Amega328p-au shorted pins ?

Hi James,

I think it's probably ok. If you place the crystal where you want it, near the IC pins and then the caps the other side where you want them, if you then press the ratsnest button or type RAT <return> you should see it re-optimise the air wires to the order you expect.

The other thing to note is in the image of the schematic above it is warning about forward and back annotation being severed. You need to make sure you always have both the schematic and board open and never make any changes that will affect the netlist when one or the other is closed otherwise you will end up in a mess.

Best Regards,

Rachael

Thank you for the note.

Still need to learn about the options the program has yet plus need to orient my head to seeing a circuit rather than a diagram.

This has been a big transition to me since my projects were mostly been accomplished using diagrams rather than schematics.

I`ll get used to this yet.

Appreciate the help once again.I need to adjust my eyes and look this over a bit closer.

Auto routing helped a lot so far rather than a spaghetti of lines

Also,being very careful when checking from schem to board not to change anything to goof it all up.

After several days and many hours I am giving up on Eagle.

My project is too simple and struggling with this software is making it much harder than it should be.

This has been tried on 3 machines to eliminate OS as the cause.Searched high and low for footprints and symbols for my specific components.

Read every forum post and video and nothing works like is said or seen.

In the end,I took 3 simple components which were a pair of identical 5 pin headers and a 10 pin IC (Si5351a) and simply connected the pins to just that all by itself.

I get nothing but errors all day long.

Just downloaded the complete Adafruit Si5351a ,BRD/SCHEM and ran it into Eagle using all and every method learned from videos and forums and still it shows the same errors.

I changed drills,mils and mm`s and other settings and sizes with no results...not even slight changes.

Since my project is not protecting the universe,going to mount these tiny components onto thin light material using glue and soldering point to point.

The time spent on software and computers was time spent soldering

Thanks for the help but time to move forward.

I think someone needs to try the Si5351a synthesizer chip first and could be Eagle free version is incapable of using it?

Hi James,

Can you post up a sample of the errors you are seeing here please so we can see what's happening?

Also, can you attach the .lbr file you found containing the Si5351a and I will take a look at it.

Best Regards,

Rachael

I think this is what I have been using - https://www.snapeda.com/parts/SI5351A-B-GT/Silicon%20Labs/view-part/

Also,tried using this schematic and get the very same clearance issues with the Si5351a.

https://github.com/adafruit/Adafruit-Si5351A-Clock-Generator-Breakout-PCB

I even tried to route my own but can not seem to make the traces small enough.They end up touching.But even using the plain Si5351a chip on a pair of 5 pin headers the clearance error continues.

I just can not seem to fix this error.

Had the entire schematic made and remade several times and getting tired.Tried the board portion equally as much and everything in between.

Following the video steps exactly and getting different results.

I should describe this circuit.My goal is to shrink down a circuit I already successfully use for high altitude balloons.

It consists of 3 stages,GPS SI5351 Atmega328p-au

My current working setup is crude and was hoping to go 100% surface mount to drastically reduce weight.My total weight now is about 28 grams and feel surface mount will greatly reduce it even more.The reason for this weight loss is also reducing balloon size and helium reduction therefore increasing altitudes.I only get around 30k feet and need to get at least 35 - 40k to avoid storms.

That is the plan anyhow.

Here you see my old build which may give you an idea what the goal is.

So if I hand solder onto construction paper or plain phenolic board,it will all work the same way.

Having one neat PCB was just a luxury and seems out of my reach

Jim

I`ll just upload my entire schematic.

This is not the same as it was since I decided to eliminate traces and thought it would be easier to section out the circuit into 3 sections.

Rather than a bunch of traces,tried using headers where later I can hand solder jumpers to avoid all these design issues.Everything will still be on one PCB but some hand tracing involved.

It seemed to reduce the headaches except that dreaded Si5351a clearance stuff.

Anyhow,here it is.

Found another possibility for footprint - CAD/CAE Schematic Footprints and Symbols | Silicon Labs

But another program to figure out to go with it .

Another Si5351a library - Starting to Build my Personal EagleCAD Library — Tristan Robitaille

Hi James,

Sorry, I haven't been ignoring your posts, I've been out this evening. I'll take a look at what you've posted up in the morning :-)

Best Regards,

Rachael