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Thanks Andrew. The calibration is stored in the EEPROM so thanks for confirming this is not erased.

As for the main problem - I, er, um, er, hadn't connected the DTR pin at all

Now it's plugged in it works so much better. Sorry.

Hi Andrew. Reset doesn't clear the chip - it just restarts the program so I'm fine with the reset workaround. Unless you think differently.

Hi Andrew Thanks for getting back. Both Pro Minis and the FTDI adapters are from you. As you saw i bought 2 adapters in error in Jan this year. Used 1 with great success - so much so I posted on GY-5150 / MPU-9150 9-Axis Accel Gyro & Compass (HCMODU0064) - but coming back to the project this autumn ...

Hi Andrew My pro mini used to work fine but now won't talk to me I've given up on my sketch and tried the standard Blink sketch but it also gives avrdude: stk500_getsync(): not in sync: resp=0x00 with shift pressed it becomes avrdude: error: could not find USB device "USBasp" with vid=0x16c0 pid=0x5...

I found this works really well https://github.com/richards-tech/MPU9150Lib on the right is a Download Zip file. Download it to anywhere (My Downloads or Desktop or anywhere - I doesn't matter!) and Unzip it. This creates a folder called MPU9150Lib-master Open MPU9150Lib-master Double click on MPU915...

The code and the sensor work great giving me all the data I could wish for. I can calculate a bearing in radians using atan2(Comp Y, Comp X) which I convert to degrees and if less than 0 add 360, which is great when the breakout is flat but is too crude for when the breakout is tilted in either dire...