karmanyaahm

karmanyaahm

0-day streak
Chessbot motion system fully integrated and dragging pieces on Tuesday
Made a little matplotlib visualization for Chessbot's chessboard magnetometer areay
Neopixel header works!!!
MAJOR CHESSBOT UPDATE!!! We have movement!!
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Chessbot control board PCB Concept (trying to make it pi zero sized) This'll be a really tall stack tho
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Made a little bit of progress on chessbot's proto-control-board as a raspberry pi shield, you can power the pi directly from the screw terminal now, everything else is still disconnected though. If our whole control package ends up this size (hopefully even smaller) I will be fairly happy
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Learning NextJS API Routes for #onboard gerber.zip
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Received my hcb card and tbh this reeeealy does not seem safe
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Formulahacks today!! So excited 😄
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Rickrolled the library
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Assembled one chessboard segment (one row) yesterday
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Electrical engineering 🤓. Got one of the magnetometers for Chessbot reading data on Monday! Also, APPARENTLY WE (the ECE dept) HAVE A REFLOW OVEN LIKE A PROFESSIONAL KIND OMGOMGOMGOMGOMG THIS WAS MY REACTION I LITERALLY JUMPED WHEN I SAW IT. Next side quest is to get trained to use it
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I got a 1200 watt buck boost converter for formulahacks and #trident
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routing 😭
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it should be illegal to remap ctrl+f to something else (in this case flip layers) when find is actually a meaningful function here
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I learned how to send grants on HCB thanks to @sarthak
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LCSC order for Chessbot came in!!!!!!
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nice
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and also made it so tracespace fills gaps in easyeda exports by default without having to change any settings!!! (cc @parkalex380 cameo)
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Added a URL parameter to tracespace for default view (mode=layers)
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ripgrep is my fucking hero when working in a new large codebase
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I met a robot tour guide today at AHG (realizing I should have taken better pictures)
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Accidentally blew up TMC5160 stepper drivers by connecting them upside down 😭
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470M ohm resistors for a high voltage resistor divider
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Also did robotics auton testing from like 9pm yesterday to 2am today
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Scorekeeping a middle school vex robotics competition
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Ugh red tape
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oops i accidentally puushed directly to hackclub/onboard, testing our new review bot
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Got like 30 mins of sleep while doing hotel room robotics but very intense comp day yesterday
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Hotel room robotics
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This printer has printed more hours in the last 48 hours than since I got it
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Why did the printer cross the road?...to go to the vexu tournament in Houston
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Chessbot PCBs arrived today!!
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AAAAAAAA pre comp grind 🤖
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Robotics printing and programming
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tried to install linuxcnc on a pi 3b yesterday and today but can't figure out how to get a real time kernel working properly. The official images are only for a pi 4 and 5 (like whotf even has a 5 its so new) and it's a nightmare so I tried installing regular raspbian 3 times but I kept getting the wrong versions (12 64bit, 12 32bit, 10 w/ kernel 5.4) and it kept dying. My next move is to try the kstepper kernel module to just step without any of the fancy cnc logic.
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I have acquired the goods!
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I was playing around with this old ender 3 motherboard but couldn't get it to do stuff, but Jake got an Arduino mega with a shield running Marlin. Other than that I looked around for libraries for my tmag5273 magnetometer and tbh might just write my own because we need a very small subset of features, but while being very very efficient
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More Chessbot! Looking at how practical a physical magnet would be as the dragging piece if attached to a servo
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I captured the first waveform on my new oscilloscope!!! This is from my pocket PCB piano (prev. musical keyboard) speaker output. Effectively the output of a 555 timer!!! So exciting!!
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ITS ON Todo, see if I can actually get a signal
5cm
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3cm
Insanity
got scopes 👀
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Chessboard v2 is finished! This PCB sensor array is a single row that can be daisy chained, which makes things a lot cheaper. Going to get this ordered soon
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Cases printed!
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I got mad at Linux so doing a little hardware now. My first fully-from-scratch 3d model since I got my new printer, so pretty excited
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idek wtf is going on
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More VRC reffing
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Musical Keyboard v2 is here! Enjoy cheaper production, lighter weight, daisy chaining support, and some really cool (and other really gross) microscope shots!
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Spent like 4 hours debugging drivers, cuz apparently 2 of the drivers had some weird ground or capacitance issue where vref (for current limit) only worked when I had my finger (or multimeter probes :angry-dino: near it). So the motor didn't move unless I had my finger near the board. Ended up fixing it by switching to a 3rd driver which was apparently just fine?????
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chessbot ESP32-DevKitC-v4 clone w/ Pololu DRV8834 motor drivers. Goal was to find out how well it runs at 5v (as opposed to 12v) (so I can simplify circuitry by having only one voltage rail). Answer was sufficiently well. Should be able to cross the board round trip in ~8seconds (ignore the video numbers)
its coming together!!!!!!!!
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pure, unfettered insanity
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woah I learned how to use the place footprint in matrix kicad plugin today this is so cool and fast and easy ❤️
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worked on chessbot today
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I'm so smart, using vim in the VSCode terminal
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ti.com doesn't have "education" as an option
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maybe with text?
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bunch of stuff arrived! now looking for an adjustable psu to test these... (the university makerspace is closed till next week)
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Some feature/cost analysis for chessbot today
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LETS GOOOOO REAL CODING AFTER SO LONG I MADE A THING DO A THING. (an updating comment bot to help me review GH PRs) back to the basics, scripting to automate my work
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woah my schematic document is "advanced"
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I love Google
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Head reffed an (unofficial) VRC tournament today, quite an experience and definitely a very very interesting perspective on how hard it is
Did the Vex Robotics head ref exam, although can't officially be a head ref because I'm under 20, I'm reffing at an intra-district practice competition tmrw
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Did work work and restored my music server after my old server died
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Shipped Hot Dog and the Outernet Hot Dogumentary! youtu.be/oOEWn-E6v-w, one of my main #100-days goals
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Finally got video encoding working on kdenlive!!! Idk how, but I'm so excited to be able to edit fast + :leeks:
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I melted my favorite ruler running tests for #trident 😭
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working and studying today
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3 0603 capacitors on 1 pad, to test out tuning the touch sensor
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I finally got my #onboard keyboard under $50 (there's a $9 coupon) so it can be a jam!!! 🎹
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Printed a new case to make my TOTkey keychainable
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My 3d printer arrived!!!!!!!!!! Literally sooooo excited
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Guys ISTG I was going to sleep at a reasonable 11pm but now it's suddenly 1am and IDK what happened I have another fire hazard PCB on my hands. I assembled my COTS flyback generator board from Amazon more vlogs here: youtu.be/gE-u74lq6d8
I think I finished my scariest #100-days goal with these two ntfy PRs. Still need review and cleanup, but I'm so so so so excited! It was at the top of my TODO list for literal weeks cuz I tried different architectures and everything just seemed kinda sucky so I procrastinated, now I'm at a compromise that I can settle for. Hopefully binwiederhier likes it too
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Don't have interesting pictures because I probably shouldn't share proprietary designs but my first time extensively using Altium Designer for my internship at jcore.io which started yesterday
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Playing with my keyboard Onboard instead of studying discrete math. This is me and a friend who's very good at playing.
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My musical keyboard arrived! 🎹
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My musical keyboard arrived! 🎹
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My OnBoards are arriving soon!!!
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more android
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More vex robotics, running tournament manager this time
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scrapbook should not bug
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After finishing my research paper I can finally work on the ntfy bugfix again!
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android emoji
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Electronic Piano PCB ordered! Jam coming soon™. The gold/silver/circular pads are surfaces connected to capacitive touch sensors (they detect your finger by how it forms a capacitor with the circuit). I have different layers on those to experiment with which finish works best for touch detection in this design. But whenever each key detects touch, it allows the capacitor of the 555 timer (a frequency generator) to be charged at a rate determined by the variable resistor for that key (the potentiometers are at the top). Those potentiometers can be tuned to allow for different frequencies for each key. Then, the 555 timer outputs a signal into the speaker circuit, which you can then hear! What are your cool name ideas for this PCB? The best suggestion gets to be the jam title!
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slowly coming along - slower than expected, but should order early tmrw
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onboard emoji
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emailssssss
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This is a 555 timer driven speaker, and the RC on the 555 timer charges up at different rates (the Timer label) based on which 'key' is connected. The keys are the individual boxes, each of which has a capacitive touch sensor IC that connects its potentiometer to the 555 timer label, which then charges up the RC based on the potentiometer value (the speed of charging changes the frequency). Basically a capacitive keyboard.
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getting started with android development for the first time in well over a half dozen months (I don't think anyone says that, but it's funny)
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Not sure what to use for the scrapbook photo but MC'd a vex robotics tournament (message for scrapbook)
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Too much money but oh well hopefully I get that apple experience that everyone says bambu offers
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finally compiled a bambu studio for NixOS and got 3d printer trained
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Chessbot
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Don't have pictures of the whole thing but I got recruited onto chessbot ig, an electromagnet CNC drags the chess pieces around
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Emailsssssssss
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Visited the map room that has 3D maps. Sooooo many maps
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♥️usb
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This is what the picture sounds like
Did SSTV today
Dunno what picture to put but I checked into my first ham radio net today (N5OAK) along with others from N5XU
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!!!
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I listened to the weather station using my HackRF today
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Needs more inspection and sanding but the antenna looks intact
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That's a comedic feature not a bug
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Worked on THE BOX #time-capsule, need better name ideas for the time capsule than Treasury of Hackers' Exhibits Bridging Out-of-the-box eXperiences, need help with art
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Sponsor emails
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Laser cutter trained at TIW
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So, it has come to this
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Motor driver done
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Whoaaaaa @rivques put my name in the startup sequence of the TOTkey they sent me :ultrafastparrot: (their onboard project)
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Waterarms on campus 😳
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We're back!!!!
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MD Tables in Jams!!!
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$14.09 from university auctions, need ideas for what to do with those
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Taking apart a fan to try to backdrive LEDs from its rotation step 1
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(literally) got my hands dirty after a long time with a disassembled motor and a crappy electromagnet
Using ROS2's multi device communication to send Intel realsense camera data from a Jetson nano to my laptop
I was wondering why electrical systems have 3 sinusoidal phases and why generators are typically built with 3:4 coils:magnets. So, I graphed the magnetic field strength at various phases to find out: www.desmos.com/calculator/buqj2pdezs
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I invented a revolutionary new technology called SafeMag to make wireless charging better for free, AMA
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I made a thermostat circuit with hysteresis (i.e. dead zone, it'll keep cooling to a lower temperature, and only turn on when rising at a higher temp to prevent rapid cycling) and simulated it in KiCAD's ngspice!!! Using a 555 instead of just an JK Latch because the rest of my circuit uses it. Now let's see if I can replace the Comparators w/ 555s too.
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It's done!!!
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Gee, I wonder why my USB interface is not working
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The core concept works!
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Angle measurement and USB coming soon #onboard
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Manually recovering each file of my website since Jun '22 from my broken disk image is so fun. Ripgrep is 🔥 though.
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I like that Go Replace actually works unlike yarn link
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Finalizing my workshop and to procrastinate finalizing my workshop I'm making paper 1:1 (2D) mockups for my TOTP device
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Yeah these are easily the 4 hardest to route. Thankfully it's just RESET not a signal or power trace so it can be super thin and jump around a bunch.
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im sooooo close to finishing my #onboard project
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Trying to get an orange pi running
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cuz I obviously had to flip DIN and DOUT in kicad
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Ok I spent 5 hours last night trying to figure this out, but what worked was just sleeping. I woke up a Eureka moment regarding this power ORing design. So, I have a battery (say +3V min) and USB (+5V). I want to drive VDrive from the USB when it's connected, else the battery. img1 is what Unexpected Maker's feather s3 does. img2 is the most basic ORing design. img2 will mix the two inputs in the right way because the battery has a lower potential. The BATT Diode has one job: Protect the battery from charging directly through USB. Then, because the battery has a lower potential, the battery won't push current. i.e. when USB is plugged in and VDrive is 4V (assume diode voltage drop of 1V), because the Cathode of the diode is more positive than the Anode, VDrive is 4V & BATT is 3V. So, no current will flow from BATT to VDrive. When USB is unplugged, pretend that half of the circuit doesn't exist and BATT powers VDrive. However, Vdrive will be at 2V, because the diode drops some voltage from BATT. Now, why is img1 better? it seems more complicated. But, the trick is that instead of a fixed voltage drop, turning the MOSFET on causes the drop to be ~100 mOhms. At 1A, that is a .1V drop - significantly better than the diode - not only does it save energy, it allows you to use the battery down to a lower voltage. There are 3 states to this MOSFET arrangement: 1. VUSB is 5V, VBAT is 4V. G > S. Transistor does not conduct. Additionally, since S > D, no potential gets applied backwards onto the battery. 2. VUSB is 0V, VBAT (D) is 4V. G = S = 0. Now, since S < D, current can flow across the body diode. This brings S up to 3V. 3. Now - S = 3V, G = 0V, G < S and the MOSFET is enabled. 4. If VUSB is enabled again now, go back to step 1. None of this probably makes any sense but I should clean it up and write a blog post.
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me debugging yaml
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PCBing
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Day 99? of Winter Hardware Wonderland - Project Oreo Custom Rubber Ducky I left a parting gift for my CS teacher. Next year 1st pd CS will find this beauty.
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Soldering male connectors to the headers on an Arduino Nano (We have to get Mr. Robot done next week and don't have time to order proper jumpers 🙃)
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KiCad tutorial learning PCB Design
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Look Reese, train
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Dallas #vrc day 2 vex robotics competition
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Dallas #vrc Vex Robotics Competition
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Restoring Mr Robot with Vex Cortex and ROBOTC milestone (with @Jaxzog)! The master brain is now talking to the follower and successfully sending values over UART!
Visiting UT Austin!
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Installing headers to adapt the ports to a vex cortex brain for Mr. Robot (a Lego technic based humanoid)
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Ampli-Tie final day 5, March 25th - the day has arrived! - Solder the microcontroller (I'm just powering it off the mCu USB port, past me calculated a peak of 100mA would be reasonable, future me found out the whole thing only consumes 26mA). - Copy a whole bunch of code off Adafruit, but the mic doesn't work, turns out, for some reason, my painted mic is broken and always outputs 3.6v. Hurriedly swapped to another mic, unpainted, so it would have to hide under the collar (T-2hrs). - Still cannot get the mic to work (T-90m). Might as well get static effects working. Got timing on rainbow cycling adjustable from the app, and made sure static color worked. - (T-60m) it works! Now I actually gotta tie the tie and dress up.
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Ampli-Tie backlog pt 2! Day 4, Friday, March 24th. Skipped school and the pressure was on, I have to get something working before tomorrow. I also have UIL this evening and tomorrow morning so just have ~9 to 4. - painted microphone - sewing, sewing, and sewing - I made the hard decision of splitting it into two halves, one above the name tag, and one below because connecting them was a nightmare. So, I used a wire to connect them (I got this really nice stranded 24AWG silicone wire that is extremely flexible and blends in perfectly). OTOH, connecting the two halves using an actual wire created a "highway" that reduced the resistance (conductive thread) from the microcontroller to any individual LED).
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Ampli-Tie backlog! Day 3 (March 22) - sewing + acquired fray check to tie up loose ends Day 4 (March 23) - Hours and hours of sewing - After having to hold open these tight spaces gimme my surgery license already - first test, using alligator clips to connect the microcontroller and power 🎉
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Custom Ampli-Tie Day 2 - Step 2,3 1. Sizing and learning how to tie a tie 2. Placement tests (fewest lights that'll look decent) - 13 LEDs every 3 cm apart was optimal 3. Harvest Flora NeoPixels from an old non-functional project and then spend foreverrrrrr cleaning them (removing the superglued thread) 4. Ordered microphone and ribbon cable
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Custom Ampli-Tie Day 1 - Step 1 Power consumption testing of 16 Neopixels (and the start of my real life engineering notebook, thanks #vrc :/)
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#frc today, big robotics week
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:winter-hardware-wonderland: #hardware-party Day 12 building a custom USB rubber ducky: Edited a (draft) image and presented on the :winter-hardware-wonderland: 🚢 :emergency-meeting:
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:winter-hardware-wonderland: #hardware-party Day 12 building a custom USB rubber ducky: Edited a (draft) image and presented on the :winter-hardware-wonderland: 🚢 :emergency-meeting:
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:winter-hardware-wonderland: #hardware-party Day 11 building a custom USB rubber ducky: I shot the wallpaper image I will put on people's computers using my rubber ducky and assembled and soldered most of them. Huge thanks to @Jaxzog and my other friends who helped set up this set (it took like 4 hours) So close! I just need to finish my informational pamphlet, finalize the mac code, and edit the photo. (I'm in the epoch hoodie w/ the soldering iron (yes, that's a cage nut tool))
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:winter-hardware-wonderland: #hardware-party Day 10 building a custom USB rubber ducky: Finally, assembly and soldering 👏. The resin cases are nearly indistinguishable from molded plastic, I'm impressed. The good batches also fit like a(n expensive, high-quality) glove. We also set the set for the wallpaper photoshoot at school. Don't have a trench coat, but I'll do my best black hat imitation tomorrow. 🎩 Finalizing both tomorrow.
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:winter-hardware-wonderland: #hardware-party Day 9 pt 2 (lost count) building a custom USB rubber ducky: I don't know how Hak5 does their thing, but I got the full fingerprint from Windows and frequency charted the bRequest values, and there aren't more than 2 Configuration params (8 and 9). Maybe I was looking at the wrong value, or parsing it wrong, but I'll just stick with my old working method.
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:winter-hardware-wonderland: #hardware-party Day 9 building a custom USB rubber ducky: Trying longer fingerprints to copy HAK5's number of configuration descriptor-based detection, and I realized I'm dum dum The setup transaction wasn't just ~250 bytes, I was using a char-based counter, which must've been wrapping. Oh, C.
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:winter-hardware-wonderland: #hardware-party Day 8 building a custom USB rubber ducky: Not much material progress today, but me and @Jaxzog brainstormed ideas for the image to set the wallpaper to. I also got started w/ an instruction manual/explanation for if someone overreacts to being pranked.
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:winter-hardware-wonderland: #hardware-party Day 7 building a custom USB rubber ducky: @KaiZheng-U049N5Y0WM9 shipped my cases today ❤️!!! (Yes also the UPS people spelled my name wrong) I asked @reesericci for help testing the Mac version of my script at the Austin Central Library. They have computers that reset everything, including permissions, which helps test how the script will behave on new never-used-the-terimnal computers. Thanks reese! (Deleted and reposted for...reasons)
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:winter-hardware-wonderland: #hardware-party Day 6 building a custom USB rubber ducky: @KaiZheng-U049N5Y0WM9 printed some cases today!!!
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:winter-hardware-wonderland: #hardware-party Day 5 building a custom USB rubber ducky: Open Sourced all the code I worked on yesterday on GitHub: rubber_ducky, circuitpython, and tinyusb. Next step is to make it upstream-able. Also sped up the Windows Powershell payload with @Jaxzog, and made it hide in the background. If anyone has any ideas on how to make this shorter/faster, I'd love to hear it (powershell experts :pleading:)! github.com/karmanyaahm/rubber_ducky/issues/1#issuecomment-1435768480
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Day 4 of Winter Hardware Wonderland :winter-hardware-wonderland: , #hardware-party building Project Oreo, a custom USB rubber ducky: Core software finally integrated!!!!! (unoptimized tho)
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Day 4 of Winter Hardware Wonderland :winter-hardware-wonderland:, #hardware-party building Project Oreo, a custom USB rubber ducky: the 3d printed case prototype. Just need a couple of minor changes before finalization
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Day 4 of Winter Hardware Wonderland :winter-hardware-wonderland: #hardware-party, building Project Oreo, a custom USB rubber ducky: I fixed the pointer const issue by literally just adding a (void*) and now I'm getting fingerprints!!!!! (I need to change uint16 to uint8 but I'm very excited) Woo!!!!!
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Day 3 of Winter Hardware Wonderland :winter-hardware-wonderland:, building Project Oreo, a custom USB rubber ducky: I got some sick renders of the case (Inventor Ray Tracing). Hopefully the prototype print tomorrow is successful, then I can send it to @KaiZheng-U049N5Y0WM9 🤞 On the software side, I have the core code (capture the first 10 setup packets and make a python function to receive them). It just doesn't work 😦. TODO Debug
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Day 2 of Winter Wonderland #hardware-party :winter-hardware-wonderland:, building Project Oreo, a custom rubber ducky. On the software side, I got CircuitPython building in a Pure Nix Shell. Turns out, some Python libraries are built using flint instead of setup.py. Thankfully, there's a mode in Nix to handle that. I can now modify the code that ships with a UF2 by default, making deployment just a one-file-copy (very important when you have 20 of something). Next steps: Look at Micropython manifests to figure out how to include data/image files in the UF2. Track the received setup packets (host fingerprint), and make a function to transmit those to Python from C. On the Hardware side, my friend designed and 3d printed the first prototype of the case at school. It doesn't quite fit (see USB Port area), so needs a second prototype.
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My school got 5 4331s and 10 9200L-24t-4G-Es from Cisco and I'm in charge of setting up the first one :partyparrot: with no Cisco experience whatsoever (except teacher's help who is CCNA)
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Day 1 of Winter Hardware Wonderland :winter-hardware-wonderland: : 1. Collected even more USB Setup phase fingerprints with my old Digispark-based device. Now I just need two types of teachers' HP Laptops and M1 Macs. 2. Building Circuitpython is haaaaaaard. The crazy dependency management is the primary reason I hate embedded things. Maybe I should Nix this... 3. @KaiZheng-U049N5Y0WM9 agreed to 3d print my cases and ship them to me ❤️. I need to hurry up on finalizing the design so they get here on time. Making a better open-source USB Rubber Ducky with OS Detection www.youtube.com/watch?v=FbiJCnHBr70&list=PLxlDG2SH_6rvZrNAuVXI0BIdv7MWvkMNm
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Did someone say push notifications in the FOSS F-Droid version of Nextcloud? Edit to clarify: nr23730@github.com has been working on a version of Nextcloud that supports UnifiedPush. Originally, we thought it would need a gateway (a server that converts between push formats) to function. However, reading through the Nextcloud code, I realized that they don't have any URL normalization, they just append "/notification" to the provided URL (caused the need for a gateway in the first place). So, I realized, we could just add a "#" to the end of our push URL, like ntfy.sh/upABCDEFGH?up=1#, then, Nextcloud will send notifications to ntfy.sh/upABCDEFGH?up=1#/notification, which is effectively our original URL! (Stuff after # is ignored). One of the most useful (benign) injection attacks I've ever come up with. Boom! No gateway Nextcloud UnifiedPush: github.com/nr23730/nextcloud-android/pull/1/files
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my USB Rubber Ducky scripts can block mouse movement with a repeated mouse.move(x=-100,y=-100)
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Some reading... (slack is being stupid and not showing my image for some reason)
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Migrated k.malhotra.cc, my URL shortener and Golang vanity URL thing, from a dedicated CGI python service to a Jekyll collection and some IPFS redirects under my main website, one less thing to build and deploy.
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The first draft of redoing rate limiting for UnifiedPush in ntfy. This makes rate limits for UP topics count toward the receiver (phone) rather than the sender (large application server sending to a lot of people). This will remove the need for rate limit exception lists managed by hand. github.com/binwiederhier/ntfy/pull/584
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