The Circuit: Designing for Low Power, Clean Logic, and Physical Constraints In Part 1, I explained why I tore out the original “transistor-and-hope” lighting circuit from my Book Nook kit.In Part 2, I went through the firmware architecture around watchdog…
This is Part 2 of the BookNook Light Timer Series. Last time I introduced my BookNook Light Timer project and walked through how I planned to complete it using an ATtiny85 microcontroller. In this post, I wanted to unpack the…
A few months ago I got this cool miniature bookstore diorama “puzzle” from Amazon. It’s charming. Laser-cut wood, tiny bookshelves, warm white LED lighting — the kind of cozy miniature bookstore scene that slides between books on a shelf and…
I have this little SLA battery that enables my emergency generator to start without using the pull cord. I don’t have a maintainer on this batter (and maybe I should), so every once in a while I like to charge…
About a year ago I make a bunch of loaves and fishes for a Godly Play story at the church. I made them out of 3mm door hanger plywood that I picked up at the local craft store using a…
Apparently this new version is a lot better at math, so I tested it out with some simple calculations. Here’s how that went: This is pretty straightforward. A 3.65″ diameter is a circumference of about 11.5″, and that distance 1,750…
We got these blinds a couple of years ago from Amazon, and recently one of the string take-up mechanisms jammed because the string apparently came off the pulley wheel and wrapped around the shaft. I contacted customer service about how…
I got the Viofo A129 Duo a couple years ago because I seem to keep getting cut off in my little Mazda MX-5 Miata ND (2016+). It’s a ragtop convertible with only one obvious place to mount a rear-facing camera,…
Here’s how I start with a screenshot (bitmap) of a vector image and prepare it for laser cutting. Usually for cutting I need one path around the outside of the image (for the cut path), and then other paths that…
I got a bunch of $1 ESP-12F’s with the venerable ESP8266 for some projects and although there are some other posts out there that try to describe which pins to use for what purposes, I couldn’t find one detailed enough…