BMP180加oled显示
感谢do335maomao的教程。做了一个oled显示
#include <SFE_BMP180.h>
#include <Wire.h>
#include "U8glib.h"
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_DEV_0|U8G_I2C_OPT_NO_ACK|U8G_I2C_OPT_FAST); // Fast I2C / TWI
SFE_BMP180 pressure;// 创建一个气压计对象
double baseline; // 基准气压
double pp,tt,hh;
void setup()
{
Serial.begin(9600);
Serial.println("REBOOT");
// 初始化传感器
if (pressure.begin())
Serial.println("BMP180 init success");
else
{
// 糟糕，气压计出问题了，多半是连线有问题
Serial.println("BMP180 init fail (disconnected?)\n\n");
while(1); // 暂停
}
//获得基准气压
baseline = getP();
Serial.print("baseline pressure: ");
Serial.print(baseline);
Serial.println(" hPa");
}
void loop()
{
double a,p,t;
p = getP();// 获得一个气压值
a = pressure.altitude(p,baseline);//获得基于基准气压的高度值
pp=p;
hh=a;
Serial.print("relative altitude: ");
if (a >= 0.0) Serial.print(" "); // 调整正数显示格式
Serial.print(a,1);
Serial.print(" meters ");
t = getT();// 获得一个温度值
Serial.print("temperature: ");
Serial.print(t,1);
Serial.println(" degrees");
tt=t;
delay(500);//刷新率
//======开始显示==========
u8g.firstPage();
do {
draw();
} while( u8g.nextPage() );
}
double getP()
{
char status;
double T,P,p0,a;
// You must first get a temperature measurement to perform a pressure reading.
// Start a temperature measurement:
// If request is successful, the number of ms to wait is returned.
// If request is unsuccessful, 0 is returned.
status = pressure.startTemperature();
if (status != 0)
{
// Wait for the measurement to complete:
delay(status);
// Retrieve the completed temperature measurement:
// Note that the measurement is stored in the variable T.
// Use '&T' to provide the address of T to the function.
// Function returns 1 if successful, 0 if failure.
status = pressure.getTemperature(T);
if (status != 0)
{
// Start a pressure measurement:
// The parameter is the oversampling setting, from 0 to 3 (highest res, longest wait).
// If request is successful, the number of ms to wait is returned.
// If request is unsuccessful, 0 is returned.
status = pressure.startPressure(3);
if (status != 0)
{
// Wait for the measurement to complete:
delay(status);
// Retrieve the completed pressure measurement:
// Note that the measurement is stored in the variable P.
// Use '&P' to provide the address of P.
// Note also that the function requires the previous temperature measurement (T).
// (If temperature is stable, you can do one temperature measurement for a number of pressure measurements.)
// Function returns 1 if successful, 0 if failure.
status = pressure.getPressure(P,T);
if (status != 0)
{
return P;
}
else Serial.println("error retrieving pressure measurement\n");
}
else Serial.println("error starting pressure measurement\n");
}
else Serial.println("error retrieving temperature measurement\n");
}
else Serial.println("error starting temperature measurement\n");
}
double getT()
{
char status;
double T,p0;
status = pressure.startTemperature();
if (status != 0)
{
delay(status);
status = pressure.getTemperature(T);
if (status != 0)
{
status = pressure.startPressure(3);
return T;
}
else Serial.println("error retrieving temperature measurement\n");
}
else Serial.println("error starting temperature measurement\n");
}
void draw(void) {
u8g.setPrintPos(0, 20); //定义显示位置 横向起始位置0 纵向45
u8g.print("T");
u8g.print(":");
u8g.print(tt);
u8g.print(" C");
u8g.setPrintPos(0, 40);
u8g.print("P");
u8g.print(":");
u8g.print(pp);
u8g.print(" HPA");
u8g.setPrintPos(0, 60);
u8g.print("H"); //显示分钟的值
u8g.print(":"); //显示一个冒号
u8g.print(hh);
u8g.print(" M");
u8g.setFont(u8g_font_freedoomr10r);//调整显示字体
}
附加do335maomao的原文
http://www.geek-workshop.com/forum.php?mod=viewthread&tid=12657&highlight=bmp180
温度不是很准啊 在验证时出现以下的错误，搞不懂。
请指点，谢谢！
sketch_sep30b.ino:4:27: error: 'U8G_I2C_OPT_DEV_0' was not declared in this scope
sketch_sep30b.ino:4:45: error: 'U8G_I2C_OPT_NO_ACK' was not declared in this scope
sketch_sep30b.ino:4:64: error: 'U8G_I2C_OPT_FAST' was not declared in this scope
编译有误。 元器件是什么 ？接线图如何？尽可能讲详细点，谢谢！！ 最帅的老饼 发表于 2017-9-30 16:44
元器件是什么 ？接线图如何？尽可能讲详细点，谢谢！！
楼主已经写了BMP180
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