B4R Library rAdafruitBMP280 - BMP280 temperature & pressure sensor

This is a wrapper for Adafruit BMP280 library: https://github.com/adafruit/Adafruit_BMP280_Library

Usage example:

Sub Process_Globals
   Public Serial1 As Serial
   Private bmp As Adafruit_BMP280
End Sub

Private Sub AppStart
   Serial1.Initialize(115200)
   Log("AppStart")
   If bmp.Initialize Then
     Log("Successful")
     Log(bmp.ReadAltitude(1013.25))
     Log(bmp.ReadPressure)
     Log(bmp.ReadTemperature)
   Else
     Log("sensor not found!")
   End If
End Sub

 

[positrom2]

Thank you very very much. That was fast. Can't follow the posts here with that speed.

 

[rbghongade]

Thank you Erel for this library, but the device does not get initialized, I am using the above mentioned code and library!

 

[Erel]

Please test the Arduino IDE example: https://github.com/adafruit/Adafruit_BMP280_Library/blob/master/examples/bmp280test/bmp280test.ino

Does it work for you?

 

[rbghongade]

Dear Erel,
My Wemos resets with the sketch in the above link!

 

[positrom2]

On esp8266-01 it worked.
Resets sometimes are caused by insufficient Power.

 

[positrom2]

For BMP280 on esp8266-01 change in Adafruit_BMP280.cpp:
Wire.begin() to
Wire.begin(2,0); // GPIO2, GPIOO
and connect SCK to GPIO0, SDI to GPIO02.

 

[rbghongade]

Dear friends,
The above solution does not work!

 

[positrom2]

Sub Process_Globals
   Public Serial1 As Serial
   Private bmp As Adafruit_BMP280
End Sub

Private Sub AppStart
   Serial1.Initialize(115200)
   Log("AppStart")
   If bmp.Initialize Then
       Do While 2=2  '<---------------------  Erel likes that ;)
     Log("Successful")
     Log(bmp.ReadAltitude(1013.25))
     Log(bmp.ReadPressure)
     Log(bmp.ReadTemperature)
     Delay(10000)
     Loop
   Else
     Log("sensor not found!")
   End If
End Sub

Successful
-95.0747
102472.1719
20.7300

 

[Erel]

'<--------------------- Erel likes that

Use a timer

 

[derez]

I need help to connect this BMP to Arduino UNO.
I tried both ways - connecting SDL and SDA only, connecting 4 pins : 10 to CSB, 11 to SDA , 12 to SD0, 13 to SCL
It does not work, also with Arduino's sketch.
What am I doing wrong ? or the board is faulty...

 

[Erel]

Maybe this will help: http://arduino.stackexchange.com/questions/23482/bmp280-returns-0

 

[derez]

Maybe this will help: http://arduino.stackexchange.com/questions/23482/bmp280-returns-0

Tried it already

 

[positrom2]

It does not work

Details?
Certainly you have run the I2C scanner....
and have looked for this:
https://learn.adafruit.com/adafruit...s-temperature-sensor-breakout/wiring-and-test

 

[derez]

I have found something more interesting to play with so it will wait for a while.
I have checked both cases in the link but maybe I should try it again.
Thank you !

 

[rwblinn]

Have taken the library as in post #1 as wanted make some changes.
Befor doing so, tested if can build the lib from post #1 as-is using the tool b4rh2xml.
BUT receiving error:

c:\Daten\b4\b4r\libraries\rAdafruitBMP280>java -jar c:\Daten\b4\b4r\tools\B4Rh2xml\B4Rh2xml.jar Adafruit_BMP280.h ../Adafruit_BMP280.xml
Error parsing: Adafruit_BMP280();
parser._parsemethod (java line: 527)
java.lang.NumberFormatException: For input string: "error"
        at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
        at sun.misc.FloatingDecimal.parseDouble(Unknown Source)
        at java.lang.Double.parseDouble(Unknown Source)
        at b4j.example.parser._parsemethod(parser.java:527)
        at b4j.example.parser._parseline(parser.java:464)
        at b4j.example.parser._parseh(parser.java:422)
        at b4j.example.parser._parse(parser.java:267)
        at b4j.example.main._appstart(main.java:46)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
        at anywheresoftware.b4a.BA.raiseEvent(BA.java:84)
        at b4j.example.main.main(main.java:29)

 

[Erel]

The first parameter should be rAdafruit_BMP280.h (the wrapper).

 

[rwblinn]

Thanks = How could I overlook that .

The reason why making amendments to this library, is that I received a BMP280 from another manufacturer then Adafruit.
The BMP280 worked, I2C connected, with this (very nice) I2C library.
Looked up the sources from both libraries and ... as expected, the only difference was the device I2C address.
Changed the address in the Adafruit_BMP280 library to the one from the I2C library and ... the device worked.

Attached the updated library rAdafruitBMP280:

//Initializes the sensor with given address (as int). Returns True if successful.
bool Initialize2(Int addr);

and I2C example attached with output:

BMP280 successful initialized
T:20.61, P:1030.80, A:-7
T:20.61, P:1030.81, A:-7
T:20.62, P:1030.84, A:-7

 

[derez]

I received a BMP280 from another manufacturer then Adafruit.

Can you please show a photo/link of your board, maybe this is my problem...

 

[rwblinn]

BMP280 used:

To help, just scribbled an i2cscanner - check if the device address can be found --- you might need to unplug / plugin the device and scan again if not found first time.