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Newbie help - Mixing SMD and TH components
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megahertz 6 years ago
Hi all, What I have is pretty simple starter project to start me on my journey of making PCB's, it's an AND gate made up of a couple of switches and 2 transistors, some resistors and and LED. I have a CR2032 battery holder to provide power. When i first started I had the battery holder on top which is SMD and it just has pads to solder to, the rest of the components are through hole, but at some point I realized the pads for the through hole components should probably be on the bottom. So rather than routing stuff on top I moved the battery holder to the bottom and figured I would just do all the routing on the bottom, with the silk screen layer on top. For some reason when i do this the auto-router just gets confused and never routes the project, so I am thinking I have something wrong. The pads for the through hole components seem to be set for multilayer and I set all the rats nests to be on the bottom layer so i thought stuff would just automagically work. =) I made the project public if someone has time to look (if needed) [https://easyeda.com/megahertz/Gate-Demo-1.0](https://easyeda.com/megahertz/Gate-Demo-1.0) Appreciate any help. =) Gerald
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royster59 6 years ago
    I'm new to this myself, so I'm not real hip on the lingo of the program. But, when you convert your Schematic to PCB it'll give you a board with all your components lined up underneath it. you'll notice that the solder pads for your battery holder are RED. Your battery solder pads need to be BLUE so the program will recognize that solder point to be on the bottom.     To change this, double click the RED squares for your battery holder to open the properties for that solder point. Change the "Layer" option to "Bottom layer" then click "Update". you will need to do this for both red squares on your battery holder. Then run auto router. RED indicates the soldering will be done on the TOP layer BLUE indicates BOTTOM layer. [https://easyeda.com/royster59/gate-demo](https://easyeda.com/royster59/gate-demo) check it out, I updated it and saved it to my archive in case my explanation confused you more. Cheers!
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megahertz 6 years ago
Yep, understood all that. =) Sorry I've been playing with the layout a bit since posting this, but I did have the battery holder on the bottom side and the pads were blue, which is exactly what I wanted, except the auto-router wouldn't route any of the components. =( I'll give it a shot again.
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megahertz 6 years ago
Yeah, no dice, soon as i put the battery holder on the bottom layer, nothing will route. All the other components pads are set for Multi-layer so I would expect them to just get routed on the bottom. I think I'm just missing something.
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royster59 6 years ago
as am I, apparently... don't give up. a senior member may pop in to show us the solution. I'm sure it's simple, just need to get more familiar with the software i guess. let me know when you get it, cause i'm gonna tinker with it for a bit again myself.
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royster59 6 years ago
ok, i think i fingered it out bro. This is something I ran into when I first started learning this software. EasyEDA is a web based program, meaning the program itself is stored on and ran from a remote server. it uses your computer for a majority of the processing. but certain actions are processed via the server's processor. When a lot of users are pegging the server at the same time for the same action, we all gotta wait in line. Auto router is one of those actions. (don't take my word as gospel, i'm meerly speculating here). But I've noticed on peak times, like fridays, weekends... etc. Autorouter takes FOREVER to do it's thing. and if the project to be routed is a complex one, it'll repeatedly time out. I was able to get auto-router to give me results without timing out by un-checking the "Top Layer" check box in the "Auto-router dialog box." Since we do not have any top layer components to be included. [https://easyeda.com/royster59/gate-demo](https://easyeda.com/royster59/gate-demo) Just a friendly word of advice though, auto-router can turn out to be a crutch when you move on to more advanced circuits. In more complex circuits, auto-router will give you retarted results which you will end up sifting through to re-route and re-place manually, and by the time you get it sorted out. You will realize you could have just placed each component on your board one by one, methodically following your circuit path, routing as you go, and have it completed in less time, with less headache than the "short-cut" got you. (BTW, this advice was given to me by someone when I first started, so pass it on :) On the left side of the screen, there is a button that says design manager, when i found this section, it showed me the way. so-to-speak. Happy Tracing MegaHertz
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megahertz 6 years ago
I've tried running the local router on my PC, still same issue... I've also unchecked the top layer as well. =( Yeah I realize that auto router down the line is going to be a bad idea based on reading I have done in the past. I was just relying on it for this simple circuit to somewhat validate what I was doing was the correct way to go about things.
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megahertz 6 years ago
Ehh, now it works, tried it on yours and then tried mine.... Works as expected when using cloud in either case. Local still seems broken, will have to play with it some more but its progress. I know the cloud can get busy, but I've been trying for about 24 hours now heh. I do appreciate the help. =) Gerald
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royster59 6 years ago
auto router, sooo did it for me. only changes i made were, I altered the battery holder pads to bottom layer, clicked auto router, unchecked top layer, started auto router, waited an unreasonable amount of time, And she just did it for me. I mean, if me and auto-router were out on a date, I would have had to cover her with the restaurants table cloth. Thats how easy she gave up the results for me. =)
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megahertz 6 years ago
Haha, indeed she did =) I think maybe what I was missing was unchecking the top layer in the autorouter (I swore I thought i did on my many other attempts), which is kinda wierd, because it still should have routed stuff because everything was only on the bottom...
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royster59 6 years ago
nice, awesome to hear you got it. i'm glad to help, I always learn something new when helping others.
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royster59 6 years ago
i bet if you get it to route without un-checking the top layer, it'll route it,and it'll probably use the top layer to connect all the ground points into a ground plane.
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andyfierman 6 years ago
One point: when moving components from one side of the PCB to the other, select the whole component by clicking on the yellow silkscreen outline, not just the individual pads. Also, this might help: [https://easyeda\.com/andyfierman/Welcome\_to\_EasyEDA\-31e1288f882e49e582699b8eb7fe9b1f](https://easyeda.com/andyfierman/Welcome_to_EasyEDA-31e1288f882e49e582699b8eb7fe9b1f)
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