Hardware Mode: Raspberry Pi Case & Solder Spool Stand.

In a previous post, I said that I got a Raspberry Pi – a very very impressive $25 (mine is the $35 version) single board computer. I’ve been spending the last few days just using it to get familiar with the OS. I use Debian on the Raspberry Pi which has differences when compared with Fedora (which I use on my desktop). One problem is that when you connect a few cables to the board, they start pulling it. This makes it hard to keep it  in one place and so a case is very necessary. After checking out a few ideas online, I made one myself.

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Table Follower Upgrade

Welcome back everyone! As promised, I’ve upgraded my table following robot. It took a little longer than I expected but it’s finally done.

The upgrades are mainly custom PCBs and a mechano chassis. A third unexpected upgrade is that I’ve used an Arduino board.

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The Simplest Line Follower – Upgraded! [Updated]

Hello everybody!

Apologies for not writing for so long! Work has kept me really busy so I wasn’t able to do much till now.

Last week I finally got time to do a bit of work. I made my own PCB :). I wish I had learned this back in college. It have would saved me so much time.  What PCBs did I make? The line follower circuit (Click me to open tutorial) I explained before. That design had two very irritating problems. Firstly the wires would keep breaking off and I would have to re-solder many times. Secondly, the cardboard mounts would keep bending.

The new robot uses very little wiring. None of the wires have been soldered. I have also replaced the mounts for the sensors. I will describe everything in today’s post. Read more of this post

Cookie the Table Following Robot – Tutorial

I’m back again for another tutorial on robots. This one will be on the table following robot of which a video was posted earlier. For those who haven’t seen it, here is the video again (Wish I had a larger table 😦 ):

Like it? Read more of this post

Micro-Servomotor Controller

This post was pending for a long time (So was the table follower. But we’ll look at it later). Here’s a simpler servo motor controller I made for a friend for his final year project. The controller was used to work with servomotors on a robotic hand.

Alright. Before I begin with the circuit and the program (yup its 8051 based 🙂 ), Here’s what it looks like:

The pic has just one servomotor in it. However this controller can handle a total of 5. Read more of this post

Coming Soon… A Table Following Robot

Introducing Cookie – the table following robot. I will be posting a tutorial on how to build one of these yourself. Keep checking!

Features to be added later:

  • Obstacle detection.
  • Manual Control

My aim is to build a robot that is remote controlled. However, if it encounters an obstacle or the edge of the surface on which it is moving, the robot takes control of itself and moves away from the obstacle or turns to avoid falling from the edge. However I will post on building just the table follower first.

The Simplest Line Follower [Updated]

Alright! First robotics project on the site :-)! This is a robot I made for a workshop, which I conducted under my college’s IEEE chapter. The robot is the simplest line follower you can make and I feel everyone who wants to start with robotics and does not know how to, should begin with this one. It does not need a microcontroller or any complex digital logic circuit. So you don’t have to worry about writing code in C and Assembly. You don’t need to worry too much about the design either. This robot is based on another line follower I had learned at a workshop (conducted at M. S. Ramaiah Institute of Technology, Bangalore). There is a difference of just one IC. The change was due to that fact that my robot uses 12V motors while their’s used 5V motors (with a gear system). Basic idea remains the same.
Note: If you are interested in a microcontroller based line follower I suggest checking this out http://www.kmitl.ac.th/~kswichit/LFrobot/LFrobot.htm
Before we begin. lets see the robot work!
Notice that the track is very simple. Read more of this post


Alright! I’ve finally finished with the Boolean Function Reducer – BoolCrunch. This is currently a beta. BoolCrunch can minimize Boolean functions and can give you either minterm or maxterm equations. I have written the program using Visual Basic 2008.


  • Supports both Sum of Products and Product of Sums expressions.
  • Allows functions with 1 – 10 variables.
  • Easy to use interface.

Screen Shots:

Low Cost IC Trainer Kit

Bugged by the kind of trainer kits we get in college, I decided to make my own digital circuit design lab. It basically required two main parts – an astable and a monostable multivibrator. This was needed to run sequential circuits. The rest of the circuitry is basically connections to output LEDs and a power supply for which I used an adapter available cheaply at any electrical shop. The base was made using switch boards. I feel a wooden board would be a better option though. Before telling you how you could make one for yourself, here’s what the kit I made looks like:

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