moritzmhmk

Using pdftk

Create file pdf_info.txt:

PageLabelBegin
PageLabelNewIndex: 1
PageLabelStart: 1
PageLabelPrefix: Cover
PageLabelNumStyle: NoNumber
PageLabelBegin

moritzmhmk

[Unit]
Description=Node.js HomeKit Server 
After=syslog.target network-online.target

[Service]
Type=simple
User=homebridge
ExecStart=/usr/bin/homebridge -U /etc/homebridge
Restart=on-failure
RestartSec=10

moritzmhmk

const rpio = require('rpio')
rpio.init({mapping: 'gpio'})
rpio.open(17, rpio.OUTPUT)

const defaultProtocol = {
  tristate: true,
  pulseLength: 350,
  zero: {high: 1, low: 3},
  one: {high: 3, low: 1},
  sync: {high: 1, low: 31}

moritzmhmk

hciconfig hci0 up
btmgmt -i hci0 le on
hcitool -i hci0 lescan
gatttool -i hci0 -b XX:XX:XX:XX:XX:XX --characteristics

const noble = require('noble')

moritzmhmk

Installation via WebUI is not possible anymore (Error 18005).

Use TFTP method instead

Currently there is no official Image for v11 that includes luci - use this found here

Guide for macOS

tftp is preinstalled - GUI is available.

moritzmhmk

Sources

• 11.04 Narwhal
• 11.10
• 12.04 Pangolin
• 12.10
• 13.04 Ringtail
• 13.10
• 14.04 Tahr
• 14.10 Unicorn
• 15.04 Vervet

moritzmhmk

read and print recorded date

for i in "$@"
do
	echo $i `mediainfo "$PWD/$i" | grep "Recorded date"`
done

concat multiple files

moritzmhmk

#include <Wire.h> 
// https://bitbucket.org/fmalpartida/new-liquidcrystal/wiki/Home
#include <LiquidCrystal_I2C.h>

// addr, En, Rw, Rs, d4, d5, d6, d7, backlight, backlighPolarity
LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, 0);  // Set the LCD I2C address

void setup()
{
  pinMode(A2, OUTPUT);

moritzmhmk

Using Raspberry Pi Camera with ffmpeg

Capturing video from the rpi camera with ffmpeg can vary from less than 5% to 100% of the CPU (rpi zero) depending on ffmpeg using the hardware acceleration or not.

On many github issues one finds the suggestion of using h264_omx codec to use the gpu - but it does not ship with the default ffmpeg on Raspbian.

Instead I found that one can use the v4l2 driver provided by raspbian to get hardware accelerated h264 output. Also setting the video size will save one from using a (cpu) scale filter.

ffmpeg

capture h264 video from rpi camera

moritzmhmk

EESchema-LIBRARY Version 2.3
#encoding utf-8
#
# STM32F103C8T6
#
DEF STM32F103C8T6 U 0 40 Y Y 1 F N
F0 "U" 200 0 60 H V C CNN
F1 "STM32F103C8T6" 0 0 60 H V C CNN
F2 "" 200 0 60 H I C CNN
F3 "" 200 0 60 H I C CNN