Where to find my latest publication

read more# Other articles

# Another little puzzle

A little puzzle involving nesteed circles

read more# A simple geometry puzzle

A little puzzle involving a circle with inscribed squares

read more# A Cubic Spline for Animation

Developing a simple linear program for animating an LED string

read more# A Problem in Optimal Transport

We show why convex cost functions lead to certain types of solutions to optimal transport problems, using a simple example.

read more# An intuitive proof of the Descartes circle theorem

An original, intuitive proof of the Descartes circle theorem.

read more# Return to Battleship

Reflecting on an old coding project, and what I would do differently now.

read more# Decoding a multiplexed LCD

Figuring out which segments are wired where on the TI-30Xa

read more# Lessons from the Xanthippe circuit board

Regrets and insights brought from the Xanthippe circuit board

read more# Revisiting Apollonian gaskets

A better way of generating Apollonian gaskets.

read more# Introducing Xanthippe

A formal introduction to my calculator validator

read more# A 3D-printed Planimeter For Use In Classrooms

A simple 3D-printable design for a planimeter, suitable for making a class set.

read more# Reading a Multiplexed LCD Signal

I want to read the signal going to the display of a TI-30Xa calculator. The display has 112 segments, multiplexed in a 4x28 configuration. How can we recover the displayed values from just those 32 pins?

read more# Reverse-Engineering a Matrix Keypad

The process of figuring out the layout of a keypad without looking at it directly.

read more# Reflections on wiring a calculator

Some thoughts on soldering, connectors, circuit repair, and test setups.

read more# Review: How to Do Nothing by Jenny Odell

I liked this book, it makes good points in interesting ways

read more# A Two Bit Analog-Digital Converter

A surprisingly simple circuit gives a reliable two bit analog-digital converter using only one integrated circuit chip.

read more# Measures of Bimodality

What are the most popular ways to measure the bimodality of a sample from a random variable?

read more# Pinball Science

an old game I enjoyed as a kid, which is now hard to install.

read more# What's Inside "The REAL Cotton Candy Maker"?

Tracing out the circuit of an old, constantly-breaking toy.

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