SICK Theme Park Rides

ARABIC BUFFET

vivado rgb light

//add source -> verilog file

//rgb.v

`timescale 1ns / 1ps

module rgb(

    input wire [3:0] switch,

    output wire red,

    output wire green,

    output wire blue

    );

    

assign red = ~switch[3] & ~switch[2];

assign blue = (~switch[3] & switch[2]) | (switch[3] & ~switch[2] & ~switch[1]);

assign green = (switch[3] & ~switch[2] & switch[1]) | (switch[3] & switch[2]);

    

endmodule

---------------------

//right click simulation -> add verilog file

//testbench.v

`timescale 10ns / 1ps

module testbench;

//input

reg [3:0] switch = 0;

//output

wire red;

wire green;

wire blue;

//unit under test

rgb rgb(

    .switch(switch),

    .red(red),

    .green(green),

    .blue(blue)

);

integer k = 0;

initial

begin

    switch=0;

    

    for(k=0; k<16; k=k+1)

    #10 switch = k; //100ns

    

    #5 $finish;

end

endmodule

-----------------

//run behavioral simulation

step foward 0.1us, refresh button

drag and drop top left to zoom out, bottom right to zoom in

reference:

https://chuanshuoge3.blogspot.com/2022/04/vivado-2.html

vivado mux

download and install vivado @ https://www.xilinx.com/support/download.html

add a verilog file to design source

run rtl analysis

reference:

https://chuanshuoge3.blogspot.com/2022/04/vivado-2.html

Vivado 2

https://www.xilinx.com/video/hardware/verilog-modules-and-ports.html

https://www.youtube.com/watch?v=-Kdbzax9EOQ&ab_channel=SimplyEmbedded

https://www.youtube.com/watch?v=PJGvZSlsLKs&ab_channel=IntelFPGA

Vivado Simulator 1

Mother Nature Got Angry

qsim 1

reference:

https://www.youtube.com/watch?v=a8JAkKhxlQI

blender well 5

ctrl+alt+num pad 0 to center camera view

change focal length, increase end distance

reference:

https://chuanshuoge3.blogspot.com/2022/04/blender-well-4.html

進階 林俊傑

blender well 4

add three point lights, add area light in well center

in shading tab, scene property->film->transparent to set background transparent

shift+click beams, shift+click colored pole last, ctrl+L to link materials

create 3 color materials for roof

tab to edit, L to select each tile, assign different colors

reuse the materials on one roof to the other

assign material varieties to bricks and stones 

reference:

https://www.youtube.com/watch?v=m7m3QkwRcGE

汉中

blender well 3

add beam to roof, turn on proportional editing, move rope and beam

shift+a to add a circle, f to fill circle, add solidify modifier for base plane

shift+a ico sphere, change vertices to 1

proportional edit, rotate so they look like stones

reference:

https://www.youtube.com/watch?v=m7m3QkwRcGE

Animal Genius

history of the Red Army

blender rope

shift+a->cylinder, select 8 vertices, rotate cylinder

ctrl+r to loop cut->scroll to increase loops,

2 to edge select, shift+alt+click to include loops on both ends, ctrl+b to bevel

3 to select face, shift+alt+click to select loop faces

change to pivot around individual origin

e to extrude, s to scale, shift+x to cancel x direction scale

2 to select edges, shift+alt+click to select loop cut, x to desolve

shift+alt+click to select inside cylinder faces

s+x to scale along x, side faces on big cylinders are auto tapered

reference:

https://www.youtube.com/watch?v=m7m3QkwRcGE

blender tile 2

in edit mode, p->seperate by parts

in object mode, object->set origin->to geometry

in object mode, ctrl+j to join

in edit mode, L to select individual item, Alt+A to deselect all

bring tiles on the roof

shift+right click to center at tile center

shift+A->lattice->scale->rotate (double press axis for local axis)

shape lattice so that tiles are encapsulated

lattice property->change resolution to 5

select tiles first then lattice->ctrl+p->lattice deform

select lattice->tab to edit mode->lift up edges->sink in middle

tiles follow lattice to deform into concave shape.

select tile->m to create a new collection (tiles)

select lattice->m to move lattice to tiles collection

reference:

https://www.youtube.com/watch?v=bWHhx4uos84

The Science of Bubbles

blender beam

in object mode, shift+d duplicate, ctrl+j join, object->convert to->mesh apply all modifier

in edit mode, 2 select edge, alt+click select loop, x remove loop or edge

3 select face, r rotate, g move

Unsettling Sky Phenomena

湛江海鲜

OpenVPN setup

test openssl is installed

>openssl version

OpenSSL 3.0.2 15 Mar 2022 (Library: OpenSSL 3.0.2 15 Mar 2022)

generate certificate

download easy-rsa @ https://github.com/OpenVPN/easy-rsa-old

extract, copy openssl-1.0.0.cnf from 2.0 folder to windows

>init-config

in vars.bat, change openssl.exe path, and easy-rsa path

rem Alternatively define the PATH to openssl.exe manually

set "PATH=%PATH%;C:\Program Files\OpenSSL-Win64\bin"

set HOME=C:\Users\zchen\Downloads\easy-rsa-old-master\easy-rsa\Windows

set KEY_CONFIG=openssl-1.0.0.cnf

>>clean-all

The system cannot find the file specified.

        1 file(s) copied.

        1 file(s) copied.

>build-ca

>build-key-server server

Please enter the following 'extra' attributes

to be sent with your certificate request

A challenge password []:abcd

An optional company name []:abcd

Using configuration from openssl-1.0.0.cnf

Check that the request matches the signature

Signature ok

The Subject's Distinguished Name is as follows

countryName           :PRINTABLE:'US'

stateOrProvinceName   :PRINTABLE:'CA'

localityName          :PRINTABLE:'SanFrancisco'

organizationName      :PRINTABLE:'OpenVPN'

organizationalUnitName:PRINTABLE:'changeme'

commonName            :PRINTABLE:'changeme'

name                  :PRINTABLE:'changeme'

emailAddress          :IA5STRING:'mail@host.domain'

Certificate is to be certified until Apr 13 15:32:32 2032 GMT (3650 days)

Sign the certificate? [y/n]:y

1 out of 1 certificate requests certified, commit? [y/n]y

Write out database with 1 new entries

Data Base Updated

>build-key client1

Please enter the following 'extra' attributes

to be sent with your certificate request

A challenge password []:abcd

An optional company name []:abcd

Using configuration from openssl-1.0.0.cnf

Check that the request matches the signature

Signature ok

The Subject's Distinguished Name is as follows

countryName           :PRINTABLE:'US'

stateOrProvinceName   :PRINTABLE:'CA'

localityName          :PRINTABLE:'SanFrancisco'

organizationName      :PRINTABLE:'OpenVPN'

organizationalUnitName:PRINTABLE:'changeme'

commonName            :PRINTABLE:'changeme'

name                  :PRINTABLE:'bob'

emailAddress          :IA5STRING:'mail@host.domain'

Certificate is to be certified until Apr 13 16:00:20 2032 GMT (3650 days)

Sign the certificate? [y/n]:y

1 out of 1 certificate requests certified, commit? [y/n]y

Write out database with 1 new entries

Data Base Updated

>build-dh

Generating DH parameters, 2048 bit long safe prime

add openvpn.exe path (C:\Program Files\OpenVPN\bin) to environment variable -> user variable -> Path -> new

>openvpn --genkey tls-auth ta.key

right click on openvpn icon in the task bar -> setting -> copy config path

copy server files into config folder

server starts

copy client files to config folder in client laptop

in client.opvn file, remote my-server-1 1194, replace my-server-1 with server name

client successfully connected to server

//server log

Sat Apr 16 13:48:29 2022 Initialization Sequence Completed

Sat Apr 16 13:48:29 2022 MANAGEMENT: >STATE:1650138509,CONNECTED,SUCCESS,10.8.0.1,,,,

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 TLS: Initial packet from [AF_INET6]::ffff:192.168.0.34:55176, sid=b83b63c5 fccaa0bd

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 VERIFY OK: depth=1, C=US, ST=CA, L=SanFrancisco, O=OpenVPN, OU=changeme, CN=changeme, name=changeme, emailAddress=mail@host.domain

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 VERIFY OK: depth=0, C=US, ST=CA, L=SanFrancisco, O=OpenVPN, OU=changeme, CN=changeme, name=bob, emailAddress=mail@host.domain

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_VER=2.5.6

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_PLAT=win

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_PROTO=6

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_NCP=2

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_CIPHERS=AES-256-GCM:AES-128-GCM:AES-256-CBC

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_LZ4=1

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_LZ4v2=1

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_LZO=1

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_COMP_STUB=1

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_COMP_STUBv2=1

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_TCPNL=1

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_GUI_VER=OpenVPN_GUI_11

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 peer info: IV_SSO=openurl,crtext

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 Control Channel: TLSv1.3, cipher TLSv1.3 TLS_AES_256_GCM_SHA384, peer certificate: 4096 bit RSA, signature: RSA-SHA256

Sat Apr 16 13:49:34 2022 192.168.0.34:55176 [changeme] Peer Connection Initiated with [AF_INET6]::ffff:192.168.0.34:55176

Sat Apr 16 13:49:34 2022 changeme/192.168.0.34:55176 MULTI_sva: pool returned IPv4=10.8.0.6, IPv6=(Not enabled)

Sat Apr 16 13:49:34 2022 changeme/192.168.0.34:55176 MULTI: Learn: 10.8.0.6 -> changeme/192.168.0.34:55176

Sat Apr 16 13:49:34 2022 changeme/192.168.0.34:55176 MULTI: primary virtual IP for changeme/192.168.0.34:55176: 10.8.0.6

Sat Apr 16 13:49:34 2022 changeme/192.168.0.34:55176 Data Channel: using negotiated cipher 'AES-256-GCM'

Sat Apr 16 13:49:34 2022 changeme/192.168.0.34:55176 Outgoing Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key

Sat Apr 16 13:49:34 2022 changeme/192.168.0.34:55176 Incoming Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key

Sat Apr 16 13:49:34 2022 changeme/192.168.0.34:55176 SENT CONTROL [changeme]: 'PUSH_REPLY,route 10.8.0.1,topology net30,ping 10,ping-restart 120,ifconfig 10.8.0.6 10.8.0.5,peer-id 0,cipher AES-256-GCM' (status=1)

reference:

https://youtu.be/Qj-qPgn1B04

install openssl

https://thesecmaster.com/procedure-to-install-openssl-on-the-windows-platform/

create configuration files

https://openvpn.net/community-resources/creating-configuration-files-for-server-and-clients/

generate CA certificate

https://openvpn.net/community-resources/how-to/#pki

Cannot pre-load keyfile (ta.key)

https://www.reddit.com/r/OpenVPN/comments/n04ink/cannot_preload_keyfile_takey_on/

 "Insufficient key material or header text not found in file '[[INLINE]]' (0/128/256 bytes found/min/max)"

https://forums.openvpn.net/viewtopic.php?t=25582

https://velenux.wordpress.com/2021/11/11/openvpn-insufficient-key-material-or-header-text-not-found-in-file-error/

Tiny satellites

blender tiles 1

shift+right click to change center

shift+a -> plane

tab to edit mode

ctrl+r+scroll wheel to create 2 loop cuts

extend 2 vertice at loop cut

shift+d to duplicate 2 times

ctrl+r to create horizontal loop cut

press k and draw a line between loop cut intersect and edge

select face and delete

create non-uniformity by move vertices

in object mode, shift select all three tiles

tab to edit mode

press a to select all faces

press e to extrude

press r to rotate tiles, move tiles to overlap them

hold shift to select multiple

shift+d to duplicate

press r to rotate

select all tiles -> ctrl+j to join all to a plane

in sculpting mode, use grab to create variation

press f to change size of area

reference:

https://www.youtube.com/watch?v=bWHhx4uos84

blender well 2

select all cubes -> press m -> new collection

tab to enter edit mode, press o to turn on proportional editing

press 0 for vertices select

grab vertices to make well uneven

shift+a -> add a box -> scale box ->ctrl+a to apply scale

g to move pole -> tab to edit mode -> ctrl+b to bevel

reference:

https://www.youtube.com/watch?v=bWHhx4uos84

Chicago

blender well 1

tab to enter edit mode

press 2 to select edges

ctrl+b to bevel edges

shift+d to duplicate -> press x to move on x

press z -> select wireframe mode

select right face -> g+x to entend

ctrl+r to loop cut in middle

add 3rd box, create 2 loop cut

duplicate 3 times

z -> solid mode

modifier -> simple deform -> bend, 360 degree, z axis

object -> set origin -> origin to geometry

press n -> set x, y, z to 0 to center origin

shift+d to duplicate

s to scale down

r to rotate

duplicate 2 more rings

reference:

https://www.youtube.com/watch?v=OlnkGCdtGEw