/*
【Arduino】66种传感器模块系列实验（68）
实验六十八：BMP180 新款 BOSCH温度模块气压传感器（代替BMP085）
程序之二，气温、气压与海拔值可以调整并校准
*/
#include <Wire.h>
#define BMP180ADD 0x77
unsigned char OSS;
int ac1;
int ac2;
int ac3;
unsigned int ac4;
unsigned int ac5;
unsigned int ac6;
int b1;
int b2;
int mb;
int mc;
int md;
float temperature;
double pressure;
double pressure2;
long b5;
double altitude;
void setup()
{
Serial.begin(9600);
Wire.begin();
OSS = 2;
BMP180start();
}
void loop()
{
calculate();
show();
delay(1000);
}
void calculate()
{
temperature = bmp180GetTemperature(bmp180ReadUT());
temperature = temperature*0.0137;
pressure = bmp180GetPressure(bmp180ReadUP());
pressure2 = pressure/115325;
pressure2 = pow(pressure2,0.29029496);
altitude = 39*(1+pressure2);
}
void show()
{
Serial.print("气温: ");
Serial.print(temperature, 1);
Serial.println(" C");
Serial.print("气压: ");
Serial.print(pressure, 0);
Serial.println(" Pa");
Serial.print("海拔:");
Serial.print(altitude);
Serial.println("m");
}
void BMP180start()
{
ac1 = bmp180ReadDate(0xAA);
ac2 = bmp180ReadDate(0xAC);
ac3 = bmp180ReadDate(0xAE);
ac4 = bmp180ReadDate(0xB0);
ac5 = bmp180ReadDate(0xB2);
ac6 = bmp180ReadDate(0xB4);
b1= bmp180ReadDate(0xB6);
b2= bmp180ReadDate(0xB8);
mb= bmp180ReadDate(0xBA);
mc= bmp180ReadDate(0xBC);
md= bmp180ReadDate(0xBE);
}
short bmp180GetTemperature(unsigned int ut)
{
long x1, x2;
x1 = (((long)ut - (long)ac6)*(long)ac5) >> 15;
x2 = ((long)mc << 11)/(x1 + md);
b5 = x1 + x2;
return ((b5 + 8)>>4);
}
long bmp180GetPressure(unsigned long up)
{
long x1, x2, x3, b3, b6, p;
unsigned long b4, b7;
b6 = b5 - 4000;
x1 = (b2 * (b6 * b6)>>12)>>11;
x2 = (ac2 * b6)>>11;
x3 = x1 + x2;
b3 = (((((long)ac1)*4 + x3)<<OSS) + 2)>>2;
x1 = (ac3 * b6)>>13;
x2 = (b1 * ((b6 * b6)>>12))>>16;
x3 = ((x1 + x2) + 2)>>2;
b4 = (ac4 * (unsigned long)(x3 + 32768))>>15;
b7 = ((unsigned long)(up - b3) * (50000>>OSS));
if (b7 < 0x80000000)
p = (b7<<1)/b4;
else
p = (b7/b4)<<1;
x1 = (p>>8) * (p>>8);
x1 = (x1 * 3038)>>16;
x2 = (-7357 * p)>>16;
p += (x1 + x2 + 3791)>>4;
return p;
}
int bmp180Read(unsigned char address)
{
unsigned char data;
Wire.beginTransmission(BMP180ADD);
Wire.write(address);
Wire.endTransmission();
Wire.requestFrom(BMP180ADD, 1);
while(!Wire.available());
return Wire.read();
}
int bmp180ReadDate(unsigned char address)
{
unsigned char msb, lsb;
Wire.beginTransmission(BMP180ADD);
Wire.write(address);
Wire.endTransmission();
Wire.requestFrom(BMP180ADD, 2);
while(Wire.available()<2);
msb = Wire.read();
lsb = Wire.read();
return (int) msb<<8 | lsb;
}
unsigned int bmp180ReadUT()
{
unsigned int ut;
Wire.beginTransmission(BMP180ADD);
Wire.write(0xF4);
Wire.write(0x2E);
Wire.endTransmission();
delay(5);
ut = bmp180ReadDate(0xF6);
return ut;
}
unsigned long bmp180ReadUP()
{
unsigned char msb, lsb, xlsb;
unsigned long up = 0;
Wire.beginTransmission(BMP180ADD);
Wire.write(0xF4);
Wire.write(0x34 + (OSS<<6));
Wire.endTransmission();
delay(2 + (3<<OSS));
Wire.beginTransmission(BMP180ADD);
Wire.write(0xF6);
Wire.endTransmission();
Wire.requestFrom(BMP180ADD, 3);
while(Wire.available() < 3);
msb = Wire.read();
lsb = Wire.read();
xlsb = Wire.read();
up = (((unsigned long) msb << 16) | ((unsigned long) lsb << 8) | (unsigned long) xlsb) >> (8-OSS);//16 to 19 bit
return up;
}
/*
【Arduino】66种传感器模块系列实验（68）
实验六十八：BMP180 新款 BOSCH温度模块气压传感器（代替BMP085）
程序之三，温度、实时气压、已知海拔计算的海平面的气压、已知海平面气压计算的高度
只是算法有点烂，做做实验而已
*/
#include <SFE_BMP180.h>
#include <Wire.h>
SFE_BMP180 pressure;
#define ALTITUDE 255.0
unsigned long gpstimes;
void setup()
{
Serial.begin(9600);
pressure.begin();
}
void loop()
{
gpstimes=millis();
char status;
double T,P,p0,a;
status = pressure.startTemperature();
delay(status);
status = pressure.getTemperature(T);
delay(status);
Serial.print("temperature: ");
Serial.print(T,2);
Serial.println(" deg C, ");
status = pressure.startPressure(3);
delay(status);
status = pressure.getPressure(P,T);
// Print out the measurement:
Serial.print("absolute pressure A: ");
Serial.print(P,2);
Serial.println(" mb, ");
p0=1013.2;
a = pressure.altitude(P,p0);
Serial.print("computed altitude A: ");
Serial.print(a,0);
Serial.println(" meters, ");
T=25.00;
status = pressure.getPressure(P,T);
Serial.print("absolute pressure B: ");
Serial.print(P,2);
Serial.println(" mb, ");
p0=1013.2;
a = pressure.altitude(P,p0);
Serial.print("computed altitude B: ");
Serial.print(a,0);
Serial.println(" meters, ");
gpstimes=millis()-gpstimes;
Serial.print("gpstimes=");
Serial.println(gpstimes);
Serial.println();
delay(2000);
}
实验六十九： AT24C256 I2C接口 EEPROM 存储模块 IIC
AT24C256
是ATMEL公司256kbit串行电可擦的可编程只读存储器，8引脚双排直插式封装，具有结构紧凑、存储容量大等特点，可以在2线总线上并接4片该IC，特别适用于具有高容量数据储存要求的数据采集系统。AT24C256采用SOP-8封装。
芯片参数
芯片有3种工作电压；
5.0V（VCC=4.5V～5.5V）
2.7V（VCC=2.7V～5.5V）
1.8V（VCC=1.8V～3.6V）
特性：
内部可以组成32k×8存储单元
2线串行接口
斯密特触发，滤波输入抑制噪声
双向数据传送协议
硬件写保护引脚和软件数据保护功能
具有64字节页写模式
A0、A1：地址选择输入端。在串行总线结构中，可以连接4个AT24C256IC。用A0、A1来区分各IC。A0、A1悬空时为0。
SCL：串行时钟输入。上升沿将SDA上的数据写入存储器，下降沿从存储器读出数据送SDA上。
SDA：双向串行数据输入输出口。用于存储器与单片机之间的数据交换。
WP：写保护输入。此引脚与地相连时，允许写操作；与VCC相连时，所有的写存储器操作被禁止。如果不连，芯片内部下拉到地。
VCC：电源。
GND：地。
NC：空。
AT24C256的工作原理
AT24C256内部有512页，每一页为64字节，任一单元的地址为15位。地址范围0000H～7FFFH。
芯片工作状态
1）时钟和数据传送
一般情况下，SDA被外部的设备拉到高，只有当SCL为低电平时，SDA上的数据变化，表示要传送数据。SCL为高时SDA变化表示状态变化。
2）开始状态（START）
当SCL为高时，SDA由高到低表示数据传送开始，这一状态必须在所有命令之前。
3）结束状态（STOP）
当SCL为高时，SDA由低到高表示数据传送结束状态。
4）应答状态（ACK）
所有的地址和数据都是以8位的形式串行传送给存储器或从存储器读出的。存储器在第9个时钟周期SDA发零信号表示已经收到8位数据。见图总线协议图。
AT24C256 I2C接口 EEPROM 存储模块
1.板载芯片AT24C256进口芯片；
2.板载I2C通讯所需的上拉电阻；
3.所有管脚均引出并标注；
4.PCB板子尺寸：1.9(CM)x1.1(CM)
模块电原理图
/*
【Arduino】66种传感器模块系列实验（69）
实验六十九： AT24C256 I2C接口 EEPROM 存储模块
*/
#include <Wire.h>
#define ADDRESS_AT24C256 0x50
word wordAddress = 0x0F00;
char str[] = "This is ZLBG.";
byte buffer;
int i;
void setup()
{
Wire.begin();
Serial.begin(9600);
//write
Wire.beginTransmission(ADDRESS_AT24C256);
Wire.write(highByte(wordAddress));
Wire.write(lowByte(wordAddress));
for (i = 0; i < sizeof(str); i++)
{
Wire.write(byte(str));
}
Wire.endTransmission();
delay(10);
}
void loop()
{
Wire.beginTransmission(ADDRESS_AT24C256);
Wire.write(highByte(wordAddress));
Wire.write(lowByte(wordAddress));
Wire.endTransmission();
Wire.requestFrom(ADDRESS_AT24C256, sizeof(str));
if(Wire.available() >= sizeof(str))
{
for (i = 0; i < sizeof(str); i++)
{
buffer = Wire.read();
}
}
for(i = 0; i < sizeof(str); i++)
{
Serial.print(char(buffer));
}
Serial.println();
delay(2000);
}
/*
【Arduino】66种传感器模块系列实验（69）
实验六十九： AT24C256 I2C接口 EEPROM 存储模块
程序之二
*/
#include <Wire.h>
#define EEPROM_ADDR 0x50
void setup()
{
Wire.begin();
Serial.begin(9600);
// TESTS FOR EACH FUNCTION BEGIN HERE
Serial.println("Writing Test:");
for (int i=0; i<20; i++){
i2c_eeprom_write_byte(EEPROM_ADDR,i,i+65);
Serial.print(". ");
delay(10);
}
Serial.println("");
delay(500);
Serial.println("Reading Test:");
for (int i=0; i<20; i++){
Serial.write(i2c_eeprom_read_byte(EEPROM_ADDR, i));
Serial.print(" ");
}
byte PageData;
byte PageRead;
for (int i=0; i<30; i++){
PageData = 0;
PageRead = 0;
}
Serial.println("");
for (int i=0; i<30; i++) PageData = i+33;
Serial.println("Writing Page Test:");
i2c_eeprom_write_page(EEPROM_ADDR, 100, PageData, 28 );
Serial.println("Reading Page Test:");
i2c_eeprom_read_buffer( EEPROM_ADDR, 100, PageRead, 28);
for (int i=0; i<28; i++){
Serial.write(PageRead);
Serial.print(" ");
}
}
void loop()
{
}
void i2c_eeprom_write_byte( int deviceaddress, unsigned int eeaddress, byte data )
{
int rdata = data;
Wire.beginTransmission(deviceaddress);
Wire.write((int)(eeaddress >> 8));
Wire.write((int)(eeaddress & 0xFF));
Wire.write(rdata);
Wire.endTransmission();
}
void i2c_eeprom_write_page
( int deviceaddress, unsigned int eeaddresspage, byte* data, byte length )
{
Wire.beginTransmission(deviceaddress);
Wire.write((int)(eeaddresspage >> 8));
Wire.write((int)(eeaddresspage & 0xFF));
byte c;
for ( c = 0; c < length; c++)
Wire.write(data);
Wire.endTransmission();
delay(10);
}
byte i2c_eeprom_read_byte( int deviceaddress, unsigned int eeaddress )
{
byte rdata = 0xFF;
Wire.beginTransmission(deviceaddress);
Wire.write((int)(eeaddress >> 8));
Wire.write((int)(eeaddress & 0xFF));
Wire.endTransmission();
Wire.requestFrom(deviceaddress,1);
if (Wire.available()) rdata = Wire.read();
return rdata;
}
void i2c_eeprom_read_buffer( int deviceaddress, unsigned int eeaddress, byte *buffer, int length )
{
Wire.beginTransmission(deviceaddress);
Wire.write((int)(eeaddress >> 8));
Wire.write((int)(eeaddress & 0xFF));
Wire.endTransmission();
Wire.requestFrom(deviceaddress,length);
for ( int c = 0; c < length; c++ )
if (Wire.available()) buffer = Wire.read();
}