Luiz Fellipe Carneiro fellipec

Some devices, like Bluetooth decoders, have problems with some noise when connected to amplifiers or receivers. Apparently, most of times the issue is a ground loop. That can happen in several devices, like those generic MP3/Bluetooth boards, or those USB powered adapters intended to use in older car units, when the same power supply delivers energy to the amplifier and to the Bluetooth receiver.

One fix is to power the Bluetooth receiver with another power supply. This can work in a car, where instead of using the head unit USB port, you use a cigarette lighter outlet or a power bank. But in the case of a custom speaker like, that is not feasible, or at least impractical.

Enter the DC-DC isolated converters, like the B1212S and others DC-DC isolators. They ta

Introduction

Pi-Hole's primary function is to be a DNS server with the ability to block domains, usually used for advertising, tracking or other unwanted sites. It also features a built-in DHCP Server.

Usually, your router will also have a built-in DHCP server, pre-configured from factory, and for most users this is perfectly fine. But in some cases you may want to run another DHCP server instead of relying on your router's one. This guide will help you understand how a DHCP server works and how to configure it without disturbing your network.

If you already know the networking basics, you can cut to the chase and read just the configuration part

Understanding the IP Addressing

To Linux evertything is a file.

When you run mkfs.ext4 /dev/sdx or mkfs.ext4 /dev/sdx1 or even mkfs.ext4 /tmp/dummyfile it doesn't care where it is creating your filesystem, it just does.

Let's demonstrate:

First, let's create a 1GB file in my home dir:

dd if=/dev/zero of=testfile bs=1G count=1 oflag=direct status=progress

Enable fingerprint authentication, but not for the first login

Install and enable the fingerprint authentication in pam

First, install the required packages and enable fingerprint support in the PAM configuration:

# Install the module
sudo apt install fprintd libpam-fprintd

Create LUKS Encrypted Disk Image

Create an empty virtual disk

dd if=/dev/zero of=/home/user/luksvolume1 bs=1M count=512

	#include <Wire.h>


	// Mudar conforme a placa
	#define SDA_PIN = 14
	#define SCL_PIN = 12

	void setup() {
	Wire.begin(SDA_PIN, SCL_PIN);
	Serial.begin(115200);

	#!/usr/bin/python3
	import gpsd
	import datetime
	import os
	from time import sleep
	from pyfiglet import Figlet

	#Figlet needs the terminal width to proper center the text
	col = os.get_terminal_size().columns

	Dryer Drying
	Filament Temperature Time (Hours)

	PLA 55°C (131°F) > 6
	ABS 65°C (149°F) > 6
	PETG 65°C (149°F) > 6
	Nylon 75°C (167°F) > 24
	Desiccants 65°C (149°F) > 6
	PVA 45°C (113°F) > 24
	TPU/TPE 55°C (131°F) > 8

	#!/usr/bin/bash

	# Change to recording directory
	cd /samba/ipcam

	# Amount of time of the recording session
	# Adjust to match the cron schedule
	end=$((SECONDS+3599))

	ffmpeg -i http://192.168.1.150:8080/?action=stream -vsync cfr -r 0.1 -f image2 '/home/luiz/timelapse/img-%03d.jpg'
	ffmpeg -i '/home/luiz/timelapse/img-%03d.jpg' -c:v libx264 -crf 0 '/home/luiz/timelapse.mp4'