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Itsy Bitsy M0 no BAT/USB/Vhi
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Please be positive and constructive with your questions and comments.

Itsy Bitsy M0 no BAT/USB/Vhi

by finh on Sun Sep 09, 2018 9:55 am

Hi! I recently soldered up an Itsy Bitsy M0. When it's plugged in to USB, it appears as a disk and the lights light up.

When I use my multimeter on the 3V pin I see 3.2V as I'd expect.

When I switch the multimeter to test any of the BAT, USB, or Vhi pins, I get zero volts.

Did I fry something accidentally? Is there any recovery from this?

The solder joints all look ok. I don't see any pins being bridged or anything.

Thanks in advance for any help.

finh
 
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Re: Itsy Bitsy M0 no BAT/USB/Vhi

by adafruit_support_mike on Mon Sep 10, 2018 12:31 am

Post a photo showing your hardware and the connections you're using to measure, say, the voltage on the BAT pin please. 800x600 images usually work best.

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Re: Itsy Bitsy M0 no BAT/USB/Vhi

by finh on Tue Sep 11, 2018 8:30 pm

I have photos of 3V working and Vhi and USB at 0 volts. I'm powering it over USB so I guess I wouldn't expect anything on BAT.

I tried another Itsy-Bitsy (not pictured) and Vhi and USB were 5v with the same setup.

Thanks for your time!
Attachments
IMG_2918.jpg
USB not working
IMG_2918.jpg (108.6 KiB) Viewed 30 times
IMG_2917.jpg
Vhi not working
IMG_2917.jpg (114.12 KiB) Viewed 30 times
IMG_2916.jpg
3v working
IMG_2916.jpg (113.57 KiB) Viewed 30 times

finh
 
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Re: Itsy Bitsy M0 no BAT/USB/Vhi

by BryonMiller on Wed Sep 12, 2018 12:31 pm

Your voltmeter is not saying 0 V (which I believe would show up as 0.000), instead it is saying OF (that's a capital O, capital F). OF stand for OverFlow and it means that the input signal has exceeded the maximum input as determined by your Range. It appears your Range is set to 4 volts, which is fine for the 3.3 v reading but not so good for voltages closer to 5 volts.

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Re: Itsy Bitsy M0 no BAT/USB/Vhi

by finh on Wed Sep 12, 2018 5:15 pm

Ah, thank you.

That is true, and I tried again with it in set to "auto" range and it now reads as 5v. For some reason I had given myself the impression that the range control worked in powers of 10, rather than a cutoff at 4v.

I think my original problem (NeoPixels not appearing to get power when plugged in to Vhi) may have been due to some flaky jumper cables. I then confused myself into thinking it was the microcontroller because I wasn't using the multimeter correctly.

Thanks again for your time and response! It looks like my Itsy Bitsy is actually just fine.

finh
 
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Joined: Sun Jun 24, 2018 1:40 pm

Re: Itsy Bitsy M0 no BAT/USB/Vhi

by adafruit_support_mike on Thu Sep 13, 2018 2:06 am

Glad to hear things are working, or at least that you're getting closer to making them work. Happy hacking!

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Please be positive and constructive with your questions and comments.