Vegard Hammerseth

Using void setup() { Serial.begin(9600); } on Arduino and screen /dev/ttyUSB0 9600 on my computer, I managed to send commands back and forth. I hooked up the standard servo library and write some code before I mounted the Arduino board on my mini rock crawler. I now had a computer controlled car. Because of Arduino`s simple interface I had it all up and running around an hour. Check the small video and code below.

You can view and or use the code as you like below. (Sorry about the indention, Wordpress messes it up).

//
// LIBRARY
//
#include

//
// OBJ
//
Servo servo1;
Servo servo2;

// VARS
int readByte;
int servo1Angle = 90; //default servo angle
int servo2Angle = 90;

int minPulse = 700; // minimum servo position
int maxPulse = 2300; // maximum servo position

void setup()
{
servo1.attach(2, minPulse, maxPulse); //connect servo
servo2.attach(3, minPulse, maxPulse);

Serial.begin(9600); // start serial
Serial.println(“Ready\n”);
}

void loop()
{
if (Serial.available() > 1) // procced when two bytes is avaiable
{
readByte; = Serial.read(); //read first byte
if (readByte; == 91)
{
readByte; = Serial.read(); //read second byte to determine arrow type
if (readByte; == 65 && servo1Angle <= 180) //UP
{
servo1Angle += 5;
}
else if(readByte; == 66 && servo1Angle >= 0) //DOWN
{
servo1Angle -= 5;
}
else if(readByte; == 67 && servo2Angle <= 180) //RIGHT
{
servo2Angle += 5;
}
else if(readByte; == 68 && servo2Angle >= 0) //LEFT
{
servo2Angle -= 5;
}

}
}
// set servo positions
servo1.write(servo1Angle);
servo2.write(servo2Angle);
delay(15);
}

Med eller uten? (2008-2009)

Vegard — Mon, 21 Dec 2009 17:24:19 +0000

I år går avogtil.no ut med kampanjen Med eller uten? med budskapet å slå ned på alkoholbruken i juletider. Dette går ut på å få foreldre til å kutte ut alkoholen på julaften til barna sin fordel. Ikke bare foreldre, men alle voksne som feirer sammen med barn.

Hvorfor?
Når du drikker «for mye» vil oppførselen forandre seg. Bare det at du er klar over at du inntar alkohol er med på å forandre oppførselen din. Foresatte har i de fleste oppvekster tjent trygghetsfølelsen hos barnet i begynnelsen og er barnet sitt trygghetssted. Det har du kanskje merket ved at ungen din gjemmer seg bak deg eller søker beskyttelse i dine armer.

Hvis et barn merker at oppførselen din forandrer seg vil barnetets trygghetsfølelse briste eller forsvinne uten å si noe sikkert uten personlig erfaring. Dette er noe som kanskje blir bygget opp igjen da barnet ikke forstår hvorfor du plutslig ble en annen person.

Mulig jeg overdriver, men hva gjør vi vel ikke for fremtiden?

Ha en ellers god og avholdsfri jul.

Chromium, open Spotify links in Gnome

Vegard — Sun, 13 Dec 2009 20:30:36 +0000

Did you ever get a link like http://open.spotify.com/track/1QdXJ6TDYOT7sZyq7WCHhk, but were unable to open it easy? try following:
gconftool-2 --set --type=string /desktop/gnome/url-handlers/spotify/command 'wine "C:\Program Files\Spotify\spotify.exe" /uri "%s"' gconftool-2 --set --type=bool /desktop/gnome/url-handlers/spotify/enabled true gconftool-2 --set --type=bool /desktop/gnome/url-handlers/spotify/need-terminal false

Re wounding a brush less mini motor

Vegard — Fri, 27 Nov 2009 00:02:32 +0000

After running this motor to hard outside, I managed to burn the motor. You can see pictures of the “burnt” motor in the gallery below.

First of all I opened the motor to take a look noticing protective isolation layer on the copper were melted. Not so strange, because when I approaced the motor after the plane fell from the sky, it was insane hot.

Before removing all wire I measured the wire diameter to 0,30mm. I found this king of wire inside very small tranformators in a computer power supply.

By using this picutre, found on this page. I was able to re wound the motor.

I actually did wound all the poles at the same time, well, one by one, but all three wires were in use, if you follow.

After finish wounding I had to connect wires together to make only three wires, brush less motor has three out wires.

Since it`s a pretty fast motor I made a delta hookup, but I did a mistake at first. This motor should have around 195mOhm per 14-turn, maybe I did not mention it is a 14-turn motor. Which means each pole (there are nine here) needs 14 turns of isolated copper wire and in a small motor like this one, it`s not that easy. Anyway, by hooking up wrong end`s I broke a ESC of mine ($10) so I had to buy another one.

The motor works just great now and I might add a video later.

Gallery

Fixing brushless motor

A Clik is born

Vegard — Wed, 25 Nov 2009 09:17:21 +0000

After my first self builded depron was basically a failure, I removed all electronics and carbon from it and threw it away. Electronics on the plane were in good shape so I had to make another one. I have a Blade EPP before, but having two planes in the field is neat when one plane is down and gluing.

The plane is built as light as possible and will probably land around 150g. More information will be available when finished.

Pictures from the build can be viewed here.

A Clik is born

A movie will be available later.

Installing Frets On Fire on Ubuntu by making .deb package

Vegard — Sun, 08 Nov 2009 18:47:06 +0000

sudo apt-get install dh-make mkdir fretsonfire-1.3.110 cd fretsonfire-1.3.110 dh_make -s -n cd debian rm *.ex *.EX mkdir fretsonfire mkdir fretsonfire/usr mkdir fretsonfire/usr/share

Now download the game
wget http://downloads.sourceforge.net/fretsonfire/FretsOnFire-1.3.110.tar.gz?use_mirror=osdn tar zxf FretsOnFire-1.3.110.tar.gz mv Frets\ on\ Fire-1.3.110/ fretsonfire/usr/share/fretsonfire rm -rf Frets\ on\ Fire-1.3.110/ FretsOnFire-1.3.110.tar.gz

mkdir fretsonfire/DEBIAN pico control
Make sure it look something like this
Source: fretsonfire Priority: optional Section: universe/games Maintainer: yourname Homepage: http://fretsonfire.sourceforge.net/ Package: fretsonfire Architecture: all Version: 1.3.110 Depends: python-pygame, python-opengl, python-numpy Description: Open source guitar game

cp control fretsonfire/DEBIAN/ mkdir fretsonfire/usr/bin echo -e "#\!/bin/dash\ncd /usr/share/fretsonfire/src/\npython FretsOnFire.py" > fretsonfire/usr/bin/fretsonfire chmod +x fretsonfire/usr/bin/fretsonfire mkdir fretsonfire/usr/share/pixmaps

# if the following image does not exist, find another one through google
wget http://www.freedownloadsplace.com/photo/Frets-on-Fire-1.png -O fretsonfire/usr/share/pixmaps/fretsonfire.png mkdir fretsonfire/usr/share/applications pico fretsonfire/usr/share/applications/fretsonfire.desktop
Overwrite with this text
[Desktop Entry] Version=1.3.110 Type=Application Name=Frets On Fire Comment=A opensourced guitar game Icon=fretsonfire Exec=fretsonfire Terminal=false Categories=Game;ArcadeGame;

cd .. dh_builddeb cd .. dpkg -i fretsonfire_1.3.110_all.deb

Ubuntu network install (PXE)

Vegard — Sat, 24 Oct 2009 23:11:03 +0000

sudo apt-get install tftpd-hpa tftp-hpa xinetd dhcp3-server sudo pico /etc/xinetd.d/tftp

Then write following
service tftp { protocol = udp port = 69 socket_type = dgram wait = yes user = root server = /usr/sbin/in.tftpd server_args = /var/lib/tftpboot disable = no }

Edit TFTP config
sudo pico /etc/default/tftpd-hpa

Make it look something like
#Defaults for tftpd-hpa RUN_DAEMON="yes" OPTIONS="-l -s /var/lib/tftpboot"

Create TFTP directory and get latest netboot image
sudo mkdir /var/lib/tftpboot cd /var/lib/tftpboot sudo wget -np -r http://archive.ubuntu.com/ubuntu/dists/karmic/main/installer-i386/current/images/netboot/ sudo mv archive.ubuntu.com/ubuntu/dists/karmic/main/installer-i386/current/images/netboot/* . sudo rm -rf archive.ubuntu.com

Now restart TFTPD
sudo /etc/init.d/tftpd-hpa restart

To check if running@
netstat -uap

For DHCP, make sure you have a fixed ip for your device
pico /etc/dhcp3/dhcpd.conf

I did use firestarter as a DHCP generator since I used my desktop as PXE-server.

# DHCP configuration generated by Firestarter ddns-update-style interim; ignore client-updates; authoritative;

subnet 192.168.66.0 netmask 255.255.255.0 { option routers 192.168.66.9; option subnet-mask 255.255.255.0; option domain-name-servers 130.67.60.68, 193.213.112.4; option ip-forwarding off; range dynamic-bootp 192.168.66.10 192.168.66.20; default-lease-time 21600; max-lease-time 43200; next-server 192.168.66.9; # important for PXE filename "pxelinux.0"; # important for PXE }

After the DHCP change we must restart DHCP
sudo /etc/init.d/dhcp3 restart

You should now be able to boot PXE of this machine.