Sensors; Accelerometer - Libelium Waspmote Technical Manual

8. Sensors

8.1. Accelerometer

Waspmote has a built-in acceleration sensor LIS3331LDH, by STMicroelectronics, which informs the mote of
acceleration variations experienced on each one of the 3 axes (X,Y, Z).
The integration of this sensor allows the measurement of acceleration on the 3 axes (X, Y, Z), establishing 4 kinds
of events: Free Fall, inertial wake up, 6D movement and 6D position which are explained in the Interruption
Programming Guide.
The LIS331DLH has dynamically user-selectable full scales of ±2g/±4g/±8g and it is capable of measuring
accelerations with output data rates from 0.5 Hz to 1 kHz.
The device features ultra low-power operational modes that allow advanced power saving and smart sleep to
wake-up functions.
The accelerometer has several power modes, the output data rate (ODR) will depend on the power mode selected.
The power modes and output data rates are shown in this table:
This accelerometer has an auto-test capability that allows the user to check the functioning of the sensor in the
final application. Its operational temperature range is between -40 ºC and +85 ºC.
The accelerometer communicates with the microcontroller through the I2C interface. The pins that are used for
this task are the SCL pin and the SDA pin, as well as another interruption pin to generate the interruptions.
Power mode
Power down
Normal mode
Low-power 1
Low-power 2
Low-power 3
Low-power 4
Low-power 5
Output data rate (Hz)
--
1000
0.5
1
2
5
10
-72-
Sensors
v8.2