Category: Learn

Unexpected snow, hike abandoned

I was met with icy blasts as I got off the bus at the trailhead bus stop, and after only a few hundred yards, I abandoned the ascent. Though a comfortable climb I’ve done three times before, today was not the day. There was no snow atop Mt. Yufu this morning, but this afternoon was a different story, as seen in this photo from Yufuin’s main drag.

Desert plants: a puncturing hazard

A thorn, presumably from a desert plant clipping lying on the road, punctured my inner tube. I found the tiny hole in the tire, but I’d forgotten to include tire levers in the kit I’d brought from home. So, I walked the bike over to a bike shop. I left with a new tube (installed) and these very red tire levers.

Oops, closed Wednesdays

Cycled down to Moorten Botanical Garden. Of course, Wednesday is the one day of the week it’s closed. Continued our bike ride, then got haircuts and did the weekly laundry.

Stalled by joint play in a LEGO mechanical computer

All logic functions can be constructed using AND and NOT logic gates. Modern smartphones contain billions of logic gates. However, the LEGO machine I constructed today only has four AND and four NOT gates to perform binary addition on two single-bit binary numbers. As the signal propagates from the inputs on the left to the outputs on the right, the cumulative effect of joint play leads to unreliable output movements. I need to redesign the machine.

Bugs, Bills, and Beer

Over a welcome beer at our local, Dwight described his time at the greenhouse battling pests and mold on these grapevines. Meanwhile, I’d been caught in a Catch-22, ping-ponging between a vendor and Amex over fraudulent charges. Eventually, Amex took responsibility and issued a refund, leaving me free to enjoy my beer.

Categorized as Fails

Practical Physics

Downtown had its head in the clouds, it rained pretty much all day: time for LEGO. Instead of relying solely on a solid state gyroscope, I wanted to develop a better intuitive grasp of the physics involved. So, I built a test rig with an actual spinning flywheel. It flew apart, leaving my electronic robot…… Continue reading Practical Physics

ELL Training

Completed an online ELL (English Language Learning) training course this afternoon as part of the annual training requirements set by the Minnesota Department of Education.