zprobe: improvised digital high-Z probe

- zprobe.pro, zprobe.sch, zprobe.cmp, zprobe.brd: Z-probe design
- 74hc04-3.lib: schematics symbol for triple 7404-style inverter
- ssop8-p-0_50a.fpd: footprint for Toshiba TC7W04FK
- Makefile: combined design automation and module conversion

zprobe/Makefile

@@ -0,0 +1,34 @@
+PLOT_BRD = pcbnew --plot=ps_a4 --ps-pads-drill-opt=none --fill-all-zones
+
+NAME = zprobe
+
+.PHONY:		all sch brd front back clean
+
+all:		ssop8-p-0_50a.mod
+		@echo "make what ? target: sch brd front back clean"
+		@exit 1
+
+%.mod:		%.fpd
+		fped -k $< >$@ || { rm -f $@; exit 1; }
+
+sch:
+		eeschema `pwd`/$(NAME).sch
+
+brd:
+		pcbnew `pwd`/$(NAME).brd
+
+front:		$(NAME)-Front.ps
+		lpr $<
+
+back:		$(NAME)-Back.ps
+		lpr $<
+
+%-Front.ps:	%.brd
+		$(PLOT_BRD) -l Front --mirror $<
+
+%-Back.ps:	%.brd
+		$(PLOT_BRD) -l Back $<
+
+clean:
+		rm -f $(NAME)-Front.ps $(NAME)-Back.ps
+		rm -f $(NAME).drl $(NAME)-PCB_Edges.gbr