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$fn=100;
markerRadius=1;

circle(r = markerRadius);

quadrant();
mirror([1,0]) quadrant();
mirror([0,1]) quadrant();
mirror([1,0]) mirror([0,1]) quadrant();

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$fn=200;
rotate_extrude()
translate([-22.5,0,0]) union() {
 translate([0,-10,0]) square([7,10]);
 translate([6.5,-3.5,0]) rotate([0,0,45]) square([5,5]);
  intersection() {
      circle(10, center=true);
      square(20);
  };
};

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$fn=100;

// Enclosure for
// http://blog.kehribar.me/build/2015/12/06/polyphonic-fm-synthesizer-with-stm32f031.html

case(drawPart=0); // 0=box, 1=lid, 2==both

module case (
    wall=1.5,            // wall thickness
    

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#!/bin/sh -e
# based on https://gist.github.com/corny/7a07f5ac901844bd20c9

hostname=$1
device=$2

v4_file=$HOME/.${hostname}.dynv6.addr4

[ -e $v4_file ] && old=`cat $v4_file`

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#include "U8glib.h"
#include <Wire.h>

#define TWI_FREQ 400000L

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE);  

const int MPU=0x68;  // I2C address of the MPU-6050
int16_t AcX,AcY,AcZ,Tmp,GyX,GyY,GyZ;

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// workaround for https://code.google.com/p/gdata-issues/issues/detail?id=7163

var d0 = "AEIMQUYcgkosw048";
var d1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var d2 = d1;
var d1c = 0;
var d2c = 0;
var overflowSuffix = "Q";
var direction = "AA";
var d2OverflowCounter = 0;

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#!/usr/bin/env python
# coding=utf-8
'''
Copyright (C) 
2009 Sascha Poczihoski, sascha@junktech.de
original author

2013 Roger Jeurissen, roger@acfd-consultancy.nl
dangling labels and inside/outside scale features

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/**
 * according to http://www.adafruit.com/datasheets/UG-2864HSWEG01.pdf Chapter 4.4 Page 15
 */
void ssd1306Init(void)
{
    i2c_OLED_send_cmd(0xAE); // Set display OFF		
 
    i2c_OLED_send_cmd(0xD4); // Set Display Clock Divide Ratio / OSC Frequency
    i2c_OLED_send_cmd(0x80); // Display Clock Divide Ratio / OSC Frequency 
 

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Hetzner Primary IPv4 IP + IPv4/2x Subnet + "Non-Routed" IPv6/64 Subnet HowTo

... so I do not forget the next time I have to figure this stuff out. And perhaps to help other poor souls fiddling with v6/v4 xen setups in a Hetzner network environment.

Basic setup

You can basically follow along the Xen Project Beginners Guide.

The short version

Install Debian Wheezy via Hetzner's installimage on the rescue system, the only important part about partitioning is that you have an LVM volume group named vg0 with enough space for your guests' disks.

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var pcap=require('pcap');
pcap.createSession("mon0", '(type mgt) and (type mgt subtype probe-req )').
        on('packet', function (raw_packet) {
                with(pcap.decode.packet(raw_packet).link.ieee802_11Frame)
                        if (type == 0 && subType == 4)
                                console.log("Probe request",shost, "-> ",bssid);
        }
);