MATTHEWPENA

I finally got some reading from the unit....hurray!  I did have to use base address &h1E and not &h3C.  I'm only running at 10kHz.  Not sure what i did to get it going this time as I had tried the 1E address before.  I hooked up my O-scope for testing today and changed the program (which uses direct I2C commands, and not the multiI2C ones) to just run at 10kHz and read the whoami register in a loop.  It started working and I got return values from the transactions and the 3C value from the whoami register!  go figure?  Next, I set out to read the mag registers...but the auto increment thing didn't seem to work...However, i then tried writting each address before the read...and I started getting real values from all 6 registers that actually change when I move my board! woo hoo!  Now i just have to figure out the proper way to but the bytes together for a full x, y & z values!  i'm not exactly sure how to do that...and I havn't seen any VB code to do it...only C++ or C#, which is only a little helpful.  I'll propably figure it out, but again, any help would be appreciated.  thanks all.

Matthew

Hi Kiwi, Thanks for the reply.  I have tried those addresses, but still no no response.  I've tried looping thru all the speeds from 10khz to 400khz...the board has 4.7 k pull-ups on the lines.  I've done direct commands as well...one write and one read and a combined write/read...still all zero's for return value and return byte!  I just don't have any confirmation that the hardware/firmware/software that I'm using will work.  I have tried the netduino and netduinoplus for hardware references...neither make a difference in getting it to work.  I have 4.2.2.2 firmware and 4.2 netmf drivers for windows 7-64.   I sure wish the I2C doc's spelled out what the commands actually do in code in regards to addresses and set bits.

I have gotten an ultrasonic unit working, xbee units working, a GPS and motor controllers working for my robot...but not this SIMPLE I2C CONNECTION...I Just need to get a real-time heading!  I couldn't locate an analog-output magnetometer...I got an analog accelerometer working, but that dosn't give me a heading!  Any other ideas, hints, tips, tricks would be greatly appreciated...this one's really stumping me and pissing me off a bit too!  I will breakout my old O-scope to check the lines, but if they are working, then what else can the problem be?  I have checked and replaced my jumpers to the board and checked the voltage levels...all OK there.

thanks again everyone.

Matthew