Blog on Aabir Roy

Configuration of DS1374 RTC on Raspberry Pi CM4

Sat, 19 Apr 2025 00:00:00 +0000

What is an RTC?

A real-time clock (RTC) is used to keep accurate track of the current time and date, even when the main system power is turned off or the device is in a low-power state. A Raspberry Pi unlike many computers does not include a built in RTC. It relies on network time synchronization (NTP) to set the correct time after boot. This means when disconnected from the internet the Pi will not be able to maintain accurate time after a reboot or power cycle.

Cross-compiling the Raspberry Pi Linux kernel with the PREEMPT_RT patch

Wed, 22 Jan 2025 00:00:00 +0000

Compiling the Linux kernel on a Raspberry Pi is slow. This isn’t surprising considering the Raspberry Pi is meant to run custom kernels, rather than build them. A better approach would be to cross-compile the kernel on a more powerful x86 machine and then transfer it to the Pi. This saves a lot of time, time that you can spend actually using the Pi for your projects, instead of waiting for the kernel to build.

Sky Watch Array Network (SWAN)

Wed, 03 Jan 2024 00:00:00 +0000

The brainchild of Dr. Avinash Despande, the Indian Sky Watch Array Network aims to set up a group of radio telescopes across institutes in India, with the long-term goal of having a country wide radio interferometer which will help in the imaging of FRBs, pulsars and other astronomical sources.

It will significantly enchance Indian observing capabilities in the radio frequencies and also establish a sustainable approach to cultivate and support upcoming generations of skilled radio astronomers in India, enabling them to tackle challenges and spearhead compelling research in the field of radio astronomy.

Setup multiple git accounts on the same system

Fri, 20 Oct 2023 00:00:00 +0000

Git is an indispensible part of my workflow. I happen to use git for both my personal and work related projects. However, moving between these accounts can be challenging at times. In order to counter this, we can make use of a feature called conditional includes.

Setup ssh keys

To start with let’s set up the ssh keys for each of our accounts. Check for any existing ssh keys in the .ssh directory, and remove them if not in use.

Hello World

Wed, 11 Oct 2023 00:00:00 +0000

Hi there,

I recently turned 21, and decided to start a blog. I will be updating it, sharing insights into my current work and experiences.

I hope to learn to better communicate my thoughts and ideas and effectively convey them to an audience.

Thanks for stopping by!