I built a padel tennis score tracker. It keeps the time, set and game scores, and tracks who serves.

- E-ink
- Physical buttons
- Coin cell that lasts for up to 3 years

I’ve been splice soldering for years but this is my very first attempt at PCB soldering. Everything works as it should so that’s good.

Hey ya!
Soooo i made this digicam using an esp32cam, ov5640 5mp cam module, and it has a 1.3" tft display that shows live view.

the cam is fully open sourced, you can find it on my github. (hey be sure to leave a star if you can!)
so y'all can build it yourselves, although you will have to do some soldering.

github: https://github.com/Bogey1309/PocketCam-Classique

i havent put it in a case yet- i do have the cad for it however, if any of you want to make it, you can put it in the case too.

unfortunately it does not take videos. but the photos look really y2k in my opinion.
(see the last 5th and 6th images)

also; i do not earn anything from this- just clarifying. its fully open sourced and i wanted to share this with y'all. (credits to hack club for supporting this project)

I made a Power supply board to get more experience with ecad.

It connects directly to 230VAC main via the plug on the bottom left. The plugs on the right output 48/24/12/5/3.3/1.6V DC with a small webinterface via ESP32-S2 for switching and checking voltage and current.

PCB & schematic files are avalable here (Altium files): https://github.com/Timo-Hauser/POWERPANEL-HW

I will use the PCB in my Mini Rack with my Raspberry Pi inside.

I cheated a bit by stepping down the ac with a LRS-150-24 module so its DC-DC only.

I would love to get some feedback on the Schematics as well as the PCB layout.

I choose the parts mainly based on availability at JLCPCB and tried to avoid any tht parts.

I'm aware I could buy this premade for cheaper but it was fun so far.

Rail	Source	Rated
24 V	Mean Well LRS-150-24 brick, through a TPS16630 eFuse	2.5 A
48 V	LM5156H boost from the 24 V bus	1 A
12 V	LMR51450 buck	3 A
12 V fan	LMR51450 buck, feeds 4 × 4-pin PWM fan headers	3 A
5 V	LMR51450 buck, TPS2557 current-limited terminal switch	3 A
3V3	LMR51450 buck	2 A
1V6	buck from 5 V	1 A

Also for those that care I did work with AI on the project.

So I made this 3S Balance charger that uses three TP4056 modules and three 230VAC to 5V DC modules so that they can work together and charge eatch string of cells individually, this makes it so that every time you charge your battery you make sure that it will be balanced once fully charged and no cells can stop charging before they are fully charged like with a normal chargers. And the best part is this is scaleable to how many strings you want even a 100s1p pack. Every module have to have an personal galvanically isolated power source so if you don't have 5V power supplies you can use three phone adapters instead using the usb port. It's very important that the power supplies are isolated from eatch other, you can't use one power source for all three modules. I don't remember exactly why but if i am not mistaken the GND is chared by the input and output making it impossible to series connect the output if you parallel the input making a shortcurcuit.

I just made my first handmade PCB. I drilled and cut the lanes my self. There is no short circuit and its little bit messy. If you have any advice maybe how i can do it beter i will take it.

I know i could make it with those fluid chemicals or whatever but my parents don't trust me with it.

Its a 5-35 to 5 V Circuit with a LED that indicates when the 5V pin gives out power.

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For most of my questions and debugs I used opus 5.5, I learned a lot from this project and can't wait to do more! It's been very fun :D

Spotwelded a 3s2p 40A Battery custom fit inside the old battery box that had completely different sort of battery cells than 18650, thats why I had to make the pack in a staircase type of way just to get the pack to fit inside the original batterybox, then I ran balance leads out from the box thru a connector that i can take apart so that I can unhook the charger that i made from the battery, the charger is a 3s balance charger that runs on 230VAC and always fully charges eatch string of cells so that the battery will never be unbalanced. Even at about 50% charge the drill has more power now than before with the new 40A pack. Cost me less than buying a new battery thats weaker and lasts a shorter time between charges than the one I made!

It smells exactly how you’d imagine

On a safety module.l took apart to take a look, i have no intention to put it back in production.

Dallas DS1225Y Battery 64K Nonvolatile SRAM X-Ray Images. They seem to have assembled this one with the battery on the bottom side. Hope this helps people be able to bodge in a battery and reuse these. It was hard to get the perfect angle.

I am running out of items to X-ray LOL.

Disassembled YIG microwave oscillator, a high-performance frequency source that uses a magnetically tuned yttrium iron garnet sphere to achieve exceptionally low phase noise and highly linear, wideband tuning across multi-octave microwave frequencies.

Photographed with macro lens and a camera, sample from our collection.

Hope you guys enjoy it! We couldn't find high-res images of the spheres online, so we decided to shoot them ourselves.

This is an LED blinkenlights type of thing, driven by 74HC14 Schmitt-trigger inverters driving the LEDs directly; and 74HC157 multiplexers to select different sequences.

It's my first time using such tiny components - the matrix area of the board needs to be clear of components but I needed to keep the rest of the board as small as possible while cramming in lots of capacitors and resistors.

I know some of you solder this stuff but I can't begin to imagine doing so so I left it to JLCPCB - OTOH I'm still an electronics novice so I'm impressed/amazed/astounded it worked!

Oh dear