1. BMP085 Barometric Digital Pressure Sensor Module TYWu

2. Module Picture

3. Features Pressure range: 300 - 1100hPa (9000 meters above sea level to -500 m). Power supply voltage: 3V-5V. Low power consumption: 5μA in standard mode. Precision: low-power mode, the resolution of 0.06hPa (0.5 m). hPa 百帕 1 百帕 =1 毫巴

4. Features High linear mode with a resolution of 0.03hPa (0.25 m). Means of communication: IIC communication protocol. With temperature output. Response time: 7.5ms. Temperature compensation.

5. Schematic

6. Atmospheric Pressure vs. Altitude Diagram

7. Atmospheric Pressure vs. Altitude At low altitudes above the sea level, the pressure decreases by about 1.2 kPa for every 100 meters. Sea level standard atmospheric pressure101325 Pa

8. Arduino Connect this module with Arduino –Arduino GND -> BMP085 GND –Arduino 3.3V -> BMP085 VCC –Arduino A4 (SDA) -> BMP085 SDA –Arduino A5 (SCL) -> BMP085 SCL

9. Arduino Connection

10. Arduino Code : void setup() { Serial.begin(9600); Wire.begin(); bmp085Calibration(); }

11. Arduino void loop() { temperature = bmp085GetTemperature(bmp085ReadUT()); pressure = bmp085GetPressure(bmp085ReadUP()); Serial.print("Temperature: "); Serial.print(temperature, DEC); Serial.println(" *0.1 deg C"); Serial.print("Pressure: "); Serial.print(pressure, DEC); Serial.println(" Pa"); Serial.println(); delay(1000); }

12. Arduino Result

13. References https://docs.google.com/file/d/0B2_rhD NAxM4samxIU3BscEQ4bzg/edit?pli=1