获取lcd i2c地址

include

void
setup
(
)

{

Wire
.begin
(
)
;

Serial
.begin
(
9600
)
;
Serial
.println
(
"\nI2C Scanner"
)
;
}

void
loop
(
)

{

byte
error, address;
int
nDevices;

Serial
.println
(
"Scanning..."
)
;

nDevices = 0
;
for
(
address = 1
; address < 127
; address++ )

{

// The i2c_scanner uses the return value of

// the Write.endTransmisstion to see if

// a device did acknowledge to the address.

Wire
.beginTransmission
(
address)
;
error = Wire
.endTransmission
(
)
;

if
(
error == 0
)

{

Serial
.print
(
"I2C device found at address 0x"
)
;
if
(
address<16
)

Serial
.print
(
"0"
)
;
Serial
.print
(
address,HEX)
;
Serial
.println
(
" !"
)
;

nDevices++;
}

else
if
(
error==4
)

{

Serial
.print
(
"Unknow error at address 0x"
)
;
if
(
address<16
)

Serial
.print
(
"0"
)
;
Serial
.println
(
address,HEX)
;
}

}

if
(
nDevices == 0
)

Serial
.println
(
"No I2C devices found\n"
)
;
else

Serial
.println
(
"done\n"
)
;

delay
(
5000
)
; // wait 5 seconds for next scan

}