Kazulog | Gruffly describes topics related to entrepreneurship, development, and IT

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[Electronic Circuit] Created a self-made board for bidirectional audio with ESP32+SPH0645LM4H-B (I2S) and placed an order with Elecrow.

How to use SPH0645LM4H-B as a replacement I2S mic for INMP441, wire with ESP32 to make my own board and order from Elecrow. is Elecrow cheaper PCBA cost compared to JLCPCB?

Development/Designelectronic circuit

I tried to make my own board with INMP441 added to ESP32, but INMP441 is out of stock?

I tried to make my own ESP32 board using INMP441 to develop interactive voice for “Mia,” a cat-shaped robot, but the parts were unexpectedly out of stock.

2025.04.16 2025.04.20

Development/Designelectronic circuit

[Rails] RSpec memorandum: describe / context / it / subject / let / let!

This presentation explains how memoization works when using subject in RSpec and the pitfalls of update tests, including why calling subject before does not reflect parameter changes, the correct timing of evaluation, and best practices for test design with concrete examples.

Development/DesignServer (Go/Rails)

ESP32 + I2S microphone (INMP441) to implement speech recognition

Implement speech recognition using ESP32 and INMP441. This time, we only want to quickly verify if the signal is being processed from the I2S microphone, so we will do up to “Receive signal from I2S microphone → Display volume level and sample statistics in real time”.

Development/Designbuilt-in(C++)

React Native: Components, JSX, Props, State

React Native is a framework for developing mobile apps in JavaScript (or TypeScript), enabling development of apps for both iOS and Android with a single code base (cross-platform development).

2025.01.01 2025.01.02

Development/DesignWebapplication(Flutter)

Difference between PDM microphones and I2S: Why does PDM require a decimation filter?

A PDM microphone is a digital microphone that expresses audio signals as a density of pulses. The converted signal consists of “high-density ones and zeros” and includes high-frequency components that exceed the human audible range (20 Hz to 20 kHz). On the other hand, I2S microphones transmit voice data in PCM format

Development/Designelectronic circuit

What is the difference between the O Series and GPT models, and what are the features of O3?

On December 20 (local time), OpenAI of the US announced a new AI model, o3. It is said to have the ability to solve complex problems and perform well in a wide range of fields, including science, mathematics, and coding. o3 mini will be available around the end of January 2025, followed by o3.

AIDevelopment/Design

[GAS] How to post the content entered in a Google Form to a specific channel in Slack.

Using GAS and the Slack API to set up automatic forwarding of submissions to Slack when submitting Google Forms; need to create a Slack app from the Slack API admin page to get the webhook URL.

Development/Design

What is the Grand Unified Theory of the Brain, the Free Energy Principle?

I had been interested in this book, but it had been piled up in my reading pile, so I finally finished it this time. I found the book interesting in its perspective of trying to unify seemingly disparate brain activities such as sensation, movement, emotion, and mental illness from the perspective of free energy.

(somebody's) sideNote/Book

[Book Review] Super-introduction: The Theory of Relativity What did Einstein think?

I was interested in Einstein's theory of relativity, but had never read it before, so I started with a very introductory reading book. It was biting and explained in a way that I could understand if I understood middle school and high school physics level. The process of law unification from Newton to Maxwell to Einstein

(somebody's) sideNote/Book

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