AVR Fuse-Bit Fixer [Gallery]

The Doctor to my AVRs, introducing the AVR Fuse-bit Fixer / Resetter.

This is actually a High Voltage Parallel Programmer and High Voltage Serial Programmer built into one circuit with code to automatically reset any AVR connected to its terminals to factory settings.

Details of AVR Fuse-Bit Fixer

Dual Power Supply [Gallery]

In first year of engineering, we were taught about rectification of ac signal by diode and how to make a simple power supply using step-down transformer for decreasing the voltage level of mains, diode for rectification, capcitors for filtering and voltage regulators at the end to regulate the voltage to some proper level.

Until I write a proper post for the Power Supply project,  here is a gallery of the project; enjoy..!

Tachtastic – AVR Tachometer

Tachtastic - an Image from the old days..

“Tachtastic”, a not so creative name for a tachometer. I was in my 2nd year of BE at the time and making a Tachometer seemed like a good idea and an easy project (according to a senior).

For those who don’t know, a tachometer is a device which can count the number of revolutions/rotations of something by use of some sensing mechanism. The sensing mechanism may or may not touch the device whose rotation is being measured. [Here is the Wikipedia Page for Tachometer]

I wanted to make a portable Tachometer which could run on a 9V battery and be small enough to fit in a pocket, yet be versatile to support multiple types of sensors and other basic functionality found in consumer tachometers.

Tachtastic – AVR Based Tachometer [Image Gallery]

Continue reading Tachtastic – AVR Tachometer

Selection Menu for Text LCD [AVR]


An option-selectable-menu on a text LCD using an AVR is not such a big deal, but having it sure saves a lot of time as such a menu can be quite helpful and useful in many projects. Here’s a video of the simulation:

I first made the menu for my AVR Tacho-meter project (AVR Tachometer [Gallery]) that I named Tachtastic…. The menu serves basic functionality like dynamic options (not to be changed on run-time), simple item selection via external input (next/prev button and select/back button), easyily implementable sub-menus (treated as separate menus which show up on a specific menu item selection)

I used the LCD library of Peter Fluery, the hardware in the project attached uses LCD with 2 lines so some changes will be needed if you have 2+line LCD, there are 4 external push-to-make buttons for prev/next and select/back.

The code is well-commented and self-explanatory, so I won’t be putting that up here, the project uses my template.h file (included in the download), the code might seem hard-wired at some places but easily modified. I have already used the same code with small changes in a other projects. So, I am putting all the stuff here, maybe someone will benefit or tell me how I can improve.

Software Used:

  • AVR Studio with WINAVR (AVR GCC)
  • Proteus for Simulation
  • LCD Interface Library from Peter Fleury (http://www.jump.to/fleury)
[Download not found]

L297-L298 Stepper Driver – Vero-Board [Gallery]

Another day, a cricket match which the whole nation is watching and I just finished making a circuit, on vero-board.

L297 and L298 make a perfect pair for a stepper motor driver circuit, like the two were made for each other (actually they really are made as a pair, I think…).

As usual, I wanted to make it work, look nice and be compact at the same time, the final result says that I somehow reached my goal, the motors are working, the circuit is small and looks just cool enough.

I will put up some explanation for the circuit when I get time someday, until then, check these links for some explanation: L297+L298