Day: idk anymore

took a month break from this project, got busy irl.
the 3 hours logged is me adding finishing touches, and getting a start on doing the firmware. But i decided i should ship before writing the firmware

Day 18: Power button

I might not actually need a plunger?
maybe just letting the power button stick onto the switch would work
made the switch blue for better visibility

Day 17: clueless so im messing around in cad

spent the day looking for resources or tutorials on how to make the actuator for the power button to no avail. is it really that niche?? so i just found the closest thing and used it as a reference. made a super dodgy concept of it but theres still many things i need to fix for it, like how am i even supposed to constrain it to one axis only??

Day 16: Added screw holes, port holes and stuff++

Spent a whole 8 hours on freecad adding screw mounts, adding the holes for usbc receptacle, 3.5mm jack, microsd card, and added an indent for the battery. Just missing the power button stuff. After that it should be the screen, and then fixing the length of the rotary encoder, as of now its wayy too long 💔

Day 16: switching out the connector for the display

switched the fpc connector to this one, and added a boost converter for the display

Day 15: reworking the pcb

moving the battery and stuff circuits to the bottom, to make space for the battery
should only have to change the fpc connector for the screen then the pcb should be almost done?

Day 14: hitting a wall 💔

kinda reaching a stagnant point, mostly just spending time considering about the layout and placements of each component to fit everything within the small size.
This is so not fun 💔 how do they fit all the components in such tight spaces. No solutions for now, thinking of the best compromise, either decrease battery size or increase the overall size and keep the capacity. Also the sockets and receptacles and stuff are so far away from the surface of the case, need to bring them out, maybe adding tabs.

Day 13: New design for jmp3, and fixed battery circuit errors

• redid the design, ditching popout screen and replaced it with a round screen, like the ones used in smartwatches, then using only 1 rotary encoder for the controls. maybe ill add volume buttons separately for ease of use. but for now itll be just one rotary encoder.
• fixed a few errors from my battery circuit
• sketched in paint, itll look better than this lol

Day 12: So the pop out screen is kinda unachievable

in freecad ive noticed that the pcb needs its own space, and so does the battery, then if i were to add the pop out screen it would need its own space too. its near impossible to cram all of that in “pocket size” and im just some normal guy so im not going to attempt it for now

i unfortunately have to switch designs, so far im looking into adding either a round display, and adding a matte glass or smoked acrylic on top

i also thought of doing like a flip out screen but it wouldnt really fit my design

im open to any suggestions design wise

Day 11: adding latching pin to the latching mechanism

• just some cad
  think i might have to resize everything 💔, sizes of the components arent what i expected, have to rearrange the components to have them fit into the size i want
  starting to doubt if pocket size is really achieveable 🥀
  the pop out screen will need some space, but the pcb is in the way

Day 10: Really really crude push-push mechanism for my screen

• with my very limited cad skills, i recreated the push push mechanism from sd card sockets (not final but it should be pretty much done
• i havent added the latching pin yet, still figuring that one out

Day 9: Swiiiiitchhedd to a better MCU

• Switching to esp32 s31 wroom 3, for better BT but this chip is too new theres barely any resources for this thing, im wiring it based on some sketchy datasheet i can barely understand
• sketched out somewhat the railing for the screen with my very very limited CAD skills, uhh next should be the spring and allat mechanism stuff
• barely got any sleep so not much work done today

Day 8: Rethinking components.. and researching push-push mechanisms

• someone reminded me of esp32 wroom 32 chips BT, and i worry BT4.2 may be lacking so im considering switching to esp32 s31 wroom 3 (might be overkill? idk)
• i also found out abt BT audio modules, err i think those arent necessary for this project so im gonna skip that actually
• spent the day basically studying sd card sockets push-push mechanisms, my pop out screen will probably be using this mechanism, just with a few tweaks to make it work, but mostly i think i got it down, just need to figure out how to CAD it with my limited skills..

Day 7: Somewhat done with the pcb

• should be pretty much it for the pcb, 4 layers, added an AMP cuz i forgot abt that, uh i couldnt find a right angle rotary encoder footprint so that there like that and changed volume buttons to a rotary encoder
• i really tried to keep the size within 60x90mm but the keepout zone is just so big i ended up resulting to 60x91mm, i really want the volume control knob on the right
  Anyways for the actual design itself, i want the screen to be a pop out one, as in it stays inside, then when you want the screen, press it, and it pops out.

Day 6: FInished up schematics, ready to start on pcb

• added so that the circuit can choose to be powered by usbc or battery, also added power button
• started planning out pcb, looking grim so far lol, how am i supposed to fit allat in such a small space?? maybe i shouldnt have used this mcu

Day5: Rough sketch of J-mp3

• Just a rough model of what the music player will look like, the indent on the bottom are for the buttons, i havent modelled them yet

Day 5: More more moremore work on the schematics

• properly connected the OLED (SPI), changed the AMS1117 to the RT9080-33, added battery voltage sensing, and wired up the switches

Day 4: Updated the schematics

• Still in the planning phase so i changed many things, havent really settled on how i should do the buttons yet, still looking into it. Decided to ditch the OLED module too, i’ll just use the OLED itself, connect it to the pcb with a socket. Arranged the schematics for easier viewing, adding an LDO for the battery to drop the voltage to 3.3V. Added the SRRT audio jack. Also made a rough sketch in freecad of how i want the design of it to be

Day 3: Planning out schematics for my music player

• For now I’ve added the components that I need in the music player, ie. audio DAC, SD socket, OLED display, and charging module. I haven’t decided which types of buttons i want to use yet, so I didn’t add them yet.
• I decided not to use any breakout boards for the modules to make everything slimmer and compact,
  also to challenge myself
  P.s. this is my second ever project, first one being keeb, of which i just completed. This one has proved to be a heck lot harder and I’m loving it(?)