouble(buffer1, value1), printDouble(buffer2, value2));

Furthermore, library ST_INTERFACES contains all abstract classes which together constitute the common API to which all existing and future ST components will adhere to.

Setup¶

First, attach the X-NUCLEO-IKS01A1 to the STM32 Nucleo platform and then connect them to your PC using micro USB cable as shown here:

Compile and Run¶

1. Import Program2_SensorReader to your online compiler.
2. Compile and load the bin file to 'NODE_F429ZI' disk. Then reset the board to run the program.
3. Open your terminal window to see the output information (set the baud rate to 9600).
4. Now you should see the sensor values from device including temperature, humidity, pressure...! You can put you hand on the shield for a while. The temperature and humidity will soon get higher.