My first working microcontroller

[BarsMonster]

http://www.youtube.com/watch?v=KX-XPR-qsLc

atmega48 driving few leds leds with 2 PWM channels using sin from a contant table to slowly turn off/on leds with different frequency. Coding is done on C with CodeVisionAVR. I had no resisters at the moment of making this, so all resistors are drawn using usual pencil

[Frama]

How long did you take to do this?

*An other question I am curious about. How did you program it? Quite with CodeVisionAVR as you said I suppose. But how did you actually connect the chip with your computer in order to transfer the code?

[BarsMonster]

How long did you take to do this?

*An other question I am curious about. How did you program it? Quite with CodeVisionAVR as you said I suppose. But how did you actually connect the chip with your computer in order to transfer the code?

About 10 minutes to draw PCB using permanent marker, 30 minutes to etch it, soldering took like 30 minutes before I get used how to handle there SMD leds - they appeared to be extremely fragile (damaged 2 during soldering). Programming took like 10 minutes.

In order to flash it I had to make a simplest COM-based programmer - 2 diodes and few resistors and that's it. I have to connect it to old PC.
It took like hour more. Next goal is to build USB programmer using software USB stack, so that I can use just my main PC for that.

[Frama]

Thanks.
May I dare ask another question?

Can you show me exactly what kind of serial port do you use to actually connect the chip with your computer. I mean what does it look like? I suppose there is some kind of connector in the "motherboard". I guess you don't just have to plug the to a serial port with some tape

I hope I don't bore you with my stupid questions...

[BarsMonster]

Thanks.
May I dare ask another question?

Can you show me exactly what kind of serial port do you use to actually connect the chip with your computer. I mean what does it look like? I suppose there is some kind of connector in the "motherboard". I guess you don't just have to plug the to a serial port with some tape

I hope I don't bore you with my stupid questions...

Yes, I was using standard COM-port connector, bought it for like 1$ on the market.
Here it goes before etching and final form

[Frama]

Once again, thank you very much.
It's not very common to see that kind of stuff. Even on the Internetz

[BarsMonster]

Hehe, more complex stuff



Display showing debug info. Microcontroller connected to USB, and works like a USB keyboard (simulating some numbers printing)

[BarsMonster]

Another just-debugged piece of hardware:


Here are:
* USBASP Atmel AVR microcontroller programmer working via USB
* 3.3v power supply (in additional to default 5v supply)
* Additional 1.25 - 2.5v power supply
* Low frequency generator (2Hz - 1.5Mhz)
* High frequency generator (4kHz - 80Mhz)
* Logic "analyzer" (shows current state on a probe + pulse counter from 2 to 2^32 - so that one can visually measure frequency and see activity)

[HI_VOL]

Wow, nice! Now teach it to crack MD5
How did you manage it to get a good working PCB? I want to make something like that too... But atm im forced to my "Allgemeine Grundausbildung" at the German army -.-
However, i want to make a little Fan-Controller that can be controlled via Speedfan... but this is a huge project

*Thumbs Up*

[BarsMonster]

Wow, nice! Now teach it to crack MD5

lol

How did you manage it to get a good working PCB? I want to make something like that too...

Well, this appeared easier than I've thought.
I had alot of pain with UV-sensetive spray, but then I tried laser-printer method, and it worked fine from the very first time.

However, i want to make a little Fan-Controller that can be controlled via Speedfan... but this is a huge project

Not sure it's easy to do something controllable from SpeedFan...