kicad/pcbnew/python/plugins/mutualcap_button_wizard.py

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# Copyright 2019-2020 Julian Fellinger
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
import FootprintWizardBase
import pcbnew
from pcbnew import *
class MutualcapButtonWizard(FootprintWizardBase.FootprintWizard):
def GetName(self):
"""
Return footprint name.
This is specific to each footprint class, you need to implement this
"""
return "Mutualcap Touch Button"
def GetDescription(self):
"""
Return footprint description.
This is specific to each footprint class, you need to implement this
"""
return "Wizard for Mutual Capacitance Touch Buttons."
def GetValue(self):
return "TouchButton-{width:g}x{height:g}mm".format(
width = pcbnew.ToMM(self.pads["Width"]),
height= pcbnew.ToMM(self.pads["Height"])
)
def GenerateParameterList(self):
self.AddParam("Pads", "Width", self.uMM, 12)
self.AddParam("Pads", "Height", self.uMM, 12)
self.AddParam("Pads", "Outer electrode width", self.uMM, 1)
self.AddParam("Pads", "Inner electrode width", self.uMM, 0.1)
self.AddParam("Pads", "Draw line around button", self.uBool, True)
@property
def pads(self):
return self.parameters["Pads"]
# build a rectangular pad
def smdRectPad(self,module,size,pos,name):
pad = D_PAD(module)
pad.SetSize(size)
pad.SetShape(PAD_SHAPE_RECT)
pad.SetAttribute(PAD_ATTRIB_SMD)
layerset = pcbnew.LSET()
layerset.AddLayer(pcbnew.F_Cu)
pad.SetLayerSet(layerset)
pad.SetPos0(pos)
pad.SetPosition(pos)
pad.SetName(name)
return pad
# This method checks the parameters provided to wizard and set errors
def CheckParameters(self):
pass
def BuildThisFootprint(self):
# o refers to the outer (drive) electrode
# i refers to the inner (receive) electrode
w = self.pads["Width"]
h = self.pads["Height"]
oew = self.pads["Outer electrode width"]
iew = self.pads["Inner electrode width"]
drawBox = self.pads["Draw line around button"]
oFingerCount = int((w-3*oew-iew)/(1.5*oew+iew))
oBorderWidth = (w-oew-iew-oFingerCount*(1.5*oew+iew))/2
clearance = oew/2
###border h
self.module.SetLayer(F_Cu)
size_pad = pcbnew.wxSize( w, oew )
self.module.Add(self.smdRectPad(self.module,size_pad, pcbnew.wxPoint(0,(-h/2)+oew/2),str(1)))
self.module.Add(self.smdRectPad(self.module,size_pad, pcbnew.wxPoint(0,( h/2)-oew/2),str(1)))
###border v
size_pad = pcbnew.wxSize(oBorderWidth, h-2*oew)
self.module.Add(self.smdRectPad(self.module,size_pad, pcbnew.wxPoint((-w/2)+oBorderWidth/2,0),str(1)))
self.module.Add(self.smdRectPad(self.module,size_pad, pcbnew.wxPoint(( w/2)-oBorderWidth/2,0),str(1)))
xPos = -w/2+oBorderWidth+clearance+iew
oFingerSize = pcbnew.wxSize(oew/2, h-oew-iew-2*clearance-oew)
iFingerSize = pcbnew.wxSize(iew,h-2*oew-2*clearance)
#horizontal inner electrode trace
self.module.Add(self.smdRectPad(self.module,pcbnew.wxSize(w-2*oBorderWidth-2*clearance,iew), pcbnew.wxPoint(0,h/2-oew-clearance-iew/2),str(2)))
for i in range(0,oFingerCount):
#inner electrode fingers
self.module.Add(self.smdRectPad(self.module,iFingerSize, pcbnew.wxPoint(xPos-iew/2 ,0),str(2)))
#outer electrode fingers
self.module.Add(self.smdRectPad(self.module,oFingerSize, pcbnew.wxPoint(xPos+oew*0.75,-w/h-oew-iew/2+oew/2),str(1)))
xPos += oew*1.5+iew
#rightmost inner electrode finger
self.module.Add(self.smdRectPad(self.module,iFingerSize, pcbnew.wxPoint(xPos-iew/2,0),str(2)))
textSize = self.GetTextSize()
self.draw.Value(0, h/2+textSize, textSize)
self.draw.Reference(0, -h/2-textSize, textSize)
#optionally draw silkscreen line around button
if(drawBox):
self.draw.Box(0,0,w,h)
MutualcapButtonWizard().register()