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| 14:19.47 | T0mW | ho hum, "Kernel panic - not syncing: Attempted to kill init!" |
| 14:19.54 | T0mW | been here before... heh |
| 15:26.38 | prpplague^2 | T0mW: hey bud |
| 15:26.44 | prpplague^2 | T0mW: glad you are here |
| 15:26.48 | T0mW | prpplague^2: hey dude |
| 15:26.53 | prpplague^2 | T0mW: question for ya |
| 15:26.59 | T0mW | prpplague^2: ok |
| 15:27.07 | T0mW | prpplague^2: sometimes I know things |
| 15:27.35 | prpplague^2 | T0mW: http://www.pololu.com/picture/0J926.649.png |
| 15:28.08 | prpplague^2 | T0mW: was looking at using a 42 mil pad with a 28 mil drill |
| 15:28.34 | prpplague^2 | T0mW: think that'd work? |
| 15:29.07 | prpplague^2 | T0mW: the other option is to space the holes out at 2mm and do something like a 39mil drill and and 57 mil pad |
| 15:29.27 | T0mW | naw, stick with 28 |
| 15:29.45 | T0mW | plenty of room, leads spec at 20mil |
| 15:29.47 | prpplague^2 | T0mW: think that is good to get past the 0.7mm spacer? |
| 15:29.58 | prpplague^2 | T0mW: the spacer is the issue |
| 15:30.24 | T0mW | prpplague^2: spacer on all leads? |
| 15:30.39 | prpplague^2 | T0mW: yea |
| 15:31.35 | T0mW | hmm |
| 15:31.46 | prpplague^2 | T0mW: hehe, thats what i said |
| 15:32.14 | T0mW | prpplague^2: what purpose does the spacer serve? |
| 15:33.04 | T0mW | prpplague^2: is it to set the height of the LED above the board surface at something higher than the lead-stops offer? |
| 15:33.38 | prpplague^2 | T0mW: basically it gives you two options, one of mounting the LED right next to the PCB using a larger drill size, the other is to allow it to stand off from the PCB to make it easier to stick through a plastic case |
| 15:34.33 | prpplague^2 | T0mW: basically you use a 28 mil drill if you want it flush, use 25 if you want it to stand off the board |
| 15:35.35 | T0mW | prpplague^2: if I wanted to set the height of the LED above board, I would consider using a plastic tube with a 0.170" ID, stick all four leads down the tube and have the LED base rest on the rim of the tube. |
| 15:35.36 | prpplague^2 | T0mW: hey, i gotta run to the assembly house and check on some kits, i'll be back in a bit, think on it and see what you come up with |
| 15:36.05 | prpplague^2 | T0mW: that would be my choice as well |
| 15:36.17 | prpplague^2 | T0mW: but this seems to be the standard for the dual and tri colored leds |
| 15:36.20 | T0mW | easier, more mechanically stable |
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| 15:36.55 | prpplague^2 | gotta run, bbiab |
| 15:36.56 | T0mW | they do make molded standoffs for LEDs, IIRC |
| 15:37.02 | T0mW | will be here. |
| 15:37.12 | prpplague^2 | T0mW: yea, thing is i want to mount flush |
| 15:37.19 | prpplague^2 | T0mW: i don't want to do the stand off |
| 15:38.02 | prpplague^2 | T0mW: i just wanted to make sure that a 28 mil drill and a 42 mil pad wouldn't be a problem for the board house |
| 15:38.21 | T0mW | http://media.digikey.com/photos/Keystone%20Elect%20Photos/8915.JPG |
| 15:38.49 | prpplague^2 | T0mW: yea if i wanted to do the stand off that is what i would use as well |
| 15:38.58 | T0mW | shouldn't be problem, just need your pad-pad spacing requirement. |
| 15:39.06 | T0mW | shouldn't be problem, just need to meet your pad-pad spacing requirement. |
| 15:39.52 | T0mW | prpplague^2: use a styrene tube, get them at model airplane supply houses, heh. |
| 15:40.06 | prpplague^2 | hehe |
| 15:40.24 | T0mW | small tube encircling two lead |
| 15:40.25 | T0mW | s |
| 15:40.32 | T0mW | :P |
| 15:40.40 | prpplague^2 | T0mW: for the stand off? |
| 15:40.45 | T0mW | sure |
| 15:40.53 | prpplague^2 | doesn't want to do a standoff |
| 15:40.58 | prpplague^2 | i just want to mount it flush |
| 15:41.24 | T0mW | oh, you need to clear that lead-stop? |
| 15:41.33 | prpplague^2 | yes |
| 15:41.34 | T0mW | ah |
| 15:42.43 | T0mW | doing math |
| 15:43.46 | prpplague^2 | T0mW: hey i have to really go, i'll be back in an hour or so |
| 15:43.49 | prpplague^2 | T0mW: later |
| 15:43.55 | T0mW | later |
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| 17:10.10 | prpplague | T0mW: get your math done? |
| 18:31.43 | T0mW | prpplague: yeah, you should have no problem with the 6mil spacing. |
| 18:32.15 | prpplague | T0mW: thats what i thought, i just wanted someone else to confirm |
| 18:32.25 | T0mW | wanders off again |
| 18:32.32 | prpplague | T0mW: thanks |
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| 19:18.09 | gkwhc | Hi, I just started using the LPCxpresso and the CMSIS seems very overwhelming to me, not to mention it's poorly documented. Suggest any guides? I have been trying to code a blinky using the CMSIS library without success... |
| 19:36.43 | MonMotha | prpplague: did you get your PCB related questions answered? |
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| 19:47.37 | prpplague | MonMotha: T0mW seems to have confirmed my findings |
| 19:47.43 | prpplague | MonMotha: you are welcome to answer as well |
| 19:48.28 | MonMotha | looking back up, the biggest thing I see is that you may need to check with your PCB fabricator regarding drill size tolerance if a 25 vs. 28mil hole matters |
| 19:50.16 | MonMotha | so I'd agree with the assessment to use a standoff if you want space, rather than rely on that lead crimp |
| 19:51.18 | MonMotha | but I guess you just want it flush, so make sure you've got a large enough drill spec to that even with tolerance, it'll pass |
| 19:59.18 | prpplague | MonMotha: yea |
| 20:00.05 | prpplague | MonMotha: i think probably what i am going to do is use 2mm spacing and use something like 32 dril and 50 pad |
| 20:00.21 | prpplague | MonMotha: checked the footprints from several other manufacturers of the same style of led |
| 20:00.26 | prpplague | MonMotha: thats what they recommend |
| 20:00.56 | MonMotha | that's about what I was going to suggest |
| 20:01.14 | MonMotha | 32 drill, gives you 3mil down (which is a fairly typical tolerance) and still 1mil of buffer |
| 20:01.15 | prpplague | MonMotha: the eagle footprint that SFE provides uses the 2mm configuration |
| 20:01.36 | MonMotha | then the pad size is a bit more up in the air. For a semi-mechanical part like that, you'll want it largeish. |
| 20:02.13 | MonMotha | and I take it you'll be lead forming them? |
| 20:02.18 | prpplague | yea, easier for the assembly as well |
| 20:02.33 | MonMotha | indeed |
| 20:02.50 | MonMotha | I tried to do a TO-92 outline with the package spacing (no lead forming) once. Yeah, that doesn't work well |
| 20:02.57 | prpplague | MonMotha: well 2mm is close enough to the original 1.27mm that there won;t be too much bending |
| 20:03.06 | prpplague | MonMotha: already tested with a 2mm protoboard |
| 20:03.09 | MonMotha | right. You may be able to just kinda bend and shove into the PCB |
| 20:03.12 | prpplague | MonMotha: fits pretty nicely |
| 20:03.16 | MonMotha | rather than actually form them |
| 20:03.41 | MonMotha | you could also consider semi-oval shaped pads |
| 20:03.49 | MonMotha | i.e. a rectangle with a half circle on each end |
| 20:04.06 | MonMotha | I do that for single row 0.05" headers, often times |
| 20:04.06 | prpplague | MonMotha: yea i considered that as well |
| 20:05.21 | MonMotha | spreading it out will still be easier for assembly (both hand and automated) |
| 20:06.55 | prpplague | MonMotha: yea, that is my thought |
| 20:07.02 | prpplague | MonMotha: it isn't really a space issue |
| 20:07.11 | prpplague | MonMotha: more of a cost and ease |
| 20:07.17 | MonMotha | ah, then yeah, go for the 2mm space |
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| 20:11.16 | prpplague | MonMotha: see /msg |
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