// ----------------------------------------------------
    //
    // i2c_scanner plus read BMP180 Sensor using Adafruit Libraries
    // Version 1.0
    // Version 1.0 October 10,2107
    // by Microrustyc
    // I2C Scanning addresses from 0...127
    // This sketch tests the standard 7-bit addresses
    // Devices with higher bit address might not be seen properly. 
    // Baud rate 115200 for console Port
    // Reads BMP180 Altitude and Air Pressure and display to Console
    // 
    // -----------------------------------------------------
#include <Wire.h> //  Include Arduino I2C library 
#include <Adafruit_BMP085.h> // Adafruit BMP085 Library Version 1.0.0 or Adafruti BMP085 Unified Version 1.0.0? 
Adafruit_BMP085 bmp; 
int bmp_ERR =0; 

void setup()
{
      Serial.begin(115200);
      Serial.println("Oct 25, 2017 Embedded Workshop.");
      Serial.println("Baud rate 115200 for console Port.");
      Serial.println("Reads BMP180 Altitude and Air Pressure and display to Console");
      Serial.println ();                //Line Feed
      Wire.begin();                     // Start I2C 
      Serial.println("\nI2C Scanner");  // Print to console
}
void loop() {
  Scanner();                  // Check for I2C devices connected 
  Test_bmp();                 // Check for the BMP Sensor
  Read_BMP180();              // Read the sensor

} 
void Scanner()
{
    byte error, address;
    int nDevices;
    Serial.println("Scanning...");      // Print to console
    nDevices = 0;                       //number of devices
    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
  return;
}
void Test_bmp() {
  
  if (!bmp.begin()) {
    Serial.println("Could not find BMP180 or BMP085 sensor at 0x77"); // Display Error Message to Console
    Serial.println();
    delay(5000);        // wait 5 seconds for next scan and wait for scan to clear
    bmp_ERR = 1;
    return;
  }
    return;          
}
void Read_BMP180()
{
  if (!bmp.begin()) {
    Serial.println("Could not find BMP180 or BMP085 sensor at 0x77"); // Display Error Message to Console
    Serial.println();
    delay(8000);
    bmp_ERR = 1;
    return;
  }
  float inch;
  float mbar;
  float Alt;
  float Temp1;
  float Press;
  // Display to Console Port
  Serial.println("BMP Sensor Connected and Working ");
  Serial.println();
  Serial.print("Temperature = ");
  Serial.print(bmp.readTemperature());
  Serial.println(" °C");
  Serial.print("Pressure = ");
  Serial.print(bmp.readPressure());
  Serial.println(" Pa");
  // Calculate altitude assuming 'standard' barometric
  // pressure of 1013.25 millibar = 101325 Pascal
  Serial.print("Altitude = ");
  Serial.print(bmp.readAltitude());
  Serial.println(" meters");
  Serial.print("Altitude = ");
  Alt = bmp.readAltitude();
  Alt = Alt * 3.2808;
  Serial.print(Alt);
  Serial.println(" Feet");
  Serial.print("Pressure at sea level (calculated) = ");
  Serial.print(bmp.readSealevelPressure());  
  Serial.println(" Pa");
  // you can get a more precise measurement of altitude
  // if you know the current sea level pressure which will
  // vary with weather and such. If it is 1015 millibars
  // that is equal to 101500 Pascals.
  Serial.print("Real altitude = ");
  Serial.print(bmp.readAltitude(101500));
  Serial.println(" meters");
  Serial.println();
  delay(5000);                // wait 5 seconds for next scan and wait for scan to clear
  return;
}