We started producing shows as Today with a Techie on 2005-09-19, 15 years, 1 months, 5 days ago. Our shows are produced by listeners like you and can be on any topic that "are of interest to hobbyists". If you listen to HPR then please consider contributing one show a year. If you record your show now it could be released in 7 days.
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We are running very low on shows at the moment. Have a look at the hosts page and if you don't see "2020-??-??" next to your name, or if your name is not listed, you might consider sending us in something.
There are no files to process on the FTP server.
---
- hosts: localhost
tasks:
- name: read subnet 10
read_csv:
path: 10.csv
fieldnames: mac,ip,hostname
register: subnet_10
- name: read subnet 11
read_csv:
path: 11.csv
fieldnames: mac,ip,hostname
register: subnet_11
- name: read static
read_csv:
path: static.csv
fieldnames: hostname,ip
register: static_ip
- name: write dhcp file
template:
src: dhcpd.conf.j2
dest: /etc/dhcpd.conf
validate: dhcpd -nc %s
- name: write local.lan zone file
template:
src: local.lan.zone.j2
dest: /var/nsd/zones/master/local.lan
owner: root
group: _nsd
validate: nsd-checkzone local.lan %s
- name: nsd_conf
copy:
src: nsd.conf
dest: /var/nsd/etc/nsd.conf
owner: root
group: _nsd
validate: nsd-checkconf %s
- name: restart nsd
service:
name: nsd
state: restarted
- name: restart dhcpd
service:
name: dhcpd
state: restarted
- name: restart unbound
service:
name: unbound
state: restartedb8:27:eb:8b:7a:6d,192.168.10.100,pi3a
b8:27:eb:ef:f2:d4,192.168.10.101,pi3b
28:10:7b:25:d5:60,192.168.10.79,ipcam3
28:10:7b:0c:fa:7b,192.168.10.80,ipcam1
f0:7d:68:0b:ca:56,192.168.10.81,ipcam2tplink,192.168.10.2
gate,192.168.10.10
www,192.168.10.10
fox,192.168.10.17option domain-name "local.lan";
option domain-name-servers 192.168.10.10;
subnet 192.168.10.0 netmask 255.255.255.0 {
option routers 192.168.10.10;
range 192.168.10.161 192.168.10.179;
{% for host in subnet_10.list %}
host static-client { hardware ethernet {{ host.mac }};fixed-address {{ host.ip }};} #{{ host.hostname }}
{% endfor %}
}
subnet 192.168.11.0 netmask 255.255.255.0 {
option routers 192.168.11.10;
range 192.168.11.72 192.168.11.127;
{% for host in subnet_11.list %}
host static-client { hardware ethernet {{ host.mac }};fixed-address {{ host.ip }};} #{{ host.hostname }}
{% endfor %}
}
host static-client { hardware ethernet b8:27:eb:de:2f:38;fixed-address 192.168.10.45;} #pi3a
host static-client { hardware ethernet 28:10:7b:25:d5:60;fixed-address 192.168.10.79;} #ipcam3
host static-client { hardware ethernet 28:10:7b:0c:fa:7b;fixed-address 192.168.10.80;} #ipcam1
$TTL 3600
local.lan. IN SOA a.root-servers.net. root. (
2016092901 ; Serial
3H ; refresh after 3 hours
1H ; retry after 1 hour
1W ; expire after 1 week
1D) ; minimum TTL of 1 day
IN NS gate.
IN MX 50 gate.local.lan.
local.lan. IN A 192.168.10.10
{% for host in static_ip.list%}
{{ host.hostname }} IN A {{ host.ip }}
{% endfor %}
{% for host in subnet_10.list%}
{{ host.hostname }} IN A {{ host.ip }}
{% endfor %}
{% for host in subnet_11.list%}
{{ host.hostname }} IN A {{ host.ip }}
{% endfor %}
pi3b IN A 192.168.10.101
pi3a IN A 192.168.10.45
ipcam3 IN A 192.168.10.79
ipcam1 IN A 192.168.10.80ansible-playbook hostname-setup.ymlA very brief history of lighting
Natural light first came from fire
Then using oil and fat with a wick
Early candles used animal fat this smelled awful and tended to spit
Some parts of world used whole animals as candles
These early candles gave so little light that people generally just went to bed at sunset
Electric lighting started first by Humphry Davy in the early 1800’s using an arc, this was developed into commercial lighting in the 1840s
Arc lighting needed a complex mechanism to gradually push the contacts together as they burnt away
Gas lighting started around the 1850s this was improved in the 1870 with the advent of the Gas mantel.
Thomas Edison develop the electric light bulb in 1879 using a carbon filament. It took a great deal of effort to convince people to use it because gas lighting was so well established and worked well.
Many houses in Britain didn't install electric lighting until the 1930s
Finally electricity won as it could be used for so many other things.
The tungsten filament bulb
The filament within the bulb is made up of a tungsten coiled coil wire. This is done because the more compactly a filament can be wound the less heat is lost to the surroundings and the brighter the bulb will glow.
The tungsten halogen bulb
The next progression was tungsten halogen bulb, these bulbs are more efficient and give out twice as much light as ordinary bulbs and usually last twice as long.
All filament lights waste a lot of energy producing heat. An ordinary light bulb only gives out 10% of its energy as light, the rest is wasted as heat.
Fluorescent neon lights
Fluorescent neon lights were invented in 1905 by a French man called George Claude. These were used for advertising mainly in America.
Fluorescent strip light
The first fluorescent light was introduced in 1939 it uses the same principle as the neon light but incorporates a filament at both ends. It is filled with argon and mercury vapour. It mainly gives off ultra violet light the tube is coated on the inside with chemicals to convert the output to mostly visible light using a property called fluorescence.
Fluorescent tubes are four times as efficient as normal incandescent light bulbs and run cool.
The first energy efficient light bulbs were just fluorescent lights folded into a compact bulb shape.
Sodium lights
Sodium lights used mainly in street lighting are twice as efficient again as fluorescent bulbs they give off a rather horrible orange colour.
The first commercial high-pressure sodium lamps were available in 1965 from companies in the United States, the United Kingdom, and the Netherlands; at introduction a 400 watt lamp would produce around 100 lumens per watt https://en.wikipedia.org/wiki/Sodium-vapor_lamp
The next big development was LED lighting which I'll cover in my next episode.
Hosted by Ahuka on 2020-10-16 is flagged as Clean and released under a CC-BY-SA license.
Tags: Health, Infectious Disease, History, Pandemics.
Listen in ogg, spx, or mp3 format.
Series: Health and Healthcare | Comments (1)
This is a look at how infectious diseases have changed the course of human history. It is admittedly a bit Euro- or Western-centric since that is what I know best. But I think the point of its importance applies more broadly.
In this episode Martin discovers that protecting pictures of stick insects (rated XXX or not) on USB sticks (pun intended) can be an ardous endeavour indeed. Never mind eventually turning this into a business including web servers, shared file spaces and password storage. Additional bonus: the lovely Emma from Rainbow Escorts makes another cameo apperance supported by some Irish, um, students.
This show explains the concept of injecting symbolic links into zipfiles and how those can be used to attack a web application.
Hosted by Dave Morriss on 2020-10-13 is flagged as Explicit and released under a CC-BY-SA license.
Tags: COVID-19,SARS-Cov-2,Vitamin D,6502 microprocessor,BBC Micro.
Listen in ogg, spx, or mp3 format.
Comments (0)
Two HPR hosts from Scotland get together over Mumble one more time to chat about all manner of stuff.
We recorded on Saturday 19th September 2020, which was International Talk Like A Pirate Day, we but managed to avoid any utterances of ARRRR!, and the use of marlinspikes, fids or belaying pins. Also, no timbers were shivered and no mainbraces spliced (not while recording anyway).
Some of the topics we discussed:
SARS-CoV-22 (as opposed to SARS-CoV-1, the previous SARS coronavirus). The disease is called COVID-193.SARS-CoV-2.Vitamin D3 is also known as cholecalciferol.↩︎
SARS-CoV-2: SARS stands for Severe Acute Respiratory Syndrome, CoV means Corona Virus and the 2 refers to the second SARS corona virus in recent times.↩︎
COVID-19: simply means coronavirus disease 19, referring to its arrival in 2019.↩︎
Some clarification of the types of mask being used most commonly might be needed. Andrew was thinking of the fabric masks when speaking about this. Some research after the recording discovered a mask-related trial as follows: Human coronavirus data from four clinical trials of masks and respirators.↩︎
Hosted by JWP on 2020-10-12 is flagged as Explicit and released under a CC-BY-SA license.
Tags: realvnc, remote computing.
Listen in ogg, spx, or mp3 format.
Comments (0)
Just a short podcast about RealVNC cloud offering. An interesting VNC option if you want to connect on the road or the at the coffee shop to a server back home without putting holes in your router.
Hosted by Ahuka on 2020-10-09 is flagged as Clean and released under a CC-BY-SA license.
Tags: GIMP, images, photos, graphics, paths, zoom, GEGL.
Listen in ogg, spx, or mp3 format.
Series: GIMP | Comments (2)
The Miscellaneous tools do a number of useful things without fitting neatly into a category. The Paths tool takes Selections up a notch and also lets you add interesting effects. Zoom is one you would use every day, and Measure is handy in some situations. Finally, GEGL Operations are the future of all GIMP development
Hosted by Archer72 on 2020-10-08 is flagged as Clean and released under a CC-BY-SA license.
Tags: dvd, blu-ray, backup.
Listen in ogg, spx, or mp3 format.
Comments (1)
Installed Fedora 32 on a spare laptop
To ignore the handle switch on the laptop triggering a power off:
Put HandleLidSwitch=ignore in /etc/systemd/logind.conf
dnf install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
dnf install zlib-devel openssl-devel expat-devel ffmpeg ffmpeg-devel qt5-qtbase-devel
mkdir git/makemkv.source
cd makemkv.source
wget https://www.makemkv.com/download/makemkv-oss-1.15.2.tar.gz
wget https://www.makemkv.com/download/makemkv-bin-1.15.2.tar.gz
tar xpf makemkv-oss-1.15.2.tar.gz
tar xpf makemkv-bin-1.15.2.tar.gz
cd makemkv-oss-1.15.2/
./configure
make
sudo make install
cd ../makemkv-bin-1.15.2/
make
sudo make installflatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak install flathub com.makemkv.MakeMKVdnf install libtesseract-dev autoconf sysconftool
git clone https://github.com/CCExtractor/ccextractor.git
cd ccextractor/linux/
./build
ffmpeg -i $1 -b:a 128k -b:v 2000k -vcodec mpeg4 -acodec aac "encoded"/"`basename -s .mkv $1`-_2000k_aac.mkv"Updated registration key for MakeMKV
Github link to MakeMKV registration update script
How to install MakeMKV on Fedora Linux
Forum post for MakeMKV on Linux
For DVD's
mplayer dvd:///_/dvd/mount/dir_For Blu-ray discs
Download keydb.cfg and place it in ~/.config/aacs/
Link to keydb.cfg
mplayer br:///_/bluray/mount/dir_
ie. mplayer br:////dev/sr0 <br>note the 3 forward slashes before the block device, as the disk will not be read otherwise
Ripping:
mplayer br:////dev/sr0 -alang en -dumpstream -dumpfile $movie.mpgEncoding:
mkdir encoded
ffmpeg -i $1 -map 0:0 -map 0:1 -b:a 128k -b:v 2000k -vcodec mpeg4 "encoded"/"`basename -s .mpg $1`.mkv"Is it antiquated to want to rip Blu-ray/DVD disks to a server?
Is there a better way to accomplish this, rather than using MakeMKV, which continues to be Beta software, and not Free and Open Source?
1 - Bending Tools
This is how I clamped up the conduit bending tool in the trusty workmate. In this configuration you can bend the tube to specific angles and make sure the bends stay in plane. The goal here is to create two side rails that are identical. The seat webbing is sewn on to these rails.
2 - Needed weights
This photo shows some more of how the bending jig was set up. Those are counter weights needed to keep the jig on the ground while the tube is being bent.
3 - Seat rail plans
Mr. Carson provides pdf files that you can print out to be used as templates to match your bends.
4 - Marking tubes
5 - Sighting down tube
6 - Using marks
7 - Help with angles
8 - Matching to plans
Pictures 4-8 show the layout of the tubes and how the marks are used to ensure you make mirror image rails for the seat.
9 - Matching sides
10 - Seat backs
11 - Drilling fish mouths
12 - Seat backs ready for trimming
13 - Finished seat backs
14 - Jigging up
Pictures 9-14 outline the steps in fabricating the seat backs. The seat backs tie the rails together and are where the clamps that connect the seat to the frame grab the seat. This part of the construction can be overwhelming if you don't take it one step at a time. I had to constantly remind myself that building the bike was not a race but a journey, take your time and enjoy each little milestone. The last picture is the seat frame jigged up and ready for brazing.
15 - Seat stay one
16 - Seat stay two
The seat stay was at first glance very intimidating. This piece connects the back of the seat down to the frame, supporting the upper part of your body. Its made of many parts, but all they are is cut up pieces of steel rod and threaded rod that are brazed together. No bending is involved only cutting and brazing and in the end it wasn't to difficult to fabricate.
17 - Seat stay three
The completed seat connected to the frame. The seat is clamped to the frame using hose clamps and clamping blocks made of conduit cut length wise and brazed together at right angles.
18 - Seat webbing one
19 - Seat webbing two
The seat webbing is sewn on using fishing line as described on the website, the only challenge is getting it nice and tight. Needle, line and a few hpr episodes is all you need to get through the task.
20 - Finished
The last picture is the bike finished and ready for its maiden journey.
Hello Hacker Public Radio, Brian in Ohio here.
I am out from under my rock, and doing the last of the recumbent bike build episodes. My wife and I are visiting the land of our youth, Colorado, so my recording stuff is at home, hence the espeak rendition of the show. I finished building the bike a while ago and have been riding it around town to do errands and get exercise. I love this bike! The comfort level is unparalleled. Its like sitting in a chase lounge. No more neck strain or pain in the derriere. You don't need any fancy bike clothes, like padded biking shorts, in order to feel comfortable. The bike is fast and has responsive handling. Somethings I have learned so far while riding the bike. First, a rear view mirror really helps when riding on the street. Unlike upright bikes turning your head to look back to clear for traffic is not as easy. Next, the handling takes some getting used to. The long lever arm of the steering tube makes the bike feel jerky when you first ride it. After a while you'll see that a light hand on the tiller goes a long way to smoothing out the ride. It took me a bit of practice to gracefully get the bike started after coming to a stop. Because you can't stand up and hammer on the peddles, coming to a stop requires a bit of work on the gears. Being in a easy gear then shifting up as you get moving is the way to go. If you build one of these bikes, and why wouldn't you, you will have to think about storage because throwing a back pack on is not really an option. I found a bike rack that attaches to the back of the bike, a grocery store plastic basket and an instructive video tutorial by C J Hoyle on you tube took care of my storage needs, a link is in the show notes. The last parts that need to be fabricated to complete the bike were the seat and the handle bars, and all of there associated bits and pieces that make up these assemblies. Instead of narrating through all the pictures, I leave you, dear hacker public radio listener, that's interested to look at the pictures and read the captions yourself. My general impressions of building the pieces are as follows. The handle bars are relatively easy to fabricate but the big problem for me was the metal on the handle bars you use to make the tiller did not braze well with the conduit. In the end I had to resort to pop rivets and a through bolt to get a safe, sturdy connection. The seat is a collection of many parts and at first glance can be a bit overwhelming. By examining the photos on the recycled recumbent website and studying the plans, focusing on each step the seat came out fine for me, yours will too. The side rails are bent using a conduit bender and the challenge is getting the two sides close to match. Take your time and get some extra conduit, you're probably going to need it. The seat back stay is pretty easy to make, but it is made up of quite a few parts, requiring simple cuts and brazing to fashion it. The rest of the seat parts, the various fittings used to clamp the seat to the frame are pretty easy to make and I can't compliment Mr. Carsen highly enough for his ingenious design. Fitting out the bike; getting wheels, brakes and drive train together are going to be unique to every bike and will depend on how much money you want to spend, what parts you have laying around and what fittings you might have to create to attach the parts. I opted to use used parts that were at hand so I could get the bike up and running. I plan on upgrading parts, making changes and improvements after I've ridden the bike for a few months and gotten a good number of miles under my belt. I'll do an update show in the future to let you know what I've done. Will I do this again? Yes definitely I will build another bike, maybe a mach two or three, the building is fun the bike rides great. Mr Carsen sells parts, kits and completed bikes on his website. When I do it again I may opt to buy the seat from him. I would recommend this project to anyone. You can, go out and build one yourself.
This is Brian in Ohio signing off for now reminding every one to: go fast; take chances.
Get a full list of all our shows.