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Paul Otto

Discrete Fourier Transform and the Number Theoretic Transform — The Speedy Twins

Two seemingly unrelated mathematical siblings from signal processing and cryptography both harness the same hidden symmetries and…

Jun 7

Discrete Fourier Transform and the Number Theoretic Transform — The Speedy Twins

Jun 7

How Wi-Fi Devices Learn about Thread Services with mDNS

Thread network sensors announce their services (measuring temperature, detecting motion, etc.) to Wi-Fi devices with Multicast DNS (mDNS)…

Apr 16

How Wi-Fi Devices Learn about Thread Services with mDNS

Apr 16

Measuring the frequency distortion of my sound card with Fourier

I was hoping to use my sound card to simulate a software-defined radio by making use of sound instead of radiofrequency signals. Is my…

Feb 23

Measuring the frequency distortion of my sound card with Fourier

Feb 23

Get it or forget it: How Bluetooth LE Audio sends data

Bluetooth LE Audio needs to get data to the receiver on time or get dropped. It works with low power, low computation devices. How could I…

Jan 14

Get it or forget it: How Bluetooth LE Audio sends data

Jan 14

Sweeping frequencies with GNU Radio

I want to experiment with analog and digital communication using a very low-cost USB sound card and GNU Radio. Before I try that, I should…

Dec 13, 2024

Sweeping frequencies with GNU Radio

Dec 13, 2024

Matter.js: Adding a Brightness Control to a Light

I used Matter’s open-source JavaScript code to add brightness control and explore how it is implemented in code. This is part 2 of a series…

Nov 18, 2024

Matter.js: Adding a Brightness Control to a Light

Nov 18, 2024

Experimenting with Key Derivation Functions in Rust

I experimented in Rust with Key Derivation Functions (KDFs) used in Signal’s double ratchet protocol and this is what I learned.

Oct 8, 2024

Experimenting with Key Derivation Functions in Rust

Oct 8, 2024

Turning on a Light with JavaScript

I used Matter’s open-source JavaScript code to control a light with a Raspberry Pi (RPi) and the Google Home app. This is part 1 of a…

Sep 3, 2024

Turning on a Light with JavaScript

Sep 3, 2024

Text Command Troubleshooting with Bluetooth Classic

I wanted to create a wireless serial link to troubleshoot my non-wireless Arduino project and I didn’t want it to cost a fortune. Here’s…

Aug 5, 2024

Text Command Troubleshooting with Bluetooth Classic

Aug 5, 2024

mDNS in action with the home automation Matter protocol

Real life example of mDNS being used to find and add devices to a home automation network.

Jul 4, 2024

mDNS in action with the home automation Matter protocol

Jul 4, 2024

Paul Otto

Paul Otto

Friend of Medium

I enjoy exploring the full wireless stack and experimenting with embedded Rust. I'm often hanging out at the Charlottesville Rust Meetup.

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