Connect Vin to the power supply, 3V or 5V is fine. Use the same
voltage that the microcontroller logic is based off of. For most
Arduinos, that is 5V
- Connect GND to common power/data ground
- Connect the SCK pin to Digital #13 but any pin can be used later
- Connect the SDO pin to Digital #12 but any pin can be used later
- Connect the SDI pin to Digital #11 but any pin can be used later
- Connect the CS pin Digital #10 but any pin can be used later
To begin reading sensor data, you will need to download the Adafruit BMP183 library from the Arduino library manager.
Open up the Arduino library manager:
Search for the Adafruit BMP183 library and install it
We also have a great tutorial on Arduino library installation at:
Open up File->Examples->Adafruit_BMP183->BMP183test and upload to your Arduino wired up to the sensor
Temperature is calculated in degrees C, you can convert this to F by using the classic F = C * 9/5 + 32 equation.
Pressure is returned in the SI units of Pascals. 100 Pascals = 1 hPa = 1 millibar. Often times barometric pressure is reported in millibar or inches-mercury. For future reference 1 pascal =0.000295333727 inches of mercury, or 1 inch Hg = 3386.39 Pascal. So if you take the pascal value of say 100734 and divide by 3389.39 you'll get 29.72 inches-Hg.
You can also calculate Altitude. However, you can only really do a good accurate job of calculating altitude if you know the hPa pressure at sea level for your location and day! The sensor is quite precise but if you do not have the data updated for the current day then it can be difficult to get more accurate than 10 meters.
Adafruit_BMP183 bmp = Adafruit_BMP183(BMP183_CLK, BMP183_SDO, BMP183_SDI, BMP183_CS);
In this case, you can use any CS pin, but the other three pins are fixed
Pass in the current sea level pressure in hPa - so the value will be somewhere around ~1000. You can also test with the generic 1013.25 value.