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:Concerning Arduino, examine the Processor column at [[Arduino#Arduino_board_models]], and look at all those links to the exact microcontrollers. • [[User:Sbmeirow|<span style="color:#8D38C9;">Sbmeirow</span>]] • [[User talk:Sbmeirow|<span style="color:#8D38C9;White;">Talk</span>]] • 16:58, 2 January 2012 (UTC)
== Headers, header connectors, and pin headers ==
[[Image:Stiftleiste8x2gerade.jpg|thumb|right|8x2 Male [[Pin header|Pin Header]]]]
[[Image:Stiftwanne2x13v2.jpg|thumb|right|13x2 [[Insulation-displacement connector|IDC]] Connector ("Keyed and Shrouded Pin Header")]]
It seems there is a bit of a confusion on the wording of "pin header connectors".
A "header", without the word "pin", or "connector" is mainly used for a software construction, like a header of an e-mail, it is not normally used to describe a hardware connector. A "header connector" can be either a pin header, or the band-cable connector connected to a (boxed) pin header. It is also sometimes used for a "female pin header", that is a header without pins, but female receptacles instead of pins. Googling for pictures using "header connector" will normally produce "pin headers", except for the few cases where the header happens to be a female header. Headers are also normally associated with connectors, while pin headers can also be used for jumpering. On the raspberry PI the 2.54 millimeter spaced rows of holes are obviously intended for the male version of header connectors, thus "pin header connector" seems the description most fit. The first description also just mentioned "pins". [[User:Mahjongg|Mahjongg]] ([[User talk:Mahjongg|talk]]) 22:13, 10 January 2012 (UTC)
: "pin header" in this context is a very common term. I buy mine here: http://cpc.farnell.com/pin-headers-sockets [[User:Andy Dingley|Andy Dingley]] ([[User talk:Andy Dingley|talk]]) 22:51, 10 January 2012 (UTC)
::Yes, there are a trillion websites out there selling pin headers. Only an [[edge connector]] is cheaper (as its simply the edge of a PCB) than a pin header connector, so they are pretty common. If you only leave holes for them they are even cheaper.
::Pin header '''sockets''' are not pin headers though, they are the female counterparts for pin headers. They do not have simple pins, they have (brass) springs inside a hollow plastic "box", into which the pin of a pin header is inserted to make contact with the brass spring. [[User:Mahjongg|Mahjongg]] ([[User talk:Mahjongg|talk]]) 00:43, 11 January 2012 (UTC)
::: They sell headers as well as sockets. I don't get to re-write the URLs for the second-biggest (?) electronics component dealer in the UK, but I consider their use of the term pretty compelling evidence that the term "pin header" is a real one, in current use.
::: They're also often cheaper than edge connectors. Edge connectors really need to be plated if you want reliability, and for most production volumes (i.e. Raspberry Pis and Arduinos) it's cheaper to buy a pin header and use existing drill / solder steps than it is to send the boards out for extra plating. [[User:Andy Dingley|Andy Dingley]] ([[User talk:Andy Dingley|talk]]) 00:59, 11 January 2012 (UTC)
:::: Considering I just wrote the article [[pin header]] , triggered by the fact that I read this article and came to the conclusion that a [[pin header]] article did not exist, (and header was just a disambiguation page) I can safely say that I am also of the opinion that "pin headers" do exist. I have been using them in my designs for almost 30 years now. The term "header" is also sometimes used in this context, perhaps because if you want to mention the number of pins (for example 20) its a bit awkward to say something like a "20 pin pin header connector", its easier to say a "20 pin header connector". There are thousands of manufacturers of pin header connectors, many from China or Taiwan. Your point about gold plated edge connectors is true, but lately it has become less important, as many [[ROHS]] compatible PCB's that use SMT already are gold plated. If you look closely at the [[Fiduciary_marker#PCB|fiducial]]s, and the unpopulated single row pin header you will see that this is also the case for the Raspberry PI's board. I agree though that an edge connector should be heavier plated than the very thin plating used to assist soldering. Also edge connectors are normally bulkier. But true pin headers are still the most cost effective, (also considering the cost of board space) if you do not actually mount them to the board, but only provide the drill holes. [[User:Mahjongg|Mahjongg]] ([[User talk:Mahjongg|talk]]) 02:23, 11 January 2012 (UTC)
::::: "Pin Header" is just one of the many variants that have been used to describe the connector. Each manufacturer and part of the world appears to use various names for it. A lot of people that I know over the past decades call them headers, male headers, header strips, but NO ONE sits around arguing what to call them. [http://www.samtec.com/ Samtec] calls one group of parts SQUARE POST HEADER. You really can't generically call them square, because a person can use Round Machined Pin Headers. To be picky, it should be called "Male Pin Header", because they sure don't look like females to me. • [[User:Sbmeirow|<span style="color:#8D38C9;">Sbmeirow</span>]] • [[User talk:Sbmeirow|<span style="color:#8D38C9;White;">Talk</span>]] • 11:46, 11 January 2012 (UTC)
::::: Technically, if they are shipping the boards with a bunch of holes for connectors and nothing more. You can put Male Pin Headers, or Female Pin Sockets, or Shrouded IDC sockets, straight or right-angle, or any other connector on this planet that will fit in those holes on either the top or bottom side. I'm very amazed they pushed up a bunch of stuff next to the 2x13 header, thus preventing the placement of a keyed-shrouded [[Insulation-displacement connector|IDC]] socket, unless you put it on the bottom side or mount one with very long solder pins. Since this board is targeting schools and the non-engineers, it was a fail to not design it for a keyed connection, because I'm sure some noobie will plug into it 180-degrees and damage/destroy it. • [[User:Sbmeirow|<span style="color:#8D38C9;">Sbmeirow</span>]] • [[User talk:Sbmeirow|<span style="color:#8D38C9;White;">Talk</span>]] • 12:18, 11 January 2012 (UTC)
::::: If I used this board with a bunch of noobies and students, I would install a keyed connector. Because of mounting constraint issues, I would likely mount either a RIGHT-ANGLE version (to point the connector away from the board) or LONG-STRAIGHT-SOLDER-PIN version (to get the connector up higher in the air) of [http://www.samtec.com/documents/webfiles/pdf/TST_TH.PDF Samtec Shrouded Post Headers] or [http://www.samtec.com/documents/webfiles/pdf/ejh.pdf Samtec Shrouded IDC Ejector Header] style of connector. • [[User:Sbmeirow|<span style="color:#8D38C9;">Sbmeirow</span>]] • [[User talk:Sbmeirow|<span style="color:#8D38C9;White;">Talk</span>]] • 12:40, 11 January 2012 (UTC)
:::::: I agree that this very common type of connector/jumper-header system goes by many names, sometimes brand names such as [[Berg connector|Berg strips]] are also used, although later berg connectors were more often associated with the 4-pin power connector used for floppy disk drives. Some pin headers differentiate from generic pin headers by having small holes on one of their sides, and a plastic pin on the other side, so that they can be horizontally stacked together, these are often translucent green rather than black. Its a quite a common practice for pin headers to be optional, and not populated by default. It reduces system price which is quite important for a device as low priced as this one. Not all users will want to connect stuff to their system, or are able to solder. In many cases where in a school the connectors will be used its practical for the teacher to do the soldering, (or guide the students to do so) and he can then decide whether he wants or needs to use a polarized connectors. In any case, there are so many options by which these holes can be used, for shrouded angled connectors, or for long pins to connect to [[Arduino]] style shields, (piggy back boards) that its another valid reason the leave these connectors unpopulated. [[User:Mahjongg|Mahjongg]] ([[User talk:Mahjongg|talk]]) 15:42, 15 January 2012 (UTC)
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