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Showing posts from May, 2007

How to setup 2FA On Linux SSH Login

  This is a simple setup guide to enabling Two Factor Authentication (2FA) on Linux SSH login. I this article I wont go deep into setup and issues that I have faced when implementing this. First thing is first Update your system first. I have used Ubuntu 20.04 and it is always up to date. To enable 2FA you need to install google authenticator modules sudo apt install libpam-google-authenticator Configuration for PAM and SSHD Add the the following line to /etc/pam.d/sshd and After adding this line please restart the sshd services.  auth required pam_google_authenticator.so Go to /etc/ssh/sshd_config and check if the following line exist. Default value will be "no" so change it to "yes" to activate.  ChallengeResponseAuthentication yes Configuration for Authenticator In the terminal run google authenticator command It will ask few things to acknowledge by user. Details you can see from the below video. Once this part is done you are ready to use the 2FA in ubuntu. T
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Voltmeter completed

Long time back i have posted on regarding a voltmeter. I know it took long time to complete it. But this completion is quit modified from my older design. I used an PIC16F88 which has 7 ADC channels .Keke i used only one at the moment. But have many thoughts for an upgrade sometime later. Everyone will think how this fella works. How it works? The circuit was design for two different parts. One is Analog side and other one is Digital side. Analog side does all the voltage conversion part for the micro controller. This was done by an LM358 which is an Operational amplifier, otherwise known as Op-Amp. Huge value of voltage will damage the micro controller. The input voltage for Micro controller should not exceed 5V so this part is handle by the analog circuit. Next is digital part which is the micro controller part which does all computing and display the result. This circuit is complicated for a newbie cause i used shift registers to handle the 7 segment displays. Micro controller outpu
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Compornents.

Finally i cleared my stuffs and i took some pic's just for starters who may wondering what are components. I brought resistors, IR Led, Op amps and surface mount IC's for my projects. So if any one interested to get components, let me know.
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Stock arrived

Today i received my new electronic components stock and sad part is still i haven't seen it. Tomorrow will go to fetch it. If anyone want to buy any electronics component let me know. Cutz for now
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Cut down the shift code

The shift register code i used before has been cut down to ten lines. This was done when i was trying the infrared thing. This is a great success for me for sure...;). I am still working on the infrared project and waiting for my new stock of components to be arrived end of this month. If any one wants to get any component let me know. For now i am going to feed some processors.
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Infrared(Invisible light)

These days i am trying some experiments with infrared lights. Its not visible to naked eyes and normally uses a camera to see the light. If you want to try that, get an infrared LED and power it up and use a web cam or any type of camera to see it. This is interesting thing. I use infrared to make a remote control. RX and TX side will have a micro controller. TX will send date to RX and RX will do the rest. Now the TX part is totally completed by experimenting, still RX side experiments are going on. cause i need to make the code looks nice and short. Once this is finished you guys can have a try... ;)
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