heuristicjohn
Posts: 39
Joined: Thu Jan 31, 2013 11:55 pm

Humble Pie board problem

Sun Jul 06, 2014 5:00 pm

Has anyone else tried to use the Humble Pi interface board to pass on serial data ? I have three of these boards (v1.1), and on each of them the TX line (connector pin 8) is shorted down to 0V via a fault in the copper work. The fault can be corrected by (carefully) scraping away the offending copper, as shown on the photo, which shows pins 21-26 of the RPi connector and the adjacent area.
HPi_sc.JPG
HPi_sc.JPG (57.49 KiB) Viewed 994 times

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panik
Posts: 369
Joined: Fri Sep 23, 2011 12:29 pm
Location: Netherlands

Re: Humble Pie board problem

Sun Jul 06, 2014 6:54 pm

Aha, that explains a lot. Thanks for pointing it out.

There are some semi-randomly placed vias on the board that connect the top to the bottom ground plane. This one touches the TX line. I guess we're still lucky it doesn't go right through it so at least it's still somewhat fixable.

I have 3 v1.1 boards as well (used 1 but gave up on serial, used I2C instead). I wonder if it's fixed in the v1.2 versions.
Microcontroller addon boards and software for Raspberry Pi A+/B+/Pi2:
- ARMinARM: ARM Cortex-M3 (STM32)
- AVRPi: ATmega32U4 & ATmega328 ("Arduino")
http://www.onandoffables.com

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FTrevorGowen
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Re: Humble Pie board problem

Sun Jul 06, 2014 8:39 pm

panik wrote:Aha, that explains a lot. Thanks for pointing it out.
There are some semi-randomly placed vias on the board that connect the top to the bottom ground plane. This one touches the TX line. I guess we're still lucky it doesn't go right through it so at least it's still somewhat fixable.
I have 3 v1.1 boards as well (used 1 but gave up on serial, used I2C instead). I wonder if it's fixed in the v1.2 versions.
I can't say if there is/was still an issue with v1.2 boards, since, by the time I was doing "serial things" I was/am using v1.3 boards which are O.K. as can be seen here:
http://www.cpmspectrepi.webspace.virgin ... erial.html
http://www.cpmspectrepi.webspace.virgin ... erial.html
Trev.
Still running Raspbian Jessie on some older Pi's (an A, B1, B2, B+, P2B, 3xP0, P0W) but Stretch on my 2xP3A+, P3B+, P3B, B+, A+ and a B2. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

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panik
Posts: 369
Joined: Fri Sep 23, 2011 12:29 pm
Location: Netherlands

Re: Humble Pie board problem

Sun Jul 06, 2014 8:51 pm

I wasn't aware of the v1.3 boards. Good to see it's fixed now.
Microcontroller addon boards and software for Raspberry Pi A+/B+/Pi2:
- ARMinARM: ARM Cortex-M3 (STM32)
- AVRPi: ATmega32U4 & ATmega328 ("Arduino")
http://www.onandoffables.com

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