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Breakout board for the Bosch BMP180 barometric pressure sensor

License: Other

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sparkfun-products barometric-pressure pressure-sensor hardware pressure-sensing

bmp180_breakout's Introduction

NOTE: This product has been retired from our catalog. If you are looking for more up-to-date info, please check out some of these resources to see how other users are still hacking and improving on this product.

BMP180_Breakout

Breakout board and example code for the Bosch BMP180 barometric pressure sensor.

Product page: www.sparkfun.com/products/11824

Datasheet: github.com/sparkfun/BMP180_Breakout/blob/master/BMP180 Datasheet V2.5.pdf

Github repository: github.com/sparkfun/BMP180_Breakout

Arduino library installation:

This archive contains an Arduino library and example sketch showing how to use this sensor. The library must be installed onto your computer in order for the example code to work correctly.

If you haven't, install the free Arduino IDE (Integrated Development Environment), available at www.arduino.cc. This code was written using Arduino version 1.0.5. and updated to be used with the Arduino library manager of version 1.6.3.

To install without the manager, download the Arduino folder then use the Arduino IDE to add it. From the IDE, go Sketch->Include Library->"Add .ZIP Library", then choose the Arduino folder that was downloaded. The IDE will pick proper names from the library.properties file and put the libraries in your user sketch folder.

Teensy library installation:

A. Faruk was kind enough to create a version of this library for the Teensy microcontroller family. You can find information on installation and use of this library at: https://github.com/sparkfun/BMP180_Breakout/tree/master/Libraries/Teensy

Running the example sketch:

Connect the BMP180 breakout board to your Arduino. You can solder wires, use jumper wires and headers, etc.
"-" (GND) to GND
"+" (VDD) to 3.3V
(WARNING: do not connect "+" to 5V or the sensor will be damaged!)
You will also need to connect the I2C pins (SCL and SDA) to your Arduino. These pins are different on different Arduino models:

Any Arduino SDA SCL

Uno, Redboard, Pro/Mini A4 A5

Mega2560, Due 20 21

Leonardo, Pro/Micro 2 3

Leave the IO (VDDIO) pin unconnected. This pin is for connecting the BMP180 to systems with lower logic levels such as 1.8V.
Connect your Arduino to your computer.
Start the Arduino IDE. Select the proper COM port and board type.
In the Arduino IDE, go to the File menu, and down to Examples/SFE_BMP180/SFE_BMP180_example. If you do not see this item, you likely did not install the library properly. See above.
Upload the sketch to your Arduino.
Open the Serial Monitor window (magnifying glass icon un upper right of IDE).
Set the Serial Monitor to 9600 baud (menu in bottom right).

You should now be seeing pressure measurements in the Serial Monitor window. If you see errors, you may not have connected the BMP180 Breakout Board to your Arduino properly. See step 1 above.

If you have questions, don't hesistate to contact us at [email protected].

Have fun! Your friends at SparkFun.

License Informatiom

Software and hardware license information can be found at: https://github.com/sparkfun/BMP180_Breakout/blob/master/LICENSE.md

Authors

Mike Grusin, SparkFun Electronics

Acknowledgements

The SFE_BMP180 library uses floating-point equations for the BMP085 developed by the Weather Station Data Logger project.
Thank you to A. Faruk for modifications to support the PJRC Teensy microcontroller family.
Thank you to Asafe Silva for providing support for alternate I2C implementations.

Changelog

Release V_1.1.0
- Restructred for arduino IDE
- Pulled in library
hardware V10 (release)
- Minor updates
- Library fork from SFE_BMP085
hardware V02 (proto)
- Rearranged header: put VDD/GND/SDA/SCL in "standard" order
- I2C pullups to VDDIO
hardware V01 (review)

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bmp180_breakout's Issues

Minimal change in pressure & no change in altitude

I've tried this drive but I get some problem with calculated value as described in the object.
I'm trying to understand if there are some casting problem.

Best regards
Alessandro

No need to wait for data after Wire.requestFrom()

See : sparkfun/BMP180_Breakout_Arduino_Library#3

Json line that goes in preferences

I did not see that anywhere . Is the only way to download the library via the zip file?

Possible error in ReadInt

The code is:

char SFE_BMP180::readInt(char address, int &value)
// Read a signed integer (two bytes) from device
// address: register to start reading (plus subsequent register)
// value: external variable to store data (function modifies value)
{
unsigned char data[2];

    data[0] = address;
    if (readBytes(data,2))
    {
            value = (((int)data[0]<<8)|(int)data[1]);
            //if (*value & 0x8000) *value |= 0xFFFF0000; // sign extend if negative
            return(1);
    }
    value = 0;
    return(0);

}

I believe the line writing value should be

value = (int) ((data[0] << 8) | (data[1]));

Certainly the cast ((int) data[1]) is wrong -- if the msb of data[1] is 1, then this cast will sign extend which you don't want.

Not loading library

I think you should include a note for anyone downloading the zip file that you must go to the Library/Arduino directory and only copy the 6 files there (examples etc )to leave under SFE_BMP180 otherwise its a ballsup with all the other stuff you have in there!

Can you send the data from 1 BMP180 sensor to 2 different Arduino Unos?

Can you send the data from 1 BMP180 sensor to 2 different Arduino Unos? This is so I can simulate the data in 2 different ways using 2 different serial ports. There would only by 1 3.3V power supply and the grounds would all be connected together properly, but the SDA and SCL pins would be connected to both Arduino Unos on the same pins (A4 & A5). I'm not sure if it's possible, but I thought I would ask. Thank you!

Having both .startTemperature and .startPressure open at the same time

Hi,
I found a little annoyance in this library, when you have both startTemperature and startPressure active, the getTemperature and the get getPressure method output weird values.
Maybe usefull to not in the documentation that this isn't possible.
Regards

how to add 2 bmp180 sensors to one arduino board?

Hi,

I need to add 2 BMP180 pressure sensor to one arduino board.
sensors will place in different pressure conditions.
Would you please tell me which changes should be done in the program to read data from both simultaneously?
in case of hardware, to which pins the second one should be connected?
I connected 1 sensor and read the measurement.

Any Arduino	SDA	SCL
Uno, Redboard, Pro/Mini	A4	A5
Mega2560, Due	20	21
Leonardo, Pro/Micro	2	3