54
A
A
X
X
4
4
B
B
E
E
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
G
G
P
P
O
O
(
(
G
G
e
e
n
n
e
e
r
r
a
a
l
l
P
P
u
u
r
r
p
p
o
o
s
s
e
e
O
O
u
u
t
t
p
p
u
u
t
t
)
)
C
C
o
o
n
n
n
n
e
e
c
c
t
t
o
o
r
r
GPO (General Purpose Output)
is an advanced specification developed by AOpen for power users to define the further
function by oneself. For example, you can design a daughter board to provide additional capabilities, such as an alarm, a buzzer,
a timekeeper, etc.
2 6
GPO24
NC
GPO27
3.3V
GPO28
GND
1 5
