ssatterthwaite

Thanks for the response and welcome Chris.  You've been super helpful on this forum.

Unfortunately I think there is something more serious going on.  I cannot get the N+2 to show up as a USB device of any sort.  This is of course pressing the button during power on.  I have rebooted a few times; tried 3 different USB cables; all with no success.  I tried a second computer with an older Windows OS, also to no avail.  There is nothing connected to the N+2 other than the USB cable.

I do have access to a JTAG programmer at work.  Would it be worth it to solder in the mini JTAG?  Is there anything more I can do to debug with a scope or logic analyzer?  I had noticed that the +5V and +3V are not present at the header.  It looks like they are latched in the schematic (I assume enabled after a boot sequence).  I do see happy 5 volts at the regulator next to the micro SD slot.

Scott

I just encountered this same problem.  I have a two week old or so N+2 and it worked great until this morning.  It now won't show up as a USB device even if I hold the button on power up.  The blue light is always on when I apply power.

I've tried 3 different USB cables with no better results.  Is there any recourse: boot from sd card, hard reset, etc?

I'm fairly careful with static precautions, and I've got it mounted on a lexan board with standoffs.  The last thing I was working on was connecting to a 20x4 LCD display.  Maybe I pulled too much from the 5V on the N+2 for the backlight?

Any help would be appreciated.

BTW, I've found your forums to be very helpful, and everything has been working well up until now.  I'm using mine for the basis of a beer brewing control project.  I'm using PT100 RTDs for temperature logging and am planning on running a PID controller for control.

thanks

Scott