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Profil korisnika/ce azonenberg
Andrew Zonenberg
Andrew Zonenberg
Andrew Zonenberg
@azonenberg

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Andrew Zonenberg

@azonenberg

Infosec, HW/SW RE, high speed digital, test equipment, network hardware, microscopy, FPGA/ASIC, @IOActive, KD2HKV, #SoOthersMayLive. Tweets are my own.

The lab
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Vrijeme pridruživanja: rujan 2013.

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    1. Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      Just in time for S4x20! (Yes, it's properly locked down - the only remote access is SSH with client certificate auth, on a dedicated SCADA network)

      1 reply 0 proslijeđenih tweetova 4 korisnika označavaju da im se sviđa
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    2. Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      Backstory: When I got home from Christmas holiday travels, I found the whole first floor of my house had flooded. It was dry, but obvious water marks told the story of terrible events in recent days.pic.twitter.com/3msjavG9sN

      0 proslijeđenih tweetova 3 korisnika označavaju da im se sviđa
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    3. Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      Luckily no significant damage as the water didn't get high enough to enter any of the computer cases, and everything else was on shelves/tables or otherwise high enough off the floor to escape. But I wasn't looking forward to it happening again, and I wanted to fix the problem.

      1 reply 0 proslijeđenih tweetova 2 korisnika označavaju da im se sviđa
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    4. Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      Looking at the leakage patterns, it became apparent that no water had entered from the east side of the house. The curtain drain was doing its job. Unfortunately, that area still got wet because water entering from the west had flowed down the hallway.

      1 reply 0 proslijeđenih tweetova 1 korisnik označava da mu se sviđa
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    5. Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      The water table in the entire property has always been high, and I planned to do drainage improvements outside in the near future, but it had not been a clear and present danger beforehand. This is my driveway last week. It's not even raining.pic.twitter.com/PLWix9WPvP

      1 reply 0 proslijeđenih tweetova 2 korisnika označavaju da im se sviđa
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    6. Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      I had previously RFQed for proper drainage upgrades, but the contractor was unable to do the work until the summer because significant excavations in saturated soil would collapse before any pipe could be laid. So it looked like I was on my own for the short term.pic.twitter.com/SCVFQbNa6m

      1 reply 0 proslijeđenih tweetova 1 korisnik označava da mu se sviđa
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    7. Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      I grabbed a shovel and began digging a trench from the sidewalk toward several particularly wet spots of the front yard, in hopes that pulling water away from the house would help. When I got near the end of the driveway, the trench started rapidly filling with water.pic.twitter.com/5vBxHP2Iic

      1 reply 0 proslijeđenih tweetova 1 korisnik označava da mu se sviđa
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    8. Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      As I dug closer to the source, the water was coming so hard that it was actually squirting an inch or two in the air from the bottom of the excavation!

      1 reply 0 proslijeđenih tweetova 2 korisnika označavaju da im se sviđa
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    9. Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      After the initial rush settled down I dug a bit deeper and found the cause: a shoddily installed ABS gutter downspot that was slipped over the end of a PVC pipe with no attempt at a seal. The ABS was cracked and the PVC was almost certainly clogged, so it all needs to be redone.pic.twitter.com/McwVZuGB9R

      1 reply 0 proslijeđenih tweetova 2 korisnika označavaju da im se sviđa
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    10. Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      Since the water coming off the roof couldn't get out to the sewer, it leaked out at this joint (a foot from the house), saturating the ground all along the exterior wall.

      1 reply 0 proslijeđenih tweetova 1 korisnik označava da mu se sviđa
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      Andrew Zonenberg‏ @azonenberg 20. sij
      • Prijavi Tweet

      After a bit more digging to direct sump pump runoff into the trench, it appeared that the immediate danger of flooding was gone. The next step was to improve monitoring and alerting so that if it came back, I'd be able to respond rapidly before too much flooding occurred.

      21:17 - 19. sij 2020.
      • 1 oznaka „sviđa mi se”
      • ralph waldo cybersyn
      1 reply 0 proslijeđenih tweetova 1 korisnik označava da mu se sviđa
        1. Novi razgovor
        2. Andrew Zonenberg‏ @azonenberg 20. sij
          • Prijavi Tweet

          The parts I ordered after the Christmas flooding incident had come in, so I set to work building a proper monitoring system. I started with a DIN rail mount kit for a Raspberry Pi, a couple of I/O boards, and a 4-20 mA submersible liquid level sensor. Here's the dev setup.pic.twitter.com/9ngVHzesr7

          0 proslijeđenih tweetova 5 korisnika označava da im se sviđa
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        3. Andrew Zonenberg‏ @azonenberg 20. sij
          • Prijavi Tweet

          Note the water on the floor in the bottom right corner of the previous pic. That's not spillage from the bucket I was testing the sensor on, that's an active leak into my lab. I also grabbed a Gentex horn/strobe and some water-sensing cables to place along walls in trouble spotspic.twitter.com/XvwvhWa5eU

          1 reply 0 proslijeđenih tweetova 2 korisnika označavaju da im se sviđa
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        4. Andrew Zonenberg‏ @azonenberg 20. sij
          • Prijavi Tweet

          The only remaining step was to code up a nice touchscreen HMI to crunch the data. It collects water level measurements at 1 Hz, does some averaging to reduce noise, then calculates tank volume and flow rate in L/hr.pic.twitter.com/QH79c5Ka8l

          1 reply 0 proslijeđenih tweetova 2 korisnika označavaju da im se sviđa
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        5. Andrew Zonenberg‏ @azonenberg 20. sij
          • Prijavi Tweet

          I plan to also track pump duty cycle over the long term (seconds on vs off over the past hour or something). Current/planned alarm conditions include water on the floor, tank level above the float, and flow rate approaching the pump's capacity.

          1 reply 0 proslijeđenih tweetova 3 korisnika označavaju da im se sviđa
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        6. Andrew Zonenberg‏ @azonenberg 20. sij
          • Prijavi Tweet

          Then the only remaining piece will be adding logging so I can collect trends over time and test effectiveness of outdoor drainage upgrades, and installing a 24V UPS so that I still get alarms even if the power goes out.

          1 reply 0 proslijeđenih tweetova 4 korisnika označavaju da im se sviđa
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