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Pi-hole + DoH (cloudflared) Notes

Why this was needed

• Android 12+ aggressively uses DoH (Private DNS) and may bypass local DNS

• Plain Pi-hole blocks ads, but upstream DNS is unencrypted

• We wanted:

  • Ad blocking on home Wi-Fi
  • Encrypted DNS upstream

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wget $(npm view @mediapipe/face_mesh dist.tarball)

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🎞️ FFmpeg Video Cropping Workflow

✅ Step 1: Extract a Frame for Analysis

Extract a single frame (as PNG) from the video at a chosen timestamp:

ffmpeg -ss 00:00:05 -i input.mp4 -frames:v 1 -q:v 2 frame.png

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Data Recovery – Rescue Guide (Linux/Ubuntu)

A step-by-step guide for rescuing data from damaged or unreadable SD cards using Live Ubuntu, ddrescue, photorec, and testdisk.

Prerequisites

• Ubuntu Live USB or Linux system
• Failing SD card (avoid using it on Windows — may cause more damage)
• External drive or enough disk space to store recovery image
• Stable power supply (UPS recommended for long rescues)

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Restore WiFi on Pi 3 Model B

Problem: After flashing the latest Raspberry Pi OS or doing a dist-upgrade, the WiFi interface (wlan0) disappears and no WiFi hardware is detected.

Solution

1. Edit the boot configuration file:

Open /boot/config.txt in a text editor:

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#include <WiFi.h>

const char* ssid     = "ssid";
const char* password = "password";

int btnGPIO = 0;
int btnState = false;

void setup()
{

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import SwiftUI
import UIKit

struct GIFImageView: UIViewRepresentable {
    let gifName: String

    func makeUIView(context: Context) -> UIImageView {
        let imageView = UIImageView()

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git reflog expire --expire=now --all
git gc --prune=now --aggressive

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Use a UUID marker on each build (works even if build number doesn't change)

If you want UserDefaults to clear every time you install a new Debug build via Xcode, regardless of version or build number, you can inject a unique marker that changes on every build.

🔧 1. In your Build Settings (not Info.plist), add a custom build variable:

Go to:

Build Settings → User-Defined → click +

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eval $(ssh-agent -s)
ssh-add ~/.ssh/id_ed25519