Relay SPST form A

[vanepp]

Over all a good part but a few problems. This tutorial on parts making may help if you haven’t seen it:

Part creation howto part 1 breadboard and pcb

Someone in this forum post requested help to fix up a part. So while doing that I decided to record what I needed to do in order to fix the part to provide a tutorial to create new / fix broken parts. If you start from the Tarjeta S4A EDU.fzpz file posted in the above thread, you should be able to recreate my improved part posted in the same thread. I started by loading the original part in to Fritzing, that indicates breadboard is (at first look anyway) pretty good, but schematic and pcb are…

Starting in pcb, you are missing the copper1 group making this a single layer part (and thus no hole will be drilled for the pins!)

It needs to look like this to work

then the pin hole is too small (this is from the gerber output drill.txt file that specifies hole size)

original holes

; NON-PLATED HOLES START AT T1
; THROUGH (PLATED) HOLES START AT T100
M48
INCH
T100C0.038000
T101C0.021000
%

The 0.038in hole is the standard 0.1in header, the 0.021in hole is the current relay pin. From the relay data sheet the hole size should be 0.052in (1,3mm)

In Inkscape (which appears to be what you are using as an svg editor) the hole size is

hole_size = pad_diameter - (2 * stoke-width)

or in this case with a stroke-width of 20 (note that I rescaled the pcb svg to the standard Fritzing scale) that works out to

0.052 = 0.092 - (2 * 0.02)

so the pad diameter is 0.092in with a stroke width of 20. Which produces this gerber output

corrected holes

; NON-PLATED HOLES START AT T1
; THROUGH (PLATED) HOLES START AT T100
M48
INCH
T100C0.038000
T101C0.052000
%

Then the layerIds are missing in both breadboard and schematic. This will cause the part to not export as an image in Fritzing.

to fix it group the entire svg and name the group breadboard.

the same for schematic except the layerId is schematic

to

Last it is desirable to have a label in the .fzp file like this

  <label>RY</label>

Which will replace the part1 label with RY1 indicating a relay. All of these changes are included in this corrected part.

RELAY SPST form A-fixed.fzpz (21.8 KB)

because I didn’t change the moduleId you will need to delete the current part from your mine parts bin, then shutdown Fritzing answering yes to the save new part and save parts bin prompts then restarting Fritzing before it will let you load the new part.

Peter