Last semester I had to pick a project for my embedded systems and micro controllers labs. First thing that came to my mind was led tachometer for lfs. So it's a "led tachometer for simracing made with Atmega8535, 12 leds, and max232 for rs232 communication."

I had no experience with micro controllers (apart from programming them at university), soldering etc, so the goal was to produce my project as simply as I could. This thread is for people who don't have experience with micro controllers, like I didn't, but who would like to make some outgauge lfs device.

I'm sharing everything that is needed to construct it:
- Scheme.
- parts info,
- data sheets,
- micro controller c program and hex file,
- dll api for communication with tachometer,
- sample lfs outgauge app, which synchronizes lfs revs with tachometer. I am using LFS External library for outgauge.

Things you need:
- Free time,
- com port in pc,
- soldering tools,
- programmer for avr (can buy one cheap, or make one yourself),
- parts, which are freely available.

Tachometer functionality:
- It lights up as many leds as user wants - send 4 to light up 4 leds, 5 to light up 5 leds etc.
- It has 3 modes:
* leds light up from left to right
* leds light up from right to left
* leds light up to the center

Also it can be easily extended, for example 7 segment displays can be added etc.

Video Presentation
Video Presentation BF1

The way I soldered it is not very ergonomic, as my first goal was to make it work. It can be soldered much better, for example with a custom made circuit board and proper placement of ports.

google code page with source code, data sheets etc:
http://code.google.com/p/led-tachometer-microcontroller/
http://code.google.com/p/led-t ... /source/browse/#svn/trunk

scheme:

bigger: http://img409.imageshack.us/img409/9914/schematics.png

nice page about avr micro controllers: http://www.tuxgraphics.org/electronics/

Enjoy and have fun.

Looks very interesting, well done
Can you give some more info/link about programming of avr.
Something like this DIY avr programmer will do the job?

Thanks.

About the programmer. That and many more solutions should work. For example: http://www.lancos.com/prog.html

If you will be using a programmer that works with avrdude then I also recommend this: http://www.khazama.com/project/programmer/

Also just upload the hex file to the atmega. Fusebits don't need to be changed.

If you would like to change avr program and test it in simulator then also download avr studio.

p.s.: I used this: http://www.sklep.nestor-electr ... wka_kabelek,458083,3.html

hey

do u know how can send data via USB to a AVR uC??
i have search on the internet but i really dont know what i looking for.
and i need this for my current schoolproject.

I have some pages bookmarked, maybe they will help:

http://www.cesko.host.sk/IgorP ... rPlug-USB%20(AVR)_eng.htm
http://www.cesko.host.sk/IgorP ... B%20(AVR)%20RS232_eng.htm
http://www.xs4all.nl/~dicks/avr/usbtiny/index.html

And there are some projects that use usb on this page: http://www.tuxgraphics.org/electronics/

Also check ft232.

thx mate

i have download the datasheet of the FT232Rl IC.
and i think ill gonna use that in our next schoolproject.