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Andrii Rudenko kolobock

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  • Odessa, Ukraine
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@hasumikin
hasumikin / PicoRuby-Workshop-2025-5.md
Last active February 16, 2026 08:06
@hasumikin
hasumikin / PicoRuby-Workshop-2025-4.md
Last active February 16, 2026 08:08
@hasumikin
hasumikin / PicoRuby-Workshop-2025-3.md
Last active February 16, 2026 08:09

※和文はページ下部にあります

PicoRuby Workshop 2025 - Buzzer & PWM

Previous sections:

  1. Setup + LED: https://tinyurl.com/picoruby-2025
  2. Microphone: https://tinyurl.com/picoruby-mic

In this section, we'll learn about PWM (Pulse Width Modulation) - a powerful technique that allows us to simulate analog signals using digital outputs. We'll use PWM to create sounds with a buzzer and control LED brightness smoothly.

@hasumikin
hasumikin / PicoRuby-Workshop-2025-2.md
Last active February 16, 2026 08:09

※和文はページ下部にあります

PicoRuby Workshop 2025 - Microphone & ADC

Previous sections:

  1. Setup + LED: https://tinyurl.com/picoruby-2025

In this section, we'll learn about analog-to-digital conversion (ADC) and explore how to read analog sensors. We'll use a microphone to detect sound levels and also explore the RP2350's built-in temperature sensor.

@hasumikin
hasumikin / PicoRuby-Workshop-2025-1.md
Last active February 16, 2026 08:11
@matthewrudy
matthewrudy / db-structure-clean.rake
Created February 26, 2017 23:40
Clean differences from your rake db:structure:dump - it seems to work for 9.4, 9.5 and 9.6
# frozen_string_literal: true
namespace :db do
namespace :structure do
STRUCTURE_PATH = 'db/structure.sql'
def clean_structure_file
original = File.read(STRUCTURE_PATH)
cleaned = original.dup
@pixeltrix
pixeltrix / time_vs_datatime.md
Last active September 28, 2025 09:53
When should you use DateTime and when should you use Time?

When should you use DateTime and when should you use Time?

It's a common misconception that [William Shakespeare][1] and [Miguel de Cervantes][2] died on the same day in history - so much so that UNESCO named April 23 as [World Book Day because of this fact][3]. However because England hadn't yet adopted [Gregorian Calendar Reform][4] (and wouldn't until [1752][5]) their deaths are actually 10 days apart. Since Ruby's Time class implements a [proleptic Gregorian calendar][6] and has no concept of calendar reform then there's no way to express this. This is where DateTime steps in:

>> shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
=> Tue, 23 Apr 1616 00:00:00 +0000
>> cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
=> Sat, 23 Apr 1616 00:00:00 +0000
@chrisb
chrisb / gist:4d6a09c6cc1ca2e1b14e
Last active November 25, 2022 04:15
Homebrew, Ruby, and Rails on OS X 10.10

OS X 10.10 Guide

Here's what I did to get things working.

1. Install Xcode 6

Yep, over at: https://developer.apple.com

2. Install the Command Line Tools (CLT)

@mestizo
mestizo / gist:9167834
Last active February 23, 2026 11:22
Completely disable IPv6 on OSX
#To Get List of Hardware
sudo networksetup -listallhardwareports
#To Disable IPv6 on Wifi Adapter
sudo networksetup -setv6off wi-fi
#To Disable IPv6 on Built-in Ethernet Adapter
sudo networksetup -setv6off Ethernet
@rgreenjr
rgreenjr / postgres_queries_and_commands.sql
Last active March 12, 2026 09:21
Useful PostgreSQL Queries and Commands
-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
FROM pg_stat_activity
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start desc;
-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query
FROM pg_stat_activity
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'