Arduino Barometer with BMP180

1
2#include <Wire.h>
3#include <Adafruit_BMP085.h>
4#include "U8glib.h"
5
6Adafruit_BMP085  bmp;
7
8U8GLIB_PCD8544 u8g(8, 4, 7, 5, 6);  // CLK=8, DIN=4, CE=7, DC=5, RST=6
9
10float  pressure = 0.0;
11float tempC = 0.0;
12float altitude = 0.0;
13void BmpSensorRead(float*  pressure, float* tempC, float* altitude);
14void DisplayPresTemp(float* pressure,  float* tempC, float* altitude);
15
16void setup(void)
17{
18  Serial.begin(9600);
19
20  for (int a = 0; a < 30; a++)
21  {
22    u8g.firstPage();
23
24    do
25    {
26      u8g.setFont(u8g_font_5x8);
27      u8g.setFontRefHeightExtendedText();
28      u8g.setDefaultForegroundColor();
29      u8g.setFontPosTop();
30      u8g.drawStr(4,  a, "BMP180 Sensor");
31    }
32    while (u8g.nextPage());
33  }
34
35  delay(3000);
36
37  if (!bmp.begin())
38  {
39    u8g.firstPage();
40
41    do
42    {
43      u8g.setFont(u8g_font_5x8);
44      u8g.setFontRefHeightExtendedText();
45      u8g.setDefaultForegroundColor();
46      u8g.setFontPosTop();
47      u8g.drawStr(4, 0, "BMP085 Sensor");
48      u8g.drawStr(4,  20, " ERROR!");
49    }
50    while (u8g.nextPage());
51
52    Serial.println("BMP085  sensor, ERROR!");
53
54    while (1) {}
55  }
56}
57void loop(void)
58{
59  BmpSensorRead(&pressure, &tempC, &altitude);
60  DisplayPresTemp(&pressure, &tempC,  &altitude);
61  delay(1000);
62}
63void DisplayPresTemp(float* pressure, float*  tempC, float* altitude)
64{
65  u8g.firstPage();
66
67  do
68  {
69    u8g.setFont(u8g_font_6x10);
70    u8g.setFontRefHeightExtendedText();
71    u8g.setDefaultForegroundColor();
72    u8g.setFontPosTop();
73    u8g.drawStr(2, 0, "Pressure");
74    u8g.setPrintPos(20,  9);
75    u8g.print(*pressure);
76    u8g.drawStr(0, 20, "Temp C");
77    u8g.setPrintPos(45,  20);
78    u8g.print(*tempC);
79    u8g.drawStr(0, 31, "Altitude");
80    u8g.setPrintPos(  45, 40);
81    u8g.print(*altitude);
82  }
83  while (u8g.nextPage());
84}
85void  BmpSensorRead(float* pressure, float* tempC, float* altitude)
86{
87  *tempC =  bmp.readTemperature();
88  Serial.print("Temperature = ");
89  Serial.print(*tempC);
90  Serial.println(" *C");
91
92  *pressure = bmp.readPressure() / 98.5;
93  Serial.print("Pressure  = ");
94  Serial.print(*pressure / 100.0);
95  Serial.println(" hPa");
96
97  // Calculate altitude assuming 'standard' barometric
98  // pressure of 1013.25  millibar = 101325 Pascal
99  *altitude = bmp.readAltitude();
100  Serial.print("Altitude  = ");
101  Serial.print(*altitude);
102  Serial.println(" meters");
103}
104