Sandeep Neupane

Lately there has been tales of burglars walking around in my community. They make their way into homes and steal whatever they could find. Hearing this, I thought I should develop a security system that would atleast alert people of intruders into their houses. The following are the things I used : 1. Arduino UNO 2. PIR sensor 3. Electric Buzzer 5V 4. 100 Ohm resistor The circuit is pretty simple. The PIR sensor has three pins, Vin, GND and Vout. I connected the GND and Vin to GND and 5V respectively of Arduino. I connected Vout to pin 2. Electric Buzzer has two pins Vin and ground that were connected to pin 10 and GND respectively. The buzzer heated up pretty fast so I connected 100 Ohm resistance between the ground and Arduino GND pins. I found a code here  that works with the setup I made. I uploaded it to the Arduino and tested it at different distances. I fixed it along the wall of the main hallway at the height of 5 ft to ensure its accuracy. Our code initi

Lately i decided that I don't want my laptop running at all times for trivial tasks, like downloading files, checking mail and so on. Also I had to constantly move files around from my laptop to desktop to mobile phone whenever I needed something. Having a NAS(Network Attached Storage) would solve that issue by keeping all my files in one place. So, I decided to make a home server using my Raspbery Pi 3 that would cater to my needs. The process is pretty simple. 1. Install Raspbian. Lite will do. 2. Setup Raspbian with ssh and auto login enabled. 3. Setup Samba server. Installing Raspbian on a Memory Card is pretty straightforward. First using a card reader to connect it with laptop USB. Check device name using df -h . It is usually mounted as /dev/sdb, or /dev/sdb1, /dev/sdb2, ... if you have multiple partitions. Unmount every one of them with umount /dev/sdb . Then I extract the downloaded file to obtain an .img image file. Use of dd command as follows: dd bs=4M if

Yes, it sounds a bit unorthodox. But I wanna point out that I am not discouraging you playing around with your phone's features. Yes, it unlocks a ton of features. But with great power comes great responsibilities. Whenever someone asks me to help them root their phone, I first ask them why specifically then want to root their phones. If I don't get a convincing answer, I don't help them and advise them not to do it. Because rooting phone exposes phone to a lot of security risks that weren't previously there. I want to talk about one specific one that I have personal experience with. So, recently I had my phone rooted, pretty standard procedure. Nothing out of the ordinary. I also installed a terminal emulator from the app store. I liked to browse around the filesystem in my phone. Looking at directories and comparing them with my laptop's Linux machine. And then I saw this line of command somewhere in the internet. rm -rf / Yeah, it looks bad. I g