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11. Accelerometer
On board ADXL345 accelerometer is used to
measure acceleration in three axis: x- y- and z-.
The acceleromer’s function is dened by the user in
the program loaded into the microcontroller. Communication
between the accelerometer and the microcontroller is performed
over the I
2
C interface.
Figure 11-2: Accelerometer connection schematic
Figure 11-1:
Accelerometer
module
VCC-3.3
VCC-3.3
U9
VCC
GND
NC
GND
GND
VCC
CS
SCLK
SDO/ADR
SDI
NC
NC
INT2
INT1
VCC-3.3
C33
100nF
VCC-3.3
C32
100nF
ADXL345
SCL2-RA2
SDA2-RA3
SCL2-RA2
SDA2-RA3
J1
VCC-3.3
SDA2-RA3
SCL2-RA2
ACC ADDRESS
SMD JUMPER
VCC-3.3 VCC-3.3
R13
10K
R12
10K
E9
10uF
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