sgraves, you totally did it!  Thanks so much for posting this workaround.

It's totally weird that you have to pull something like this to get it to work right, but... after this many hours of trying stuff, I'll take it!

Thanks, again!

Hahaha.  You mean an open source platform has other bugs, too??

I do have a Netduino Mini sitting on my shelf that I was going to tackle once I got my feet wet with this, but... Maybe I need to hook up this barometer to the mini to isolate the problem being with the Netduino 2.  At least then I would know.

NooM, do you have or have you ever used a Netduino 2 or +2 with i2c?  I may end up getting another one, but I don't want to go through this again.  I mean, it does work, right?

So, I put everything back the way it was, only updated the firmware to 4.2.2.2.  It actually behaves the same say.  All values report 0 until I disconnect and then reconnect the SDA pin while it's running.

So my last question still stands, I suppose.  Has anyone ever run into this problem?  Any thoughts on what might cause this?

I'm at a total loss, and almost ready to scrap this Netduino.  

Thanks in advance.

Hahahahahaha.  WTF did I just do??  

Okay.  This sounds worse than it is.  I will try out 4.2.2.2 on my original development machine and report back.

Thanks!

Okay, I have updated to Windows 7, NETMF 4.3, Visual Studio 2012 and the Netduino Firmware 4.3 Beta.  It didn't make a difference by itself, but then I stumbled upon something that makes no sense.  I'm hoping someone can explain this to me.

Using the code that NooM was nice enough to provide, Visual Studio spit out this in the output window upon the Netduino booting up:

Man, I do not have Windows 7 installed, but I am totally following what you're saying.

Looks like I have some work to do before I can proceed.

You've pointed me in the right direction, NooM!  Thank you!

Okay.  I am going to assume your code is good.  Still returning 0's for all values.

I did not include pull-ups, because I read this one the adafruit product site:

"The sensor is soldered onto a PCB with a 3.3V regulator, I2C level shifter and pull-up resistors on the I2C pins. "

Are you saying I still need to add them anyway?

I will try this regardless, but...  you think it may be a misprint?  That is, did you add them yourself?

Thanks, Noom!  

I am starting to wonder if anyone has ever gotten the Netduino 2 and the BMP085 to work over i2c.  Seems to be a weird combination out there on the web.  Hmm.

Hi hongnhattl, 

You would probably want to look into using the System.Reflection namespace to load your assemblies dynamically.  I have done this with Windows apps and web sites, but not with the NETMF.  I did, however, find an article from someone that has.  Looks promising.

Hope this helps.

http://fabienroyer.w...ith-a-netduino/

Danger

Yes, I'm a noob.  Man, I'm glad I got that off my chest.  

This is the first time I've attempted to hook up a sensor using I2C and I decided to start with this barometer from Adafruit.com: http://www.adafruit.com/products/391

Anyway (11 hours later), what I thought would be simple turned out to be not so simple.  Here is what I am facing.

I have:

- A Netduino 2 running Firmware 4.2.2.1

- A Barometric Pressure sensor from Adafruit (BMP085)  http://www.adafruit.com/products/391  (datasheet: http://www.adafruit....85-DS000-06.pdf)

- A headache

- And the following code:

            byte[] Addr = new byte[2];            Addr[0] = 0xF4;            Addr[1] = 0x34;            byte[] TxBuff = new byte[4];            byte[] RxBuff = new byte[4];            I2CDevice.Configuration I2C_Configuration = new I2CDevice.Configuration(0x77, 400);            I2CDevice I2C1 = new I2CDevice(I2C_Configuration);            I2CDevice.I2CTransaction[] WriteTran = new I2CDevice.I2CTransaction[]             {                I2CDevice.CreateWriteTransaction(Addr),                I2CDevice.CreateWriteTransaction(TxBuff)            };            I2CDevice.I2CTransaction[] ReadTran = new I2CDevice.I2CTransaction[]            {                I2CDevice.CreateWriteTransaction(Addr),                I2CDevice.CreateReadTransaction(RxBuff)            };            while (true)            {                                int iWriteCount = I2C1.Execute(WriteTran, 1000);                Debug.Print("Write Count: " + iWriteCount.ToString());                Thread.Sleep(200);                int iReadCount = I2C1.Execute(ReadTran, 1000);                Debug.Print("Read Count: " + iReadCount.ToString());                string ReadOut = new string(System.Text.Encoding.UTF8.GetChars(RxBuff));                Debug.Print("EEPROM CONTENT:" + ReadOut);                                Thread.Sleep(200);            }