Grove - Barometer Sensor (BMP180)

This is a Grove module for the Bosch BMP180 high-precision, low-power digital barometer. The BMP180 offers a pressure measuring range of 300 to 1100 hPa with an accuracy down to 0.02 hPa in advanced resolution mode. It’s based on piezo-resistive technology for high accuracy, ruggedness and long term stability. The chip only accepts 1.8V to 3.6V input voltage. However, with outer circuit added, this module becomes compatible with 3.3V and 5V. Therefore, it can be used on Arduino/Seeeduino or Seeeduino Stalker without modification. It is designed to be connected directly to a micro-controller via the I2C bus.

Features

• Digital two wire (I2C) interface
• Wide barometric pressure range
• Flexible supply voltage range
• Ultra-low power consumption
• Low noise measurement
• Factory-calibrated
• -40 to +85°C operational range, ±2°C temperature accuracy
• I2C address: 0x77

note

If you want to use multiplue I2C devices, please refer to [Software I2C](https://wiki.seeedstudio.com/Arduino_Software_I2C_user_guide/).

tip

More details about Grove modules please refer to [Grove System](https://wiki.seeedstudio.com/Grove_System/)

Application Ideas

• Enhancement of GPS navigation
• Indoor and outdoor navigation
• Leisure and sports
• Weather forecast
• Vertical velocity indication (rise/sink speed)

Specifications

Item	Min	Typical	Max	Unit
Voltage	3	5	5.5	VDC
Current	1.1	/	20	uA
Pressure Range	300	/	1100	hPa
Faster I2C data transfer	/	/	3.4	MHZ
Dimension	40.1*20.2*9.7			mm

Platforms Supported

Arduino	Raspberry Pi

caution

The platforms mentioned above as supported is/are an indication of the module's software or theoritical compatibility. We only provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library / demo code for all possible MCU platforms. Hence, users have to write their own software library.

Getting started

Play with Arduino

Hardware

• Step 1. Prepare the below stuffs:

Seeeduino V4.2	Base Shield	Grove-Barometer_Sensor-BMP180
Get One Now	Get One Now	Get One Now

• Step 2. Connect Grove-Barometer_Sensor-BMP180 to port I2C of Grove-Base Shield.
• Step 3. Plug Grove - Base Shield into Seeeduino.
• Step 4. Connect Seeeduino to PC via a USB cable.

note

    If we don't have Grove Base Shield, We also can directly connect this module to Seeeduino as below.

Seeeduino_v4	Grove-Barometer_Sensor-BMP180
5V	VCC
GND	GND
SDA	SDA
SCL	SCL

Software

Step 1. Download the the library from Github.

Step 2. Refer How to install library to install library for Arduino.

Step 3. Create a new Arduino sketch and paste the codes below to it or open the code directly by the path:File -> Example ->Barometer_Sensor->Barometer_Sensor.

Here is the code

    #include "Barometer.h"
    #include <Wire.h>
    float temperature;
    float pressure;
    float atm;
    float altitude;
    Barometer myBarometer;
    void setup(){
      Serial.begin(9600);
      myBarometer.init();

    }

    void loop()
    {
       temperature = myBarometer.bmp085GetTemperature(myBarometer.bmp085ReadUT()); //Get the temperature, bmp085ReadUT MUST be called first
       pressure = myBarometer.bmp085GetPressure(myBarometer.bmp085ReadUP());//Get the temperature
       altitude = myBarometer.calcAltitude(pressure); //Uncompensated calculation - in Meters
       atm = pressure / 101325;

      Serial.print("Temperature: ");
      Serial.print(temperature, 2); //display 2 decimal places
      Serial.println("deg C");

      Serial.print("Pressure: ");
      Serial.print(pressure, 0); //whole number only.
      Serial.println(" Pa");

      Serial.print("Ralated Atmosphere: ");
      Serial.println(atm, 4); //display 4 decimal places

      Serial.print("Altitude: ");
      Serial.print(altitude, 2); //display 2 decimal places
      Serial.println(" m");

      Serial.println();

      delay(1000); //wait a second and get values again.
    }

Step 4. Open the serial monitor to receive the sensor's data including temperature, barometric pressure value, relative atmosphere pressure and altitude.

Play With Raspberry Pi

Hardware

• Step 1. Prepare the below stuffs:

Raspberry pi	GrovePi_Plus	Grove-Barometer_Sensor-BMP180
Get One Now	Get One Now	Get One Now

• Step 2. Plug the GrovePi_Plus into Raspberry.
• Step 3. Connect Grove-Barometer_Sensor-BMP180 to I2C port of GrovePi_Plus.
• Step 4. Connect the Raspberry to PC through USB cable.

Software

• Step 1. Follow Setting Software to configure the development environment.
• Step 2. Git clone the Github repository.

cd ~
git clone https://github.com/DexterInd/GrovePi.git

• Step 3. Excute below commands to use this sensor

cd ~/GrovePi/Software/Python/grove_barometer_sensors/barometric_sensor_bmp180
python grove_i2c_barometic_sensor_example.py

#!/usr/bin/python
import time
import smbus
import RPi.GPIO as GPIO
#import grovepi
from grove_i2c_barometic_sensor_BMP180 import BMP085

# ===========================================================================
# Example Code
# ===========================================================================

# Initialise the BMP085 and use STANDARD mode (default value)
# bmp = BMP085(0x77, debug=True)
bmp = BMP085(0x77, 1)

# To specify a different operating mode, uncomment one of the following:
# bmp = BMP085(0x77, 0)  # ULTRALOWPOWER Mode
# bmp = BMP085(0x77, 1)  # STANDARD Mode
# bmp = BMP085(0x77, 2)  # HIRES Mode
# bmp = BMP085(0x77, 3)  # ULTRAHIRES Mode

rev = GPIO.RPI_REVISION
if rev == 2 or rev == 3:
  bus = smbus.SMBus(1)
else:
  bus = smbus.SMBus(0)

while True :
  temp = bmp.readTemperature()

# Read the current barometric pressure level
  pressure = bmp.readPressure()

# To calculate altitude based on an estimated mean sea level pressure
# (1013.25 hPa) call the function as follows, but this won't be very accurate
# altitude = bmp.readAltitude()

# To specify a more accurate altitude, enter the correct mean sea level
# pressure level.  For example, if the current pressure level is 1023.50 hPa
# enter 102350 since we include two decimal places in the integer value
  altitude = bmp.readAltitude(101560)

  print("Temperature: %.2f C" % temp)
  print("Pressure:    %.2f hPa" % (pressure / 100.0))
  print("Altitude:    %.2f m" % altitude)
  time.sleep(.1)

• Step 4. Here is the result:

  

Schematic Online Viewer

Resources

• [Eagle] Grove - Barometer Sensor(BMP180) Eagle File
• [Library] Barometer_Sensor Library
• [Datasheet] BMP180 datasheet
• [Altitude Vs. Pressure] The following is a reference graph plotting out the relationship between altitude above sea level and barometric pressure.

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Tech Support & Product Discussion

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