Bmp085

Thric

Hi all,
I'v been trying to hunt for an object for the bmp085·pressure sensor. Anyone that knows one out there? I would·aslo·like to know whether I need the xclr pin connected or not.

Thanks

Timmoore

Heres the object I use and i dont connect xclr.

Thric

Thanks alot, Thats exactly what I was looking for!

Timmoore

Some comments, it uses my own version of basic_i2c_driver, so I have attached a test program archive with test code and all related objects.

There are 2 calls to get data

GetPressureTemp this waits until it can get the data

GetPressureTempA you keep calling this until it returns true. When it returns false, its triggered the sensor but doesn't have the data, when it returns true it has data. The test code uses this call.

The test code uses GetPressureTempA. The test code tests several other sensors as well but you can ignore that. Also it uses 10Mhz clock with pll8x so dont forget to change that and the i2c bus is not on pins 28/29 so you would need to change that.

shanghai_fool

Many thanks Tim for your object. I had been fighting all night with the calibration data and the many formulas you have to use to get valid data from this device. It sure is a lot more difficult than the SCP1000. Sparkfun has retired that one. I will also look fot more info about your quad on the forum as I am interested in a similar project.
Donald

Gareth

Timmoore wrote: »

Some comments, it uses my own version of basic_i2c_driver, so I have attached a test program archive with test code and all related objects.

There are 2 calls to get data

GetPressureTemp this waits until it can get the data

GetPressureTempA you keep calling this until it returns true. When it returns false, its triggered the sensor but doesn't have the data, when it returns true it has data. The test code uses this call.

The test code uses GetPressureTempA. The test code tests several other sensors as well but you can ignore that. Also it uses 10Mhz clock with pll8x so dont forget to change that and the i2c bus is not on pins 28/29 so you would need to change that.

When i call GetPressureTemp or GetPressureTempA it returns the same values for both - i would expect different values ie one the raw pressure reading and the other the actual corrected pressure (with temperature compensation )
I am assuming it returns the value for both variants in the @TempV, @PressureV am i correct ?
Any help or pointers greatly appreciated.
Thanks Timmoore (for posting the quadtest1) and Thric