hardware_v3: add BOM manufacturer part numbers

[quorten]

Add manufacturer part numbers for all components. All of the selected parts are available on Digi-Key and the field "Digi-Key_PN" was also added for the Digi-Key part numbers, just like the KiCad Digi-Key parts library uses. I opted to pick some of the better parts for the pin headers... higher temperature insulators on the pin headers, gold-plated mating contacts for the large pin headers. Likewise, I picked Panasonic resistors since they end up being the same price as the cheapest except when bought in bulk.

Also I've added a link to the datasheet for the CAT24C32 EEPROM.

Here are the condensed results of generating the BoM:

Reference	Quantity	Digi-Key_PN	MPN	Manufacturer
J1	1	952-2262-ND	M20-9990246	Harwin Inc.
J2	1	S5750-20-ND	NPPN202AFCN-RC	Sullins Connector Solutions
J3	1	23-0877602616-ND	0877602616	Molex
R2	1	P10.0KCCT-ND	ERJ-6ENF1002V	Panasonic Electronic Components
R3 R4	2	P3.90KCCT-ND	ERJ-6ENF3901V	Panasonic Electronic Components
R5	1	P1.40KCCT-ND	ERJ-6ENF1401V	Panasonic Electronic Components
U1	1	CAT24C32WI-GT3CT-ND	CAT24C32WI-GT3	ON Semiconductor
U2	1	296-8467-1-ND	SN74LVC161284DLR	Texas Instruments

N.B.: Digi-Key subtotal today says $6.73.

[garlick]

Fantastic!

Great that the changes are focused - just adding a BOM that people can use to order parts for the v3 board that's currently on OSHPARK makes sense as a first step. Also, it's really really nice from a review point of view, and for clean history when each commit of a PR does one focused thing like this IMHO.

One question: should the component info be in project_components/parport.lib? I'm still trying to wrap my head around what a stable, standalone KiCAD project looks like in github so your thoughts would be appreciated.

Since you took the trouble to make a github markdown table for the BOM would you like to go ahead and add that to the PR as a separate commit that drops it in hardware_v3/BOM.md with a link from the main README.md?

Then this PR can close #32.

Again thanks alot!

[quorten]

Yeah, I think the component info should also go in the local library files like project_components/parport.lib. Ideally, it would have been put in there in an early stage at least for chips and the like, resistors and capacitors may have the part numbers added individually. I think I'll add that in quick.

Definitely, I'll add hardware_v3/BOM.md and also make note of the standoffs and screws there like v2 did.

Speaking of capacitors, the V3 design is missing one as per #28, but I'll add a note about this in the BOM.md while I'm at it.

[quorten]

For the sake of consistency with the v2 Bill of Materials, I've also added the Package, Description, and Notes fields.

[garlick]

This looks perfect @quorten. Ready to merge?

[quorten]

@garlick Sure, I'm ready. Closes issue #30... looks like you've accidentally reference the wrong number earlier.

[quorten]

Oops, not yet, I've noticed I got the table headings mixed up on the BOM part listing the mounting parts. I'll push a quick fix.

[quorten]

There we go, now I'm ready, there was an extra table column in the last table, but only in the header.

[garlick]

Thanks again!