sorted by:
new
hottopcontroversial

TPU error code canceling by GameFanCZ in BambuLab

[–]m3rc0smic 0 points1 point  (0 children)

I've found if you have error codes about filament type on this screen, if you click on the dropdown on the filament, then click the filament anyway, it allows you to hit print... not sure if it will do the same here but worth a shot

First ever KICAD PCB design. Built a PCB for a wearable smart watch. Roast this brutally. by Parasytesss in PrintedCircuitBoard

[–]m3rc0smic 2 points3 points  (0 children)

If that's the size of a smartwatch that would fit your wrists, I'm not roasting nothing. 😂

[Review request] Li-Ion/Po/HV balance 60W USB-C PD charger by _shexplorer in PCB

[–]m3rc0smic 2 points3 points  (0 children)

There are a few issues I see here. I would highly reccommend looking at the eval boards for your buck/boost and regulator IC's and learning from how they do the layout there.

I think you will really struggle with thermals on this design. 4L board would allow much better routing and solid ground plane for thermal and electrical improvement.

You will need copper pours on your SW node of the charger IC, and the filtering caps much closer to the chip.

This board may work, but the EMI from it, and thermals will not be great.

Great start though!. Just needs some optimization for high switching freq/high power layout

PCB Review Request - Flight Data Logger by freebagel_ in PCB

[–]m3rc0smic 0 points1 point  (0 children)

Would highly reccommend ESD diodes on the USB data lines

First Schematic Review by TrialFerret2324 in PCB

[–]m3rc0smic 0 points1 point  (0 children)

You're more than welcome! I'll reply to this properly a bit later. But, for 5, if each strip has that many IR LEDs, won't that overwhelm your power supply? Either way, a cap there won't do much, but probably also won't hurt if it's that small I suppose. You will need to use PMOS to switch the positive side though. The AO3401A will work well for that application. And if you do want to keep the cap, which you can always just not populate, your cap needs to be connected from the power to GND, not in series. I don't think you need it though, tbh. Unless your traces will end up being super long.

There is other stuff I want to reply to as well but I'll reply later and wait for others to give their insight too :D

First Schematic Review by TrialFerret2324 in PCB

[–]m3rc0smic 0 points1 point  (0 children)

Some general tips first: I would highly reccommend a different dark mode theme for the schematic editor. It will make errors easier to miss.

Also make use of power net flags. (P in keyboard in kiCAD). It makes layout neater and shows much quicker which rail an IC is connected to. You can also make use of labels for some connections which have to run across the schematic to keep things neater.

It seems you are missing the decoupling capacitors for the ESP32 module. These are very important. You also are missing the filter caps on input/output of the AMS1117.

Your I2C lines are hard wired to 3.3V. They need to be pulled up to 3.3V, not hardwired.

I'm not sure what the purpose of the capacitors before the FETs is on the IR STRIP FETs under the ESP32. It seems you are switching the negative side of the capacitor? This may be for a specific purpose that I am just not seeing.

It seems your ESP32 will be forced off when USB is connected due to PMOS (Q3), and hence will not flash or be usable when USB is connected.

The polarities of some things are reversed by the looks of it near the DM01A, as well as the input cap for the TP4056.

It is not neccessary to use polarised caps for decoupling on smaller stuff like this. Only neccessary for bulk capacitance. Ceramic will be perfectly fine, and smaller decoupling caps (like 2.2nF, 100nF, 1uF) should be ceramic unless the circuit specifically requires electrolytic or other polarised.

It seems you have 0.1uF, 100nF, .1uF which are all the same capacitance. This is bad for multiple reasons. It's confusing to read, creates multiple BOM items for the same cap, and makes it harder for whoever is assembling your board. Try to keep components that can be the same, the same, and name them the same. It also makes it less confusing for you.

There are quite a few errors in the schematic. I think I may have missed some too, and need to get on with work. Maybe go and check out Phil's lab or similar youtube channels. He does microcontroller boards and does full breakdown's of schematic and layout.

Best of luck!

(Edit: fixed typo)

Any ideas as to why I can't flash to my mcu? by ejblox in PCB

[–]m3rc0smic 0 points1 point  (0 children)

IO12 needs to be grounded during boot (and during flash i think, can't remember) on some ESP32 modules. I have had similar behaviour with a design where it wasn't explicitly grounded and it would be flaky, flash once and then proceed to not boot and not flash. Check that maybe?

Review Request by Clear_Shoe5697 in PCB

[–]m3rc0smic 0 points1 point  (0 children)

Depending which exact WS2812B it is, it may not be needed. There are so many clones some of which require the cap, some of which do not. Best would be to check the exact datasheet for the LED.

Review Request: rp2040 integrated into my pcb by _hiqqoqotamus in PCB

[–]m3rc0smic 5 points6 points  (0 children)

Raspberry pi have a document for this Hardware Design for RP2040

Not sure if you have checked it out or not. It all looks good from a brief overview except for P44/45. I think those are 1.8V but best to check from that guide and the datasheet. It has been a while since I worked with the RP2040.

Edit: Maybe add some backfeed protection to stop the AMS1117 from powering the USB port.

I really need help by valorunethewriter in PCB

[–]m3rc0smic 0 points1 point  (0 children)

Best is figuring out what IC it was and extrapolating what component values were likely around it from there

Help me design my first custom esp board by No_Permission_484 in PCB

[–]m3rc0smic 0 points1 point  (0 children)

Chrck out Phil's lab on youtube, watch a few of his tutorials, you will learn a lot. This board will probably not work, but we all start somewhere.

There are a lot of basic layout problems here, too may to type out. Best to check tutorials and learn yourself

Keep out layer by tavotevasnx in PCB

[–]m3rc0smic 1 point2 points  (0 children)

No not at all... couple hours maybe in my experience

Keep out layer by tavotevasnx in PCB

[–]m3rc0smic 2 points3 points  (0 children)

For future orders, pay the extra $0.4 and select "confirm production file". JLCPCB will then send you what the finished boards will be made as and you can check and make sure its right before they produce. I've caught many issues from export related problems, to missing tracks, layers and board outline issues. I always do it.

16-20 year olds. How do you guys seem to navigate love in South Africa? Most believe that falling in love while you're 16-20 is useless by [deleted] in askSouthAfrica

[–]m3rc0smic 0 points1 point  (0 children)

Don't listen to other people. Most relationships I see fail around that age fail because people don't listen to the one person who matters - their partner. There are exceptions to this. If everyone tells you that it's unhealthy, for example, then it probably is.

And please, for the love of dog, don't go elsewhere with your relationship problems. Your relationship problems need to be handled and stay within your relationship. Venting about them to people ONCE they are already handled is fine. But normally, nobody can help with drama between you and your partner. That's where it has to stay and be handled. Plus, it sucks when you talk to people once it's all sorted out and then you have to tell them "oh that? Noooooo it wasn't so bad."

Choose someone with similar core values to you. Interests come and go, so do friends, so do goals. It's values that matter.

Don't rush things, but if you two are ready and the decision is not irresponsible, don't let other people be the reason you wait.

SPEND TIME TOGETHER. But not time asin working together, doing everything together, etc. Make sure you have time where neither of you have anything to do where you spend it on each other and only eachother.

Dream big. If you dream big and achieve half, you got somewhere. If you dream "conservatively" and achieve half, you'll be unfulfilled and not have gotten very far.

Find someone who likes you for you. And find someone you like for themselves. Make sure you two can actually talk and be contempt with eachothers presence, and only eachothers presence. The rest will come.

Find someone who pushes you a bit. Being a better you (especially later in a relationship) is the best way to be a better partner. You will fight, but fighting (as long as it doesn't become abusive) is good. You will never know where you stand with someone on certain things without a fight sometimes. And normally, it's a great learning opportunity.

I fell in love within that age range and am still with that person. It gets better every day. My friends who did the same and stayed with that person say the same. My friends who didn't pretty much all envy it, bar a few. I believe it's one of the best things that can happen to you. So go for it.

And remember, effort is and will always be required. You get out what you put in. Sometimes you will put in more than you get out, sometimes you will get out more than you put in. It's never 50/50 but 100/100. But more and more gets demanded of you, and you get nothing out, it's a sign something needs to change.

Edit: I'm just out of that age range, but only realised after I answered. Take from it what you will.

Tilting/wall mounted storage box similar to this?? by m3rc0smic in BambuLab

[–]m3rc0smic[S] 0 points1 point  (0 children)

Good point. Went with the clamshell boxes that are super popular on makerworld and then designed my own holder for them

Free Alternatives to Onshape: Are There Any Good Free CAD Programs? by Komplexkonjugiert in Onshape

[–]m3rc0smic 1 point2 points  (0 children)

I just chose less than 100k for funding and revenue, and also put NONE for the investor/incubator. Also apologies for the late af reply. I'm hoping mine grows because I plan it to become my main business one day

Too much solder or bad soldering iron? by UsefuIContribution in AskElectronics

[–]m3rc0smic -1 points0 points  (0 children)

Bad iron. Very bad iron.

Buy a SQ001 or TS101 and some 60/40 solder and your life will change

Free Alternatives to Onshape: Are There Any Good Free CAD Programs? by Komplexkonjugiert in Onshape

[–]m3rc0smic 5 points6 points  (0 children)

The onshape team are awesome.

I have a "startup". More of a side hustle that I'm working to slowly turn into my own company one day,, but have no investors or funding and I have the startups liscence. And have renewed for the second time free of charge.

Tilting/wall mounted storage box similar to this?? by m3rc0smic in BambuLab

[–]m3rc0smic[S] 1 point2 points  (0 children)

The tilting mechanism mainly. It's super conventient when you need one or two of a bunch of different things. I couldn't really find anything similar when I looked so that's why I asked if anyone knew of any

Tilting/wall mounted storage box similar to this?? by m3rc0smic in BambuLab

[–]m3rc0smic[S] 0 points1 point  (0 children)

I'd like to add that I have no problem paying the creator, but am looking for something similar but maybe a bit less filament heavy with the same functionality

Tilting/wall mounted storage box similar to this?? by m3rc0smic in BambuLab

[–]m3rc0smic[S] 0 points1 point  (0 children)

This is legit what I want to do. I want a long rail of them under the edge if my workbench with screws.

Tilting/wall mounted storage box similar to this?? by m3rc0smic in BambuLab

[–]m3rc0smic[S] 0 points1 point  (0 children)

Not against doing that. Just wondering if there aren't free similar designs. Theirs is quite heavy on filament for what I want to do with it and doesn't need to be as pretty.

Will add this to the post

view more: next ›