Graphical User Interface

UM0285

14/32

controller. The device, in fact, may be programmed to generate an interrupt signal when a tilt

is detected and to return the information of the direction in which the sensor has been tilted.

With the same feature the LIS3LV02DL sensor is able to return the information about the

spatial orientation of the board without requiring the reading and the further post-processing

of the acceleration data.

This feature is demonstrated through the Direction Detection demo mode panel (Figure 11)

which is activated by clicking on the “Dir Detect” button present in the main GUI window.

Figure 11.

EK Demo Mode window

In order to configure the event which will trigger the interrupt event, the user must select the

desired inner/internal and outer/external threshold (ref1), defining in this way an hysteresis

region that allows to avoid false detections and/or bouncing produced for example by either

spurious vibration or tremor. Whenever the inner thresholds is greater than the outer one,

the hysteresis region will be null and the threshold employed to detect the tilt direction will be

the outer one. A graphical representation of the internal and external thresholds is given in

Figure 12.

Whenever the absolute value of the acceleration signal measured by the sensor either

exceeds the outer threshold or returns below the inner threshold an interrupt signal will be

generated and the General Purpose green LED will blink.

If the user wants to detect the orientation changes removing the DC level of the acceleration

signal applied to the device (i.e. removing the gravity vector), it is possible to enable the High

Pass Filter embedded inside the device by acting on the “High Pass Filter” pop-up menu

(Figure 11, ref2). The cut-off frequency of the filter, which is shown

inside the Cutoff

and on the Output Data Rate (ODR). For further details, please refer to AN2381.

To start the Direction Detection demo mode click on “Start Direction Detection” (ref4).

ref1

ref4

ref3

ref2

ref5