I haven’t been happy with the ultrasonic water level sensor on my rainwater tank, so I picked up this 0-10psi pressure sensor cheap and plan to plumb it into the outlet. Pressure in psi = height in feet / 2.31 (kPa = meters / 9.81)

I finally found the source of the leak in the water main at my parents' house. Who uses compression couplings underground?! Now I just have to figure out a temporary fix while we wait for the supply houses to get new stock

We’re not all ignoring the problems with capitalism, but I haven’t found enough comrades to help me liberate the means of electricity production

KR4DIO boosted

Learning that people suffering from the storm and blackout in Texas were using the guide in our book Recipes for Disaster to build a rocketstove with which to heat food and water, we've put the directions online here in their entirety:

cwc.im/rocketstove

Please circulate.

I think my octopi needs a case. Somehow the sd card got cracked just sitting there beside the printer

We splurged on a Dyson cordless vacuum cleaner a few years ago, but when the battery went dead, I couldn’t bring myself to pay $100 to replace it. Why not use a removable power tool battery instead?

This Ridgid 4Ah pack lasted 8 minutes on “max” mode — 33% longer than the original battery. It should be more than enough (30-40min) on “auto” mode, but with a removable battery I can swap in a fresh one and keep going without stopping to recharge.

KR4DIO boosted

New modules and old modules for the Heathkit AA32, front and back.

Guess which are old and which are new.

#HeathkitAA32Build

KR4DIO boosted

The final stage of my rainwater filter system is a UV disinfectant. The control module has an indicator for "lamp good" and "lamp bad," but the whole thing is in a shed outside. I plan to use an ESP32 or something to monitor and alert me in case of failure.

How should I detect a failure?

KR4DIO boosted

Boost if you've ever texted on a flip phone

Most superhero stories are problematic, but this page describing a dilapidated neighborhood as a place full of villains where no one follows the rules is some grade a bullshit gentrifier propaganda

KR4DIO boosted

hey - does anyone in berlin want a huge (prints on A2), old, amazing pen plotter? (image of it attached).

i got it when i lived there, and i've since moved and had huge hopes of trying to move it back to nyc but it's just not going to be possible. you can have it for free as long as you go and pick it up at my old flat, it's heavy as shit.

includes all needed cables and a lot of repair / maintenance / operation manuals that don't seem to have been digitized anywhere.

KR4DIO boosted

Note to C programmers: char doesn’t default to signed on all systems. Please be explicit in your type assignments. I just spent way too much time trying to figure out why an aprs wx utility that worked fine on my x86 systems failed on beaglebone and rpi.

The ISS equipment seems to be working great for this latest ARISS SSTV event, but I haven't been able to capture a good image yet.

KR4DIO boosted

Dear web developers and admins,
please stop embedding Google's hideous #ReCaptcha into your websites. Its algorithm is faulty, forcing regular users to click dozens or even hundreds of fire hydrants, bicycles, or traffic lights each day. It puts a 'suspicious activity' flag on users who won't obey to Google's business model - such as people who don't sign into Chrome, use anonymity VPNs, or use browser extensions to suppress common tracking mechanisms. Enough is enough. Stop it.

pandemic 

I finally got to tell someone off for not wearing a mask today

There’s nothing wrong with building electronics in Tupperware, but you really should consider using this as an excuse to get a 3D printer ;)

I *had* enough cutoff wheels to finish this project before three in a row exploded on me. Always wear eye protection!

I never should’ve let myself get suckered into using a “free” commercial product in the first place. Time to make sure I have local copies of everything in portable formats.

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