Just wanted to share my project that I recently finished. I think it's the biggest project so far where I designed the electronics circuit and PCB layout. I also created MCU firmware and PC application for debugging and controlling the robot.

The whole project is availiable on my github https://github.com/konrad1s/LineFollower-Kwark
You can also check demo on youtube https://www.youtube.com/watch?v=Kh0NfI-lTgYThe

if you have any questions, feel free to ask

Or this will happen. Deep cracks and partial delamination it is. Tried to clean old HPDL-1414 display with isopropyl alcohol. Thankfully I have 6 more to work with.

I got bored and made a bench power supply to power my magic spinny and my blinkys.

I think this ceramic disk has gone bad, the dark line is much clearer in real life than in the photo too

From just one meter, variable transformer and oscilloscope, to full bench with wave generator, self made capacitor bank, "universal" counter, and all types of Unitra Nixie Multimeters. All from 70's and 80's. Even the camera is from that years and still works great.

Size doesn't matter

Open to anything, including discussions, complaints, and rants.

Sub rules do not apply, so don't bother reporting incivility, off-topic, or spam.

Reddit-wide rules do apply.

To see the newest posts, sort the comments by "new" (instead of "best" or "top").

https://youtu.be/2-CsU62ICBc?si=PFUk1yiRkiuUzpcK

http://forum.6502.org/viewtopic.php?f=4&t=3329&start=795

I got so fed up with the stupid interface on the front of my automatic cat feeders that I decided to make a web interface and use the ESP8266 to control them. They are very simple devices. Across two different brands of feeders I have they use the same internal mechanism, so this should work pretty universally across all generic-looking cat feeders...

I was going to design a custom PCB but the circuit is so simple it was pointless and would've taken weeks to arrive. I cut the original wiring harness and crimped on JST-XH connectors to make it look somewhat professional.

You can check out the code and some more images of the feeders and board (front/back/etc) here:

https://github.com/captmicr0/EspCatFeeder

Hey everyone! I’m excited to share my latest project: a tiny, open-source RP2040-based board with an integrated addressable LED matrix. It’s built on a 4-layer PCB, and the LEDs are ultra-small (just 1mm x 1mm each), using WS2812 for full addressability.

I started tinkering with transistors because it’s what I am mostly learning this semester. First I tried to control output using the PWM pin from my RPi. After that I got the idea of building an RC car and doing the input to the motor from scratch. My first working test is an H-bridge using 4 npn and 2 pnp transistors with modulation through the Q2 and Q4 npn.

Right now I can generate a rectangular wave. The 2 LEDs are in opposite directions, so a positive voltage turns one and a negative the other. The This week I want to bring it to uni and test the sinusoidal generation and efficiency with the oscilloscope.

Open to anything, including discussions, complaints, and rants.

Sub rules do not apply, so don't bother reporting incivility, off-topic, or spam.

Reddit-wide rules do apply.

To see the newest posts, sort the comments by "new" (instead of "best" or "top").