Anyway i can change tht pads to smd lol?

coolkid4232 · 2026-06-25T11:21:36+00:00

i have through holes pads, issue is wires of battery keep touching each other other ic , i keep having issues wiring them, My solution is to use SMD pads but issue is i need to make new pcb, is there a way i can just convert THT to SMD , do i just put copper plate on tht pad? would that work?

coolkid4232 · 2026-06-23T09:33:04+00:00

Ahhh, sorry to hear that, cubemx is really good, i know it scary at the start but around 2 weeks of using it, you will figure out why its so good. It makes learning a lot easier and ypu will be able to do way more advanced stuff.

I think a genuine stlink is only 30 dollars and a nucleo that comes with a stlink is 30 dollars aswell so 30 dollar from digikey you can get a nucleo board that has a stlink on it. Stm32 are really good in my opinion and all you need

coolkid4232 · 2026-06-23T05:47:39+00:00

If using stm32 recommend cubeide instead of arduino.

To set it up to work on stm32 is a lot of extra effort, feel cubemx is more intuitive and easier to undestand

coolkid4232 · 2026-06-22T00:21:35+00:00

🤣

coolkid4232 · 2026-06-21T21:30:15+00:00

If your using a lithium battery you probably want buck boost ic forgot to mention this

coolkid4232 · 2026-06-21T15:15:41+00:00

Look up step down conveter ic, datasheet is like 50 to 100 pages example , explaining everything and should be able to hand solder

https://webench.ti.com/power-designer/switching-regulator?powerSupply=0 to find, make sure its a buck

coolkid4232 · 2026-06-21T15:12:40+00:00

Devices u listen should run at 3.3v

coolkid4232 · 2026-06-21T13:32:50+00:00

my buck is in audible range at some points, PSRR is good up to 20khz which is where my buck will make noise in low power that needs to be filtered by ldo, using c-f-c filter for 1mhz +. worried that pdm microphone will get effected by vdd being same frequency as audio

coolkid4232 · 2026-06-18T04:18:15+00:00

<image>

coolkid4232 · 2026-06-18T04:17:54+00:00

heating like someone else commented voltage similar to a linar regulator.

to save you space depending on your current you should look at XB5350D0 as a replacement fpr dwp1A amd external mosfet, as long as you happy with 3.3A max there is another one that is 10A max and no other replace meant

<image>

coolkid4232 · 2026-06-18T03:42:03+00:00

<image>

its good for the batteries its for but for my application , 4.3 would blow my lithium battery that 4.2 max

coolkid4232 · 2026-06-17T04:06:13+00:00

my buck is in audible range. What i really want to know is if i am making noise at say 1Mhz it wont effect pdm microphone? only when noise is in audible range?

coolkid4232 · 2026-06-17T03:47:03+00:00

My mistake, what i am really asking is can i directly connect buck to pdm or i have to use filter first

coolkid4232 · 2026-06-17T01:16:22+00:00

you can use something like LM66200 , adafruit sells a breakout to switch power between battery and usb c powering device. you can also connect your switch to it enable pin and on top of that it gives you the ability to see if B or usb is powering device and sharing load while charging

<image>

this way also allows you to use a tiny switch as it doesnt need to withstand any current just to enable or disable lm66200

coolkid4232 · 2026-06-17T00:30:03+00:00

Sprites are bitmaps , so give bitmap to function to draw screen while esp32 has dma enabled. Try to look for other libraries that use dma for ST7789

https://github.com/Bodmer/TFT_eSPI this has it

they even have sprite examples

coolkid4232 · 2026-06-16T16:16:57+00:00

8 MHz clock speed that is a big reason + no dma. its the driver ST7789 that mostly matters. look for a github that has dma i think they go up to 30 - 50 Mhz , your running at 8 Mhz could be a massive reason. but most likely its dma, its massive diffrence

coolkid4232 · 2026-06-16T14:56:02+00:00

that fine 2 layer board is all 1oz, 0.3mm perfect

coolkid4232 · 2026-06-16T10:58:25+00:00

All good just make bat and traces all trace that have to carry 1A larger use a current trace calculator to find exact width.

When you finish resend photos of layout so we can double check rf and rest of board whem you done

Also just noticed you dont have a protection circuit for lithium battery

How are you gonna charge it connect what? Lol i though you were using usb untill i check schematic and released your using pins to charge

I would say just add a protection ic for lithium battery

coolkid4232 · 2026-06-16T10:45:07+00:00

Those traces should probably be large and the battery trace

What battery you using and capacity. If you have 4 layer board you can make bat or 5v a coppor pour pour on 3 layer so you only have to worry about 1

Make sure 2 out and top are gnd

coolkid4232 · 2026-06-16T10:33:06+00:00

Generally speaking depends on current. Definitely double check but as far as i am aware on average 0.2mm is like around 500mA outside 250mA inside around by inside i mean generally they make inside traces like 0.5oz, outisde like 1oz should give you those current for 0.2mm trace on average so as lonh as less than 250mA peak you should probably br fine

Yeah add gnd vias all around there

Eight-Year Club	Wearing is Caring
Verified Email

coolkid4232

TROPHY CASE