1. BMP085 Barometric Digital Pressure Sensor Module
TYWu

2.  Module
Picture

3.  Features
Pressure range: hPa (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
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 pressure 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

14. NEW Module: BMP180

15. References
中文網頁

16. References