Show Posts
Pages: [1]
1  Development / Other Hardware Development / Re: Keenduino board (Arduino clone) on: September 17, 2012, 06:09:05 am
Hello pico, thank you for your feedback :-)

yep, it's a very good idea to offer also a basic design, it would give newcommers a better understanding of what is essential for an arduino board.
There are plans for an ICSP port (because it is simply a must have). but sadly i didn't had the time to add it, but it is planned for the first update.

my plan is to make a pinout for the attiny2313 too and connect both to the ICSP port, so you have the abillity to reprogram both MCU's.
2  Development / Other Hardware Development / Keenduino board (Arduino clone) on: September 17, 2012, 04:27:10 am

I've designed an Arduino compatible board that can be easily build with throught hole components. It uses an modyfied version of avr-cdc.

- Can run at 5V or 3,3V (selectable with a switch).
- jumper for driving it competely over USB.
- uses avr-cdc for USB to TTL (modified version that gives you autoreset).
- uses an attiny2313 (avr-cdc) and an atmega328p (optiboot).
- runs with 19200 baud.

It is currently work in progress, but i would like to get some constructive feedbacks from you :-) 

You can find the current state of the project on my Blog:

I'm happy to see some comments :-)
3  Development / Other Hardware Development / Re: 328p @ 16MHz and 3.3V? on: September 17, 2012, 04:17:46 am
ATmega's are overclocking-friendly, the undervolting of 0,3V should be no problem. I made some tests with that setting and all of these passed without problems. But make sure that you run your board under the worst case temp specs of atmel.
4  Community / Exhibition / Gallery / Re: 5x5x5 LED cube on: April 20, 2012, 03:36:28 am
i have extended my led cube with an electret mic + an lm386 opamp to have some env response

here are my first results (there are still some noise issues i have to fix)

there is also a tiny description with some project details and ressources on my blog:
5  Community / Exhibition / Gallery / Re: 5x5x5 LED cube on: March 18, 2012, 04:57:42 am
Wow - Taking it a step further if there were 1000 x1000 x1000 and they were RGB LED's then you could make a three dimensional image !
Inside a crystal ball or like looking into a fish tank

... ... WHAT??? smiley

you can get very good results with a size of 16x16x16. 1000 x1000 x1000 ( LEDs) is a bit too expensive (for me).
there are a few vids on youtube showing some very big LED displays.

thanks for your reply smiley
6  Community / Exhibition / Gallery / 5x5x5 LED cube on: March 16, 2012, 05:54:36 am
here is my Arduino based 5x5x5 LED Cube.

it uses 5 3-8 bitdecoder chips to control the LEDs.
the Arduino Board uses a PL2323 For USB to Serial. I recycled it from an old data cable for a mobile phone.

7  Community / Exhibition / Gallery / Re: poor man`s Arduino project on: February 09, 2012, 09:22:58 am
small update about my bluetooth plan:

after studying a lot of specs and sourcecode for the implemetation of software USB host controllers and bluetooth statcks i`m sorry to say that i don`t see any possible way to talk to an USB BT Dongle with any cheap MCU that comes without hardware USB support. It is still possible to have a working USB host implementation for a attiny45/2313 (or any comparable chip), but due to the  limited ressources, you can only handle low speed devices (HID class devices for example). The minimal requirement for a normal BT dongle is full speed USB. I have ordered an BTM-222 to let my Arduino talk to an android phone.

while the bTM-222 is still very cheap (~12€), it hurts a little bit because it will double the costs for some of my planned projects :/

so what comes next? smiley

 - build an 5x5x5 LED cube
 - post an howto for the BTM-222 module
 - code an USB host for the tiny45
8  Community / Exhibition / Gallery / Re: poor man`s Arduino project on: February 07, 2012, 03:14:43 pm
thank you smiley

i used an attiny85 with the avr-cdc firmware smiley

you can take a look at my documentation:
its not finished yet, i have to fix a lot of typos and translation errors. i also want to rework the schematic (this was my first one)

currently i work on an lowcost bluetooth extension (wich is a lot harder than the USB solution) if i get this working then you can use an attiny26 as USB host interface to communicate with one of this cheap bluetooth dongles. but this project is currently in a theoretical state and iam also not sure if this is possible with such a small chip. 
9  Community / Exhibition / Gallery / poor man`s Arduino project on: February 06, 2012, 08:18:45 am

selfmade lowcost Arduino with USB

10  Topics / Education and Teaching / yet another DIY Arduino (with avr-cdc) :) on: February 05, 2012, 04:41:14 am
hi there.

i have written a little blog post about my very first selfmade circuit. its an arduino based on a atmega328.. it uses a little bootloader tweak to work with the avr-cdc project. feel free to post your ideas, corrections and improvements about this little project smiley-wink

EDIT: I have made a short demovid

Pages: [1]