wmoser · HackerTrans

2 years agodiscuss

You would think so. I was working on an oil rig and they made a big deal about ‘management by walking about.’ So the heads of each of the departments were supposed to go and check ONE job their charges were working on that day. They were supposed to write a short report about what they observed. This was too much for them so they quickly got in trouble from shore-based management for not filling out their reports. So they promptly delegated to the next-in-line management They promptly delegated it to the people doing the work so once a week besides all the other paper work I had to fill out a report about how I was observing myself working safety while management still had no clue what was happening.

wmoser

2 years agodiscuss

There is a book, “how to ace calculus, the streetwise guide” that sounds a little gimmicky but is actually a bit entertaining to read. Looks like it can be had on thrift books or eBay for about $5. It helped me understand some of the concepts at a deeper level than math text books. The problem with math text books are they’re mostly written by mathematicians who seem to think different than the rest of us, so when they try to explain things it’s in a mathematician way.

wmoser

2 years agodiscuss

From working on controls on ships. Measuring the current using a CT (current transformer) or Rogowski coil to measure the current is a fairly standard way to monitor if something actually turned on when you told it to. A coil is a fairly robust device (no moving parts) so fairly reliable although sometime the connections become loose or the small wires susceptible to vibrations and breaking depending on the application. If you choose to use a CT make sure to never have a live conductor in it without it being connected to a rated measurement device reading. Since it’s a transformer, as current goes to zero, voltage goes to infinity which is generally a large value before it gets to be exciting. There are also devices called wire break detectors that are wired in series (I think they’re a type of galvanic isolator) that can be used to monitor if there’s a break in the wire but some of the cheaper ones are not as robust and have had them fail. Physical movement there are a lot of limit switches. Rotary encoders and rheostats are another way to monitor rotation of an object. I’ve even seen a rheostat used as a switch in a safety critical system before when they didn’t want to risk an open circuit, so just measuring resistance above or below a certain threshold was on or off. Smart camera systems with computer vision are becoming more main stream. Industrial sensors are often 4..20mA. Below 4 mA you might have a break or noise. If your reading is above 20mA you might have a short or noise. Slightly above or below might be a calibration issue.

Your acceptable rate and mode of failure will dictate what kind and how many layers of monitoring you need.

Depending on your use case you might be able to set up a camera and computer running openCV to watch the led and see if it comes on.

wmoser

3 years agodiscuss

As someone that works on a boat in the middle of the ocean, I welcome more accessibility. Being able to talk to my wife and kids while at work is so much better than being cut off. Also the better availability of weather information or technical information if there is a problem can literally be life saving. I also sometimes miss the days when I would go to work and literally have email every few weeks. Things were simpler then but I was young, single without any real responsibilities. Unfortunately time has moved on and even checking my bank account has become impossible without being able to receive 2FA messages. [There was a period of time where I could get enough service to load the app/web site but they insisted on a text l or email which was loading so slowly it would take more than half an hour that the 2FA was good for.] During COVID I had a coworker from Mississippi whose wife had to drive to the school to get photo copies of school work because they didn’t even have internet at their house with cell phones. Modern government and society has made internet connection mandatory to participate. Some people don’t have a choice of being somewhere remote.

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