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Power Connections at j2.02 and j4.01?

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Power Connections at j2.02 and j4.01?

Posted by Greg Link at September 07. 2008
I'm working on my own PCB using the Make Controller (similar to the appboard), and in the process of making an Eagle Device (and thus package/symbol) for the MC. In the process, I find that I'm confused by the function two pins serve on the package. In particular, the document http://makingthings.com/resources/schematics/make-controller-pinout.pdf shows J2.02 as an unconnected pin, while J4.01 is shown as an LED connection. Checking http://makingthings.com/resources/schematics/connections.xls however, shows that J2.02 is listed as a V+ connection, and J4.01 a V+ connection as well. Can anyone clarify this discrepancy? Thanks again for all the great work - I do very much enjoy the MC.

Re: Power Connections at j2.02 and j4.01?

Posted by Greg Link at September 07. 2008
Actually, this gets weirder yet. In trying to connect the remainder of the pins on J4, I noticed that the numbering on the two documents seems inconsistent. In particular, the .xls file shows the pins ordered as the following: J4.01 = V+ J4.02 = +3.3V J4.03 = GND J4.04 = GND J4.05 = RX+ while viewing the .pdf shows the following J4.01 = LED2 J4.02 = LED1 ... J4.09 = RX+ J4.10 = GND J4.11 = GND J4.12 = +3.3V J4.13 = N.C. In this case, it seems pin 1 is mislabeled somewhere, and that they're ordered backwards.

Re: Power Connections at j2.02 and j4.01?

Posted by Greg Link at September 17. 2008

A 'bump' on this topic, as these documentation bugs are kindof show stoppers for me. While I can go ahead with my guesses on this one, one generally shouldn't fab PCB's without being certain of the situation. Any help available?

Re: Power Connections at j2.02 and j4.01?

Posted by Liam Staskawicz at September 23. 2008
Hi Greg - thanks for your patience. I just updated this document, I hope I got all the bugs troubling you. In general, the schematics are the final word - I created the pinout because I found it useful when wiring things up, etc. but hadn't used it to design a PCB from. Thanks for spotting those inconsistencies.
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