关于2块GY-30同时显示的问题
本帖最后由 smyhz 于 2016-9-15 00:00 编辑想用2个GY-30做个光照比较，但是改BH1750程序时，无法加入第二个BH1750
程序如下
//VCC-5v
//GND-GND
//SCL-SCL(A5)
//SDA-SDA(A4)
//ADD-GND ADD接VCC为0x5c ADD接GND为0x23
//*/
#include "Wire.h"
#include "math.h"
int BH1750address1 = 0x23;//BH1750 I2C地址、
int BH1750address2 = 0x5c;
byte buff;
void setup()
{
Wire.begin();
Serial.begin(9600);
}
void loop()
{
Serial.print( BH17501() );
Serial.print( “/” );
Serial.print( BH17502() );
Serial.println("");
}
double BH17501() //BH1750设备操作
double BH17502()
{
int ia = 0;
int ib = 0;
double vala = 0;
double valb = 0
//开始I2C读写操作
Wire.beginTransmission(BH1750address1);
Wire.beginTransmission(BH1750address2);
Wire.write(0x10);//1lx reolution 120ms//发送命令
Wire.endTransmission();
delay(200);
//读取数据
Wire.beginTransmission(BH1750address1);
Wire.beginTransmission(BH1750address2);
Wire.requestFrom(BH1750address1, 2);
Wire.requestFrom(BH1750address2, 2);
while (Wire.available()) //
{
buff = Wire.read(); // receive one byte
buff = Wire.read();
ia++;
ib++;
}
Wire.endTransmission();
if (2 == ia)
{
vala = ((buff << 8) | buff) / 1.2;
}
return vala;
if (2 == ib)
{
valb = ((buff << 8) | buff) / 1.2;
}
return vala;
}
主要是看不懂BH1750（）是从double里读取的还是其他地方读出来的
问题简介如下
gy-30:24: error: expected initializer before 'double'
double BH17502()
^
exit status 1
expected initializer before 'double'
谢谢各位大神了
好吧，没人回。。。
研究了好久终于弄好了
顺便发发
#include "Wire.h" //IIC库
#include "math.h"
int BH1750address1 = 0x23;//芯片地址为16位23
int BH1750address2 = 0x5c;
byte buff;
void setup()
{
Wire.begin();
Serial.begin(9600);
}
void loop()
{
int ia;
int ib;
int sumcd;
uint16_t vala = 0;
uint16_t valb = 0;
BH1750a_Init(BH1750address1);
BH1750b_Init(BH1750address2);
delay(1000);
if (2 == BH1750a_Read(BH1750address1))
{
vala = ((buff << 8) | buff) / 12 - 3;
}
if (2 == BH1750b_Read(BH1750address2))
{
valb = ((buff << 8) | buff) / 12;
}
delay(150);
Serial.print(vala, DEC);
Serial.print("/");
Serial.print(valb, DEC);
Serial.println("");
}
int BH1750a_Read(int address1) //
{
int ia = 0;
Wire.beginTransmission(address1);
Wire.requestFrom(address1, 2);
while (Wire.available()) //
{
buff = Wire.read();// read one byte
ia++;
}
Wire.endTransmission();
return ia;
}
int BH1750b_Read(int address2) //
{
int ib = 0;
Wire.beginTransmission(address2);
Wire.requestFrom(address2, 2);
while (Wire.available()) //
{
buff = Wire.read();// read one byte
ib++;
}
Wire.endTransmission();
return ib;
}
void BH1750a_Init(int address1)
{
Wire.beginTransmission(address1);
Wire.write(0x10);//1lx reolution 120ms
Wire.endTransmission();
}
void BH1750b_Init(int address2)
{
Wire.beginTransmission(address2);
Wire.write(0x10);//1lx reolution 120ms
Wire.endTransmission();
} 请问这个芯片地址是怎么确定的？我很想请教下
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