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czardestructo czardestructo @lemmy.world

Reddit refuge, escentric engineer and serial hobbyist.

Posts 12
Comments 209
The hunt for the most efficient heat pump in the world
  • Their point is use a small generator to power the gas heater where as a heat pump is 'impossible'.I mention a whole house battery is in my 5 year plan to which they laugh and say your house will burn down. I don't have the patience. I told them I'm an electrical engineer specialized in battery systems and to let me worry about the lithium fires. That shut him up fast.

  • The hunt for the most efficient heat pump in the world
  • I live in a progressive state in the US and currently renovating a house. Holy crap they all fight me tooth and nail telling me what a horrible idea they are. Nothing but problems, always break, oh my goodness what if the power goes out, the grid cannot handle the load so don't do it. These old timers need to go away.

  • My Homelab addiction took a turn for the worse today when I finally figured out how to do 802.11q on my switch.
  • I have so much trash on my network. For instance my security cameras are decentralized and we use tinycam on android to view them so I had to allow an exception for rtsp to get between the dirty iot WiFi and our normal WiFi. Our WiFi connected Bose speakers and Spotify is also another set of annoyance, they will only work if you try to connect to them from the same subnet via Spotify and app. I've tried to NAT the traffic and it didn't work.

  • Harder than it seems
  • I feel attacked

  • My Homelab addiction took a turn for the worse today when I finally figured out how to do 802.11q on my switch.
  • It's going to haunt you for years. Wife: "why doesn't this iot thing work?" Oh its on the wrong network. "I don't understand it just doesn't work". Then I go add more exceptions in pfsense and the cycle continues.

  • My disdain for mega banks knowns no end
  • Or small regional banks! They called me once when I wrote a huge check for a contractor but forgot to move the money, nice lady at the bank said I had enough money it just wasn't in the right account and the check is going to bounce, she inquired if I wanted to move the funds so the check would clear. Yes please! Closed all my other bank accounts with other banks and never looked back.

  • China is attempting to mirror the entire GitHub over to their own servers, users report
  • I didn't down vote you. I'm not saying all Chinese engineers are bad, I'm just saying a lot are bad or don't care enough about details just execution as fast and with as little effort as possible.

  • Recommendation for a high-quality webcam for Linux
  • I have a c920 and it's complete poop. Random hiccups and stutter and the auto focus fails.

  • Gateway 2000 Computer - Brand New - Free to a good home!
  • Found a taker, hopefully it goes to it's forever home on Saturday!

  • Gateway 2000 Computer - Brand New - Free to a good home!
  • I got my first Gateway 2k Pentium pro in 1996 and upgraded from an Amiga 500 too! Wish I kept that computer but I did keep the CPU as a keepsake.

  • Gateway 2000 Computer - Brand New - Free to a good home!
  • Want to come get it? There is no market for this stuff and I'm on a time crunch. I need this stuff out fast. There are a bunch of speakers and decks.

  • Gateway 2000 Computer - Brand New - Free to a good home!

    So I'm cleaning out a house and found a brand new Gateway2k Pentium 4 computer. Someone opened the boxes but never took the computer out, its all still in the plastic and I don't want to ruin the unboxing for someone that is into this. The computer is free to a good home in the Boston metro area to make your retro gaming dreams come true! Shoot me a message, first come, first served.

    P4 Computer - Gateway 2000 model 510 - part number 2800434

    17" TFT Monitor - Gateway FPD1730

    Speakers - Boston Acoustics BA745

    Edit: Found a taker, hopefully it goes to it's forever home on Saturday!

    Edit edit: its gone!

    23
    “Th*s stuff’s made in New York City?!!”
  • I certainly remember seeing the second one on TV a lot when I was a kid.

  • [Weekly discussion thread] Parents, how are you doing? Any experience or tips to share?
  • Took a 6 day vacation with the wife and our only child, a five year old. Long story short, we learned vacationing with an only child is a lot of work and next time to bring her a friend or cousins to occupy her attention so that responsibility isn't on a parent. Still learning how to vacation!

  • Fck it, we ball
  • Bought one, thank you!

  • 1990 - 2005 Gaming Build
  • Carmageddon! I still have the original CD from the late 90s.

  • Billion-Dollar Thunderstorms in Florida? Thanks, Climate Change | Global warming is turning previously mundane weather events into potential catastrophes, and human behavior isn’t helping.
  • My wealthy relatives bought a summer home last year on the Florida west coast. That hurricane rolled through and messed up their entire neighborhood and they bragged if the tide went up one more foot their new home would have been flooded. I asked if they had second thoughts to which they quickly responded oh no, hurricanes never hit the west coast this is a freak event it will never happen again! The cognitive dissidence is insane.

  • Man who survived ebike fire that killed his family fights for change to UK law
  • It would be a lot cheaper to stop allowing no brand cheap crap with no accountability to be drop shipped from China. There are clear and well defined safety standards for lithium batteries and they're just being ignored. They won't prevent 100% of failures but 99.9% if they're followed.

  • New dishwasher video drop
  • My whole kitchen is Samsung. Stove needed a new bimetal switch because the cooling fan for the top got stuck on. The dish washer garbage disposal knife blew apart into fragments twice and the gaskets rotted and fell apart. Microwave magneto diode blew. Its all literal garbage, I'm selling my house soon and leaving that trash behind and buying high end next time to save myself money in the long term.

  • 150 Seedlings - into the cold frame

    Started the peppers in March and tomatoes in April. They were getting too big for my grow light so I evicted them outside. Plenty warm in the cold frame in Massachusetts. !

    2

    Android Microphone Snooping

    So I had a verbal conversation with a coworker yesterday and now I'm getting fed very specific ads. No possible way it's accidental. I have most of the microphone access to apps limited, I have Google assistant turned off and no VPA setup in my home. I use a Oneplus 9 pro, does anyone have recommendations on how to further root cause this or just par for the course for using any standard android OS? Have other folks had similar experience after locking down their stock phones?

    77

    Pi Powered Cuckoo Clock

    Action Video

    For her birthday my daughter received a cuckoo clock. It had very limited programming for 'quiet hours' so I fiddled with it and ended up breaking it. I didn't want to disappoint her so I gutted it and proceeded to install a Pi Zero W and a headphone amplifier I had built. She now has a fully programmable, USB powered, linux based cuckoo clock where I can program it to whatever suites our needs and it syncs it's time with NTP severs. I even connected her night light to it which turns on at night and off to let her know when its time to get out of bed. This combination also allows us to have dance parties with flashing lights, a dancing bird and fun songs coming out of her cuckoo clock. It's ridiculous and eccentric but it makes us happy!

    Build

    • The Pi Zero's dont come with a sound output so I built an audio output filter to convert the PWM output to an analog audio output
    • Connected the analog out to a OPA1642 based headphone amplifier I designed and built
    • Wired up the cuckoo bird's coil actuator to a simple MOSFET drive circuit to control it from the Pi's weak GPIO output
    • Wired up some 5V string lights (used to be battery powered) to a simple MOSFET driver circuit to control it from the Pi's 3.3V GPIO output
    • Wrote some bash code to make the bird dance, the light flash and the cuckoo bird sounds play
    • All the scheduling and execution of the code is done clean and simple in crontab
    • I also have a text to speech engine verbally state the hour after the cuckoo action so my daughter can better learn to tell time by herself

    To re-map the audio to the PWM0 output of the Pi

    add to /boot/config.txt to remap the audio to the PWM0 and PWM1 pins of the pi.

    ```

    Enable audio (loads snd_bcm2835)

    dtparam=audio=on #remaps the audio to the PWM0 and PWM1 pins (pins 18 and 13) dtoverlay=audremap,pins_18_19 ```

    Code

    Cron Scheduling

    ``` @reboot /home/pi/startup.sh

    #cuckoo between 8am and 6pm, inclusive 0 8-18 * * * /home/pi/cuckoo.sh

    #turn on the night light at 6:15 pm 15 18 * * * echo "1" > /sys/class/gpio/gpio26/value #turn off the night light at 6:15 am 15 6 * * * echo "0" > /sys/class/gpio/gpio26/value ```

    Startup Configuration for GPIO

    ```bash #!/bin/bash

    #setup the GPIO #"In order to use a GPIO pin through sysfs, we first have to “export” each one to make the appropriate paths available." echo "17" > /sys/class/gpio/export echo "26" > /sys/class/gpio/export #set direction echo "out" > /sys/class/gpio/gpio17/direction #cuckoo movement echo "out" > /sys/class/gpio/gpio26/direction #nightlight ```

    Flashing Light Code

    ```bash #!/bin/bash

    i=1

    while [ "$i" -le 3 ]; do #turning the GPIO on echo "1" > /sys/class/gpio/gpio26/value sleep 0.050 echo "0" > /sys/class/gpio/gpio26/value sleep 0.050 i=$((i + 1)) done ```

    Cuckoo Code

    ```bash #!/bin/bash i=1 echo "Looping "$(date +%I)" times"

    while [ "$i" -le "$(date +%I)" ]; do aplay /home/pi/cuckoo.wav & #flash the lights three times quickly /home/pi/flash.sh & #turn on the cuckoo bird coil to make it bob down and flaps its wings echo "1" > /sys/class/gpio/gpio17/value sleep 0.300 #turn off the cuckoo bird coil so it sits back down echo "0" > /sys/class/gpio/gpio17/value sleep 0.700 i=$((i + 1)) done #Text to speech engine, speaks the current hour through the speaker #date + sed command below returns the hour, in 12 format, and the sed command removes the leading zeros espeak -v mb-en1 -s 120 "it is $(date +%I | sed 's/^0*//') oh clock" ```

    1

    Raspberry pi 4 inside abandoned scooters

    www.tomshardware.com Raspberry Pis Found in Abandoned Spin Scooters in Seattle

    Where was this knowledge when the Pi supply was low?

    Raspberry Pis Found in Abandoned Spin Scooters in Seattle

    Title says most of it. Spin electric scooters exited the Seattle market and abandoned their scooters all over the city and apparently they have a pi 4 in them!

    104
    homelab @lemmy.ml czardestructo @lemmy.world

    Activate Turbo Mode

    Does anyone else have a Turbo Button™ on their router? My wifi router is in essentially attic space with no AC so it gets hot and acts up with connectivity issues. My turbo mode solves the problem.

    2

    Driving is more expensive than you think

    news.harvard.edu Massachusetts’ car economy costs $64 billion, study finds

    Harvard study says Massachusetts car economy costs $64 billion, and more than half of that comes from public.

    "The paper, which the students wrote as part of an applied lab course, found that costs are diffused across a number of areas and involve things people don’t often consider. Beyond those for individual drivers, road maintenance, snow removal, and policing, there are less-obvious ones, such as those associated with added pollution, value of land set aside for parking lots, lost productivity from sitting in traffic, and various costs associated with injuries and deaths on the road.

    Using publicly available data, the authors put the annual public tab at $35.7 billion, which amounts to about $14,000 for every household in the state. Those that do own vehicles pony up an additional $12,000 on average in direct costs."

    1

    Coffee Plant Seedlings - Kauaʻi Coffee Company, Hawaii (2016)

    Found some tiny coffee plants while in Hawaii and thought they looked amusingly fake so I grabbed a picture.

    4

    Hibiscus Flower - Hawaii (2016)

    Took a nice macro shot of a flower while vacationing in Hawaii awhile back.

    0

    Ghost Pi - an unconventional backup solution

    I call this nonsense host ‘Ghost’, for me it’s similar to a tape backup solution. Fairly simple concept, it’s an old Pi1 + external mechanical drive that sits dormant with its ethernet off. Once a month, at a random time and random date it enables the ethernet, spins up the drive and pulls data from the main server to update its drive then goes black until next month. The only way to check or maintain the pi is a push button that toggles the ethernet interface. I slapped it together with some scrap wood, spare hardware and screwed it to a 2x4 in a dark corner of my basement. It’s my 5th string backup, the ultimate insurance policy because I’m mental.

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