If you're unfamiliar with stenciling solder paste we have a fabulous tutorial. gtp file is sent to a stencil fabricator to create the stainless steel or mylar solder paste stencil. Solder Paste StencilsĪre you doing SMD reflow? Need to order a stencil to apply the solder paste to your board? Turn on F.Paste in the Plot window to generate the top paste layer.
#Kicad pcb project download how to
In a later section, we'll go over how to edit the 'STAND-OFF' footprint to use a regular PTH hole. To correct this go back to the PCB layout, click on the Plotter, click 'Generate Drill File' and select the box that says 'Merge PTH and NPTH holes into one file'. used for the drill holes top of the board for mounting holes) was imported from the SparkFun Eagle library and KiCad seems to think it is a non-plated hole for some reason. We don't need NPTH for this design, so what happened? The 'STAND-OFF' footprint (i.e. While plated through holes (PTH) are common and cheap, NPTH requires an extra step in the PCB fabrication process and will often cost extra. This is sometimes required for advanced designs where thorough electrical isolation is needed. Non-plated through holes are holes on your PCB that do not have copper covering the vertical walls of the hole. * -NPTH.drl - The non-plated through hole drill file.drl - The standard EXCELLON drill file you need to send to PCB fab house. When generating the drill file for this design two files where generated:
Now, we need to deal with the two drill files. Review your work in GerbView to verify the fixes.To do this, edit the text properties and change the Style: to Normal. Change the top GND indicator so it's not italics.Make sure to change text to GND by right clicking the text, selecting Properties, changing the text, and clicking 'OK'. You can also copy text on the bottom silkscreen layer by right clicking it, selecting Duplicate, and placing text next to the GND pad. Click on Place -> Text, type "GND" in the Text: field, and click 'OK'. To do this, select the bottom silk layer (B.SilkS) in Pcbnew. Add the a silkscreen to the bottom layer for GND.Take a moment and return to the PCB layout window to edit the make these corrections. Whoops! Bottom silkscreen for GND is missing! The error message will show up in the window as an error indicating: " Via near track." Fix them by ripping up (press 'Delete') any traces near the vias and re-route them (press 'x'). ErrType(): Via near trackĪw shucks! What's wrong with my board? The vias marked with red arrows are too close to the traces near by. Press enter again to run the DRC with the default settings. Save yourself the layout time and rely on the PCB fab house to correctly fabricate your board. If you've got a complex board with tight layout challenges, it's better use the smaller trace/space and vias. That stated, we are seeing many PCB fab houses charge low prices for 7mil trace/space and 12mil vias. There's nothing worse than troubleshooting a faulty product and asking yourself: "I've tried every rework and soldering trick in the book, is it the PCB that's bad?" We design with 10mil trace/space in order to insure and reduce the probability that we'll see PCBs with errors on the production floor. And those errors can be hard to identify. Making PCBs is tricky and for each increment of tolerance you remove you increase the chances that the PCB (proto or not) will be fabricated with an error. Why design in 10mil trace/space when a fab house allows 8mil or smaller for the same price? You shouldn't need to go that small on your first board. We go smaller than this on many designs but if you're designing your first PCB, do not design it with 4mil traces and 8mil vias. In general, SparkFun designs boards with: Let's take a moment to talk trace width, trace spacing, and vias. Re-open the DRC window and you can now change the settings using imperial units. This will change all the units to inches. On the left tool menu of the PCB layout window, click on the 'in' button. If you'd prefer to see the settings in inches, close this window. Note: All the DRC settings are in millimeters.
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