Accelerometer trigger
Overview
This sample application demonstrates how to use 3-Axis accelerometers with triggers. By default it uses a data ready trigger to read the accelerometer data and print it to the console.
If the accelerometer is enabled with a tap trigger, the sample uses the tap trigger event to read the accelerometer data and print it to the console.
Building and Running
/ {
aliases {
accel0 = &fxos8700;
};
};
Make sure the aliases are in devicetree, then build and run with:
west build -b <board to use> samples/sensor/accel_trig
west flash
With this example, you can also detect a double tap with an accelerometer by activating the
CONFIG_SAMPLE_TAP_DETECTION.
In this example we use a x_nucleo_iks01a3 shield with a LIS2DW12 accelerometer.
You can build it with the following command:
west build -b nrf52dk/nrf52832 --extra-dtc-overlay x_nucleo_iks01a3.overlay --shield x_nucleo_iks01a3 samples/sensor/accel_trig
Sample Output (SENSOR_TRIG_DATA_READY)
fxos8700@1d [m/s^2]: ( -0.153229, -0.057461, 9.931148)
fxos8700@1d [m/s^2]: ( -0.153229, -0.057461, 9.931148)
fxos8700@1d [m/s^2]: ( -0.143653, -0.057461, 9.921571)
fxos8700@1d [m/s^2]: ( -0.153229, -0.067038, 9.931148)
fxos8700@1d [m/s^2]: ( -0.143653, -0.067038, 9.921571)
fxos8700@1d [m/s^2]: ( -0.134076, -0.047885, 9.931148)
fxos8700@1d [m/s^2]: ( -0.105345, -0.038308, 9.940725)
fxos8700@1d [m/s^2]: ( -0.105345, -0.019154, 9.931148)
fxos8700@1d [m/s^2]: ( -0.105345, -0.028731, 9.921571)
fxos8700@1d [m/s^2]: ( -0.095769, -0.028731, 9.931148)
fxos8700@1d [m/s^2]: ( -0.095769, -0.009577, 9.940725)
Sample Output (SENSOR_TRIG_DOUBLE_TAP)
TAP detected
lis2dw12@19 [m/s^2]: ( -1.899901, -12.550355, -2.742174)
TAP detected
lis2dw12@19 [m/s^2]: ( 12.349357, -18.125630, 6.015556)
TAP detected
lis2dw12@19 [m/s^2]: ( -11.385050, -7.274181, -9.229117)
TAP detected
lis2dw12@19 [m/s^2]: ( 9.214760, -9.286545, 2.311466)
TAP detected
lis2dw12@19 [m/s^2]: ( 10.090533, -17.391034, 12.320643)
TAP detected
lis2dw12@19 [m/s^2]: ( -0.478564, 2.390429, 15.876378)
TAP detected
lis2dw12@19 [m/s^2]: ( -5.668596, -13.138989, 0.741775)
TAP detected
lis2dw12@19 [m/s^2]: ( -2.385644, -10.559526, 9.899107)
TAP detected
lis2dw12@19 [m/s^2]: ( 7.537391, -8.551948, 16.740187)