Barometric Pressure & Temperature Sensor Module BMP180

This precision sensor from Bosch is the best low-cost sensing solution for measuring barometric pressure and temperature. Because pressure changes with altitude you can also use it as an altimeter! The sensor is soldered onto a PCB with a 3.3V regulator, I2C level shifter and pull-up resistors on the I2C pins. The BMP180 is the next-generation of sensors from Bosch, and replaces the BMP085.
The good news is that it is completely identical to the BMP085 in terms of firmware/software/interfacing – you can use any example code/libraries for BMP085 as a drop-in replacement.

Applications

• Optimized for use in mobile phones, PDAs, GPS navigation devices and outdoor equipment.

Features

• High precision digital pressure sensors for consumer applications.
• Ultra-low power
• Low-voltage
• I2C interface

Specifications

• Pressure sensing range: 300-1100 hPa (9000m to -500m above sea level)
• Up to 0.03hPa / 0.25m resolution
• -40 to 85?C operational range, -2?C temperature accuracy

Document

• BMP180 Datasheet

Connect GY-68 to Arduino

Arduino Sketch:

#include <Wire.h>
#include <Adafruit_BMP085.h>
// Connect VCC of the BMP180 sensor to 3.3V
// Connect GND to Ground
// Connect SCL to i2c clock  thats A5
// Connect SDA to i2c data  thats A4
Adafruit_BMP085 bmp;
void setup()
{
  Serial.begin(9600);
  if (!bmp.begin())
  {
	Serial.println("BMP180 sensor not found");
	while (1) {}
  }
}
void loop() {
    Serial.print("Temperature = ");
    Serial.print(bmp.readTemperature());
    Serial.println(" *C");
    Serial.print("Altitude = ");
    Serial.print(bmp.readAltitude(101500));
    Serial.println(" meters");
    Serial.println();
    delay(1000);
}

Output
This was the reading from the serial monitor
Temperature = 22.90 *C
Altitude = 103.32 meters