- - The schematics is usually the single source of all logical information: - footprints, element refdes and values and connections (networks or nets). - A project is just a directory that holds at least the schematics, but - usually also the pcb layout file and scripts. -
- Start the new project by creating an empty directory. Start - gschem with an empty design and save it in the project directory. - Place the following symbols and edit/add these attributes: -
- Arrange and connect the pins as shown below. -
-
-
- Save the design as 7805.sch. -
- We are going to use a Makefile in this example to demonstrate - how to automate certain steps. In a fully automated project all - data exchange between the various tools (schematics editor, pcb-rnd, - simulators, etc.) is done by scripts. Generating the documentation - and exporting various other output like gerbers are usually automated - the same way. (As an alternative, all these can be done manually, from - the GUI as well.) -
- Create a new file called Makefile and edit it using your favorite text - editor to the following: -
-7805.lht: 7805.sch - gsch2pcb-rnd -m import 7805.sch - -clean: - rm -f 7805.cmd --
- The first rule calls the forward annotation utility, gsch2pcb-rnd to - create a forward annotation command file called 7805.cmd when the - schematics file is newer than the layout file (7805.lht). The second - rule removes such a command file to make the directory clean of - auto-generated temporary files. - -
- The layout process usually starts when there's at least a partially - finished schematics is available. The most common workflow is that - changes and improvements in the schematics are forward annotated to - the layout. -
- Start pcb-rnd. This will load the system-installed template board - as a new, empty design. Save it in the project directory as 7805.lht. -
- Start a shell (but don't close pcb-rnd); in the project directory, - type make. This will create 7805.cmd that contains a pcb-rnd - action script that can sync a board to the information extracted from - the schematics. -
- Back in pcb-rnd, type ":ExecuteFile(7805.cmd)" and press enter. The colon - will open the CLI entry where the ExecuteFile(filename) is an action that - will load the file named and execute each line as an action. -
- At the end of the process, the layout should have all footprints. Press - 'o' and the logical connections will show up as a "rats nest". - -
- Move the elements around. Pressing 'o' after some moves will re-optimize - the rats. As rats nest gets simpler and simpler, this can help choosing - the best placement. All components started out on the component (top) side. - Hover the mouse over the 0805 capacitors and press 'b' - this will send - them to the solder side. -
- After the placement, pick the solder layer to draw on and use the line tool - to draw the traces. Change the style to 'Power' or 'Fat' to get wider - traces. Press 'o' after drawing a few connections. When only the ground - network is left, use the rectangle tool to draw a large polygon on the - solder-gnd layer. Use the thermal tool to connect pins to the ground polygon. - The thermal tool does not work on SMD pads, they need to be connected using - lines. -
- When everything is connected, pressing 'o' will remove the last rat line. - The message log window also shows how many rats are remaining when 'o' - is pressed. The message log can be opened using the - Window/Message Log menu. - -
- - - - } } Index: 7805/index.html =================================================================== --- 7805/index.html (nonexistent) +++ 7805/index.html (revision 5748) @@ -0,0 +1,96 @@ +
+ The schematics is usually the single source of all logical information: + footprints, element refdes and values and connections (networks or nets). + A project is just a directory that holds at least the schematics, but + usually also the pcb layout file and scripts. +
+ Start the new project by creating an empty directory. Start + gschem with an empty design and save it in the project directory. + Place the following symbols and edit/add these attributes: +
+ Arrange and connect the pins as shown below. +
+
+
+ Save the design as 7805.sch. +
+ We are going to use a Makefile in this example to demonstrate + how to automate certain steps. In a fully automated project all + data exchange between the various tools (schematics editor, pcb-rnd, + simulators, etc.) is done by scripts. Generating the documentation + and exporting various other output like gerbers are usually automated + the same way. (As an alternative, all these can be done manually, from + the GUI as well.) +
+ Create a new file called Makefile and edit it using your favorite text + editor to the following: +
+7805.lht: 7805.sch + gsch2pcb-rnd -m import 7805.sch + +clean: + rm -f 7805.cmd ++
+ The first rule calls the forward annotation utility, gsch2pcb-rnd to + create a forward annotation command file called 7805.cmd when the + schematics file is newer than the layout file (7805.lht). The second + rule removes such a command file to make the directory clean of + auto-generated temporary files. + +
+ The layout process usually starts when there's at least a partially + finished schematics is available. The most common workflow is that + changes and improvements in the schematics are forward annotated to + the layout. +
+ Start pcb-rnd. This will load the system-installed template board + as a new, empty design. Save it in the project directory as 7805.lht. +
+ Start a shell (but don't close pcb-rnd); in the project directory, + type make. This will create 7805.cmd that contains a pcb-rnd + action script that can sync a board to the information extracted from + the schematics. +
+ Back in pcb-rnd, type ":ExecuteFile(7805.cmd)" and press enter. The colon + will open the CLI entry where the ExecuteFile(filename) is an action that + will load the file named and execute each line as an action. +
+ At the end of the process, the layout should have all footprints. Press + 'o' and the logical connections will show up as a "rats nest". + +
+ Move the elements around. Pressing 'o' after some moves will re-optimize + the rats. As rats nest gets simpler and simpler, this can help choosing + the best placement. All components started out on the component (top) side. + Hover the mouse over the 0805 capacitors and press 'b' - this will send + them to the solder side. +
+ After the placement, pick the solder layer to draw on and use the line tool + to draw the traces. Change the style to 'Power' or 'Fat' to get wider + traces. Press 'o' after drawing a few connections. When only the ground + network is left, use the rectangle tool to draw a large polygon on the + solder-gnd layer. Use the thermal tool to connect pins to the ground polygon. + The thermal tool does not work on SMD pads, they need to be connected using + lines. +
+ When everything is connected, pressing 'o' will remove the last rat line. + The message log window also shows how many rats are remaining when 'o' + is pressed. The message log can be opened using the + Window/Message Log menu. + +