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C32
100nF
C33
100nF
VCC-3.3
R12
10K
R13
10K
VCC-3.3
1
2
3
J1
ACC ADDRESS
1
2
3
VCC
GND
Res
4
GND
5
GND
6
VCC
7
CS
8
INT1
9
INT2
10
NC
11
Res
12
ADD
13
SDA
14
SCL
U9
ADXL345
VCC-3.3
VCC-3.3
VCC-3.3
SCL1-RG2
SDA1-RG3
VCC-3.3
VREF-1.8
C31
22pF
C30
22pF
X3
32.768KHz
C2
22pF
C1
22pF
X1
8MHz
E9
10uF
SDA1-RG3
SCL1-RG2
SOSCO
SOSCI
CLKO
CLKI
30
29
28
27
34
33
58
57
56
55
54
53
52
46
36
35
42 43 44 45
37
50
9
48 49
11
12
32
72
69
68
67
66
65
64
63
4
3
78 77
24
23
18
17
16
15
14
13
5
6
7
8
10
79
80
1
2
22
21
20
19
62
61
60
59
38 39 40 41
47
71
31
51
70
26
25
76
75
74
73
dsPIC33FJ256GP710A
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
10
0
R
B1
1
R
B10
/A
N
10
R
B9
/A
N
9
R
B8
/A
N
8
R
B1
3
R
B1
2
RE7
RC1
RC2
RC3
RA15
SCL1/RG2
R
B1
5
R
B1
4
SDO1/RF8
SDI1/RF7
SCK1/RF6
SDA1/RG3
G
N
D
VC
C
R
A6
R
G
0
R
G
1
R
E0
R
F1
R
F0
R
D
7
R
D
6
RE6
RE5
R
E2
R
G
13
R
G
12
R
G
14
R
E1
R
A7
RG8/SDO2
R
A9
/V
re
f-
RB1
RB2/AN2
RB3
RB4
RB5
RA13
RD9
RD8
U1RX/RF2
U1TX/RF3
GND
RG7/SDI2
RG6/SCK2
R
A1
R
E3
R
E4
RG15
VCC
R
B7
/P
G
ED
1
R
B6
/P
G
EC1
RB0
R
F4
R
F5
RA14
RA5
R
D
14
R
D
15
RA2
R
F1
3
VC
C
RA3
VCC
VC
C
RA12
RA0
VCC
G
N
D
R
F1
2
RA4
GND
VCA
P
AG
N
D
AV
CC
R
A1
0/
Vr
ef
+
MCLR
RC4
CLKI/RC12
CLKO/RC15
RD10
R
D
3
R
D
1
SOSCI/RC13
SOSCO/RC14
GND
R
D
2
R
D
12
R
D
13
R
D
4
R
D
5
RG9
RD11
RD0
U1
C5
100nF
C6
100nF
C7
100nF
E8
10uF
VCC-3.3 VCC-3.3 VCC-3.3
VCC-3.3
C8
100nF
VCC-3.3
decoupling capacitors
10. Accelerometer
On board
ADXL345
accelerometer is used to
measure acceleration in three axis: x, y and z. The
accelerometer’s function is defined by the user in the
program loaded into the microcontroller. Communication
between the accelerometer and the microcontroller is performed
via the
I2C
interface.
You can set the accelerometer
address to 0 or 1 by re-soldering the
SMD jumper (zero-ohm resistor) to the
appropriate position. Jumper is placed
in address 1 position by default.
Figure 10-2:
Accelerometer
connection
schematics
Figure 10-1:
Accelerometer
module
