Category Archives: Programming

Material related to computer programming.

Module Monday #3: KY-031 Knock Sensor Module | Learning Electronics In The Lab With Jay Jay

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This post is part of my video blog and you can find more information about this video.

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Silly Job Title: Connector Kingpin. I am the Connector Kingpin!

In this video we take a look at the Knock Sensor Module For Arduino 3Pin KY-031 Percussion Knocking Knock Sensor Module Diy Starter Kit KY031.

The demo code is here: 2025-10-20-KY-031-Knock-Sensor.ino.

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14500pa Cordless Hand Held VacuumThis is an image of the product.

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Taking information “out-of-band”

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Over in Intro to Data Oriented Design for Games, Nic Barker explains “taking information out-of-band”. Nic credits Andrew Kelly of Zig fame for introducing him to the idea (see Andrew Kelley Practical Data Oriented Design (DoD)).

The basic idea is that instead of having one list with items that have an enumeration with three different states, you can have three lists where membership implies the enum state, obviating the need to store the enum value in the item anymore, thus saving space and improving cache locality.