How to change static IP-number on a Cent OS 6 machine

How To Configure Static IP On CentOS 6
=======================================

## Configure eth0
#
# vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=”eth0″
NM_CONTROLLED=”yes”
ONBOOT=yes
HWADDR=A4:BA:DB:37:F1:04
TYPE=Ethernet
BOOTPROTO=static
NAME=”System eth0″
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
IPADDR=192.168.1.44
NETMASK=255.255.255.0

 

## Configure Default Gateway
#
# vi /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=centos6
GATEWAY=192.168.1.1

 

## Restart Network Interface
#

/etc/init.d/network restart

## Configure DNS Server
#
# vi /etc/resolv.conf

nameserver 8.8.8.8 # Replace with your nameserver ip
nameserver 192.168.1.1 # Replace with your nameserver ip

Set up Wifi on your Raspberry Pi without a monitor

If you like to setup Wifi on your Raspberry Pi without a monitor you can after write the image to the SD card.

On my Windows machine after running Raspberry Pi Imager i needed to remove the sd card and add it again to the usb port to see the drive named boot.

In that drive you create a text file named wpa_supplicant.conf and adding this lines in it:

country=US # Your 2-digit country code
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
network={
  ssid=”YOUR_NETWORK_NAME”
  psk=”YOUR_PASSWORD”
  key_mgmt=WPA-PSK
}

After saved this file with your SSID and password for your Wifi this should connect on first boot to your network.

If you running a Raspberry Pi Zero Wireless you can only connect to a 2.4Ghz network, so you know. The normal ones seems to have 5Ghz but not sure from what version.

 

Reset Windows 10 offline user password

If you forgot your Windows 10 Offline user password you can reset the password by using a windows 10 installation USB stick and some simple hacks.

Good to know is that all the users encrypted saved passwords being reseted so you going to be needed to login again on all applications.

Start with setup a Windows 10 installation USB-memorystick so you can boot on it.

Boot on the USB and when the first prompt for the Windows installation shows, where you select langauge and keyboard layout and time and currcency format press SHIFT + F10 to open a command prompt.

Now we need to replace utilman.exe with cmd.exe, before you do this, you should make acopy of utilman.exe so that you can restore it later. Note that you can only restore this file if you boot again from the Windows DVD. Windows 10 is usually installed on drive D: if you boot from a DVD. You can verify this with “dir d:\windows\system32\utilman.exe.” If the system can’t find utilman.exe, try other drive letters.

move d:\windows\system32\utilman.exe d:\windows\system32\utilman.exe.bak
copy d:\windows\system32\cmd.exe d:\windows\system32\utilman.exe
 
After you replaced utilman.exe successfully, you can restart your computer by type:
 
wpeutil reboot
 
When you get to the Windows 10 sign in page, click the Utility Manager icon and the Commpand Prompt opens.
 
You can now add reset your account password with the below command:
 
net user <username> <password>
 
After run the above command you can now close the command prompt and login on your account with the new password.
 
Notice that resetting a password with this command doesn’t work with a Microsoft account. The only way to reset a Microsoft account password is through the online forms.

First test of WeMos D1 mini Pro with 1-wire temperature sensor DS18S20

I was looking into how to make a small cost wifi temperature sensor and i find WeMos D1 mini Pro as a very little arduino with wifi on it.

So i buy two of them + two 1-wire temperature sensors DS18S20 and starting read about and after a while testing i got the temperature sensor to work.

The code i used to get the temperature sensor values was:
#include <OneWire.h>

// OneWire DS18S20, DS18B20, DS1822 Temperature Example

OneWire ds(D4); // on pin D4 (a 4.7K resistor is necessary)

void setup(void)
{
Serial.begin(9600);
}

void loop(void)
{
byte i;
byte present = 0;
byte type_s;
byte data[12];
byte addr[8];
float celsius, fahrenheit;

if ( !ds.search(addr))
{
ds.reset_search();
delay(250);
return;
}


if (OneWire::crc8(addr, 7) != addr[7])
{
Serial.println("CRC is not valid!");
return;
}
Serial.println();

// the first ROM byte indicates which chip
switch (addr[0])
{
case 0x10:
type_s = 1;
break;
case 0x28:
type_s = 0;
break;
case 0x22:
type_s = 0;
break;
default:
Serial.println("Device is not a DS18x20 family device.");
return;
}

ds.reset();
ds.select(addr);
ds.write(0x44, 1); // start conversion, with parasite power on at the end
delay(1000);
present = ds.reset();
ds.select(addr);
ds.write(0xBE); // Read Scratchpad

for ( i = 0; i < 9; i++)
{
data[i] = ds.read();
}

// Convert the data to actual temperature
int16_t raw = (data[1] << 8) | data[0];
if (type_s) {
raw = raw << 3; // 9 bit resolution default
if (data[7] == 0x10)
{
raw = (raw & 0xFFF0) + 12 - data[6];
}
}
else
{
byte cfg = (data[4] & 0x60);
if (cfg == 0x00) raw = raw & ~7; // 9 bit resolution, 93.75 ms
else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms

}

celsius = (float)raw / 16.0;

Serial.print(" Temperature = ");
Serial.print(celsius);
Serial.print(" Celsius ");

}

Disable Raspbian to get black screen after 10 minutes

So when i was setup a Raspberry Pi on a TV to show a webpage i find that Raspbian haved some kind of timeout that was making the TV to go dark after 10 minutes.

After a while searching i find that there is differents way to fix this in differnt versions but i run Raspbian Buster in the beginning of february 2020 and i tested a lot of things before i got it to not be black screen after 10 minutes.

To fix this you need to edit the file named /etc/xdg/lxsession/LXDE-pi/autostart with your chose of text editor and i change it to look like:

@lxpanel --profile LXDE-pi
@pcmanfm --desktop --profile LXDE-pi
@xset s noblank
@xset -dpms s off

The two first lines is default lines to get the desktop to start but the last two is to disable the black screen that shows up after 10 minutes.

In the default file there is a line about xscreensaver that i removed.

Reboot the Raspberry Pi and wait and now i should not be black screen anymore.

Raspberry Pi – Show website in fullscreen on TV

A client was like to show some images on a TV and i try to find a good solution with Raspberry Pi and after tested some i selected to go with setup a Raspberry Pi with Raspbian open up a Chromium webbrowser in fullscreen mode on startup.

This sounds easy but there was a couple of things i find out on the way to get a stable and working version of this project.

The webpage i built my self and not going to include in this post i only whant to write down what i find around Raspbian and the setup to get all stable.

Here is the different steps to setup Raspbian right:

1. Wifi setup

I used a Raspberry Pi 3 B+ with built in wifi but to get it up on the wifi without any keyboard i configure the wifi setup on the SD-Card.

Read my old post about this here.

2. Enable SSH

Read my old post about this here.

3. Clean up Raspbian

The non-lite version of Raspbian comes with quite a few things that are not needed for a Kiosk-style display which bloat the install.

They can be removed, after which an autoremove will take care of any dangling dependencies:

sudo apt-get remove --purge wolfram-engine scratch nuscratch sonic-pi idle3 smartsim java-common minecraft-pi python-minecraftpi python3-minecraftpi libreoffice python3-thonny geany claws-mail bluej greenfoot

sudo apt-get autoremove

4. Ensure everything is up-to-date

Run this commands to make sure your raspbian is up-to-date:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

5. Install Chrome and unclutter

We need chromium-browser as well as unclutter (to hide the cursor).

sudo apt-get install unclutter chromium-browser

6. Automatically start Chrome and disable black screen shows up after 10 minutes

Change the file ~/.config/lxsession/LXDE-pi/autostart to look like:.

@lxpanel --profile LXDE-pi
@pcmanfm --desktop --profile LXDE-pi
@xset s noblank
@xset -dpms s off

@sed -i 's/"exited_cleanly": false/"exited_cleanly": true/' ~/.config/chromium-browser Default/Preferences
@chromium-browser --noerrdialogs --kiosk http://www.google.com --incognito --disable-translate

The first 2 lines is to get the desktop to start.

The 3th and 4th line is to disable black screen after 10 minutes

The 5th line is to ensures chromium thinks it shut down cleaning, even if it didn’t to prevent tab restore warnings.

The 6th line is to start the chromium webbrowser and to set wish URL Chromium should show.

7. How to disable “Translate page”-dialog

I write in the beginning of this post that i dont going to get in to the page i was showing but there is a tip i like to give, i was getting a “Translate page”-dialog everytime i rebooted the Raspberry Pi.

The only way i find that worked for me was to add a meta tag in the html code to disable it:

<meta name="google" content="notranslate">

Now we are done

Now you have a working Raspberry Pi that on startup shows a website in chromium full screen (kiosk mode).

Reboot the raspberry pi and let it run.

 

Auto run on Scum and other games

After started playing Scum i was looking for autorun function and didnt find any in the game so i start reasearch and find a software called AutoHotKey that you can make a script file doing macros.

So i look in to it and write this this script that makes when i press one of my mouse side buttons its hold in W and when i click again its stop holding it.

All you need is to download and install AutoHotKey and create a file on example the desktop called “Press W toggle.ahk” or what you like it the have.

And open the file in example notepad and paste in this code:

XButton1::
If GetKeyState("w")
Send {w Up}
else
Send {w Down}
Return

And save the file, every time you go in to the game double click on that file and its shows a green icon with the clock with a white H on it, then its running the script.

Then go in to the game and when you like to auto go or run press the mouse side mouse button.

What you need to know is that you can not alt+tab out to other windows becouse then it stops and start write W on the place you put your mouse marker.w

VMware ESXi 6.0 and PCI Express S-ATA card that not are supported

I have put together my old file server hard disks to my old computer and put together a good server where i install VMware ESXi 6.0 and it didnt find my disk i haved plugged in on the PCI Express S-ATA card.

After some searching i find someone that make it possible to install som unsupported stuff to get the PCI Express S-ATA card to work with this commands below and a restart all worked good.

esxcli software acceptance set --level=CommunitySupported

esxcli network firewall ruleset set -e true -r httpClient

esxcli software vib install -d http://vibsdepot.v-front.de -n sata-xahci

Install Domoticz on Raspberry Pi 2 Model B

  • Install latest Raspbian on a micro sd card
  • Enable SSH by put a file named ssh without any file extension in the boot partition on the micro sd card, content has no matter.
  • Startup the Raspberry PI and connect to SSH
  • Install Domoticz by running the following command: sudo curl -L install.domoticz.com | bash

For some reason i didnt get Domoticz to work after this i got some error when trying to run ./domoticz about libssl so i search and search on google and find that i needed to make this stuff:

  • Run this commands to update Raspbian packages: sudo apt-get update && sudo apt-get upgrade
  • Update Domoticz to latest beta with this commands: /home/pi/domoticz/updatebeta
  • Open webbrowser on the raspberry pi ip number and port 8080 and start configure Domoticz

 

The Things Network – A Global IoT network

Me and my friend Christoffer has looking into some Internet Of Things stuff and one of the biggest problems with get “things” on to the internet is that its cost many and battery.

Now we find a way to do it sheep and battery low using, with the community driving “The Things Network”.

Together a community of people all around the globe building gateways and letting people connect to there gateways to send small amount of data to the the network.

All data is encrypted so the gateway owner only seeing package of data delivered but not what it sent.

I was the first person in Nyköping to put up a gateway for this “The Things Network” using a Pycom LoPy unit that talks LoraWan, Wifi and Bluetooth.

The Things Network using LoraWan to talks to units, in Europe with a frquency of 868 MHz and the gateway also connects to the wifi to get conenct to internet and the network.

Then i have a another Pycom Lopy i setup as a node and have going around the apartment and scanning of how long the conneciton works. Really good i most say, here is a signal map:

The next step in ths project is to make the node sendning out events from a magnetic sensor that i like to add on my door to know when the door opens and closes and maybe another sensor on the mail inbox.

On tip, after follow the “Get started” tutorials and the node don´t like to join the network but the node is conencted tot he gateway and only sending  activating requests.

Then open up the port 1700 with both TCP and UDP to the gateway ip-number.