Show Posts - michu

This section allows you to view all Messages made by this member. Note that you can only see Messages made in areas you currently have access to.

Messages - michu

General discussion / SPI Signal, long cable and some questions

March 15, 2012, 12:56:06 pm

Hey guys

I work on a led project and i'm really stuck! The main issue is, that i use a spi signal over a long distance. I'm not a electrical engineer an that's why I'm asking the community for some hints. To get help, I wrote my problem down as detailed as possible:

http://neophob.com/2012/03/lpd6803-spi- ... -distance/

It would be great if someone could take a look at this topic and give me some feedback, concreate to those questions:

-what kind of Impedance resistor (between gnd and clk) would you use?
-what kind of capacitor the clean out DC would you use?
-did I forget something important?
-other hints....

cheers
michu

General discussion / Re: I just bought this, and you what did you buy ?

February 03, 2012, 09:09:21 pm

I just bought a StripInvaders DIY Kit - I published this opensource project, now I can buy it...

Project logs / Re: Arduino Led Strip and more

February 03, 2012, 08:39:10 pm

I just posted a video, how to assemble this project:
http://vimeo.com/35978973

and I also did a small writeup here: http://neophob.com/2012/01/stripinvader ... -assemble/

Project logs / Re: Arduino Led Strip and more

December 22, 2011, 09:51:53 am

Hmm the movie and images working fine for me.

the pictures with the fisheye were taken by using a gopro camera. while it was ok to take pictures, the video was unusable.

oh, and dhcp AND mdns/bonjour is the fancy stuff here, as the osc client software will "discover" your arduino without troubles! and some more pictures are available on my flickerpage at http://www.flickr.com/photos/pixelinvaders/.

cheers

Project logs / Arduino Led Strip and more

December 21, 2011, 09:05:08 pm

Hey all

I just released StripInvaders, my Arduino (Ethernet) based LED Strip (ws2801) driver. Some features:
-Bonjour and mDNS support
-DHCP support
-15 different color modes
-Control StripInvaders with a Smartphone or Tablet
-Stepless adjust the RGB value and the animation delay
-All fits into the 30kb firmware

I published the sources on https://github.com/neophob/StripInvaders. Images and a video can be found on my blog: http://neophob.com/2011/12/stripinvaders-light-system/.

cheers

Bus Pirate Support / Re: Use BusPirate to upload sketches to an Arduino Ethernet

December 07, 2011, 05:09:42 pm

Good catch Ian, thanks!

Well I guess I've a love-hate relation to my Arduino Ethernet. I just tried to connect a Seeedstudio Grove Shield to this board, ehich failed due "mechanical issues". Damn...

Bus Pirate Support / Re: Use BusPirate to upload sketches to an Arduino Ethernet

December 02, 2011, 10:05:11 am

ahh damn.. finally i got it! I was using the wrong pins, i wrote it down if you need an image: http://neophob.com/2011/12/use-buspirat ... -ethernet/

Bus Pirate Support / Use BusPirate to upload sketches to an Arduino Ethernet

December 02, 2011, 09:03:47 am

Hey guys

My Arduino Ethernet just arrived yesterday and my idea was to use my Buspirate to upload my sketches to it.

So I connected both boards together:
MISO -> RX
MOSI -> TX
CS -> Reset
GND -> GND
+5V -> 5V

and started my terminal:

Code: [Select]

HiZ>I
Bus Pirate v3
Firmware v4.2 Bootloader v4.1
DEVID:0x0447 REVID:0x3043 (B5)
http://dangerousprototypes.com
HiZ>W
No mode set, M for mode
HiZ>m
1. HiZ
2. 1-WIRE
3. UART
4. I2C
5. SPI
6. JTAG
7. RAW2WIRE
8. RAW3WIRE
9. PC KEYBOARD
10. LCD
(1) >3
Mode selected
Set serial port speed: (bps)
 1. 300
 2. 1200
 3. 2400
 4. 4800
 5. 9600
 6. 19200
 7. 38400
 8. 57600
 9. 115200
 10. 31250 (MIDI)
(1) >9
Data bits and parity:
 1. 8, NONE *default
 2. 8, EVEN
 3. 8, ODD
 4. 9, NONE
(1) >
Stop bits:
 1. 1 *default
 2. 2
(1) >
Receive polarity:
 1. Idle 1 *default
 2. Idle 0
(1) >
Select output type:
 1. Open drain (H=Hi-Z, L=GND)
 2. Normal (H=3.3V, L=GND)
(1) >
READY
UART>w
POWER SUPPLIES OFF
UART>W
POWER SUPPLIES ON
UART>(3)
UART bridge. Space continues, anything else exits.
Reset to exit.

Now I exit the terminal and switch to the Arduino 1.0 IDE, try to upload the simplest sketch possible:

Code: [Select]

void setup() {
  // put your setup code here, to run once:
}

void loop() {
  // put your main code here, to run repeatedly:  
}

well the upload process fail:

Code: [Select]

"C:_toolsarduino-1.0hardware/tools/avr/etc/avrdude.conf"

         Using Port                    : \.COM8
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: Send: 0 [30]   [20] 
avrdude: Send: 0 [30]   [20] 
avrdude: Send: 0 [30]   [20] 
avrdude: Recv: 
avrdude: stk500_getsync(): not in sync: resp=0x00

avrdude done.  Thank you.

any hints, what I'm doing wrong?

Project logs / Re: Huge Led Pixel Matrix

November 27, 2011, 09:29:04 am

Hey hak8or

Thanks, the modules are lpd6803 based, each module has 3 smd rgb led "onboard" and I sell them at http://pixelinvaders.ch/?page_id=208 if you're interested ;)

do you need more information?

cheers
michu

Edit: I just created a shopy entry with more details: http://pixelinvaders.ch/?page_id=390

Project logs / Re: Huge Led Pixel Matrix

November 25, 2011, 08:48:44 am

Thank you sir ;)

Project logs / Huge Led Pixel Matrix

November 24, 2011, 05:01:41 pm

Hey Guys

I'm working quite some time on my Huge Pixel Matrix Project called PixelInvaders (http://http://Pixelinvaders.ch). The Software PixelController is available on Github (http://https://github.com/neophob/PixelController).

The core of the Software is written in Java (and Processing), the frontend is written in Pure Data, thus I can use the OSC protocol. I just uploaded a new Video which shows my Android Tabled and the PixelInvaders Matrix in Action:

http://http://vimeo.com/32580251.

Cheers
michu

General discussion / Re: usb to spi - which hardware to use

February 09, 2011, 05:33:06 pm

wow, thanks guys for the detailed feedback. I guess I will use an Arduino as proof of concept device - then I'll see if the SPI bus if fast enough to drive 64/256/512 leds. If thats not the case, I'll check if I find a nice PIC board.

General discussion / Re: usb to spi - which hardware to use

February 08, 2011, 10:26:43 am

Thanks for your reply

As I switch from the rainbowduinos to the lpd6803 leds - there is no need for pwm - only spi is needed. the "new" led's (called intelligent pixels) handle all this stuff - they just need to feeded by an spi signal.

General discussion / Re: usb to spi - which hardware to use

February 07, 2011, 08:53:19 am

the current version use the rainbowduino from seeedstudio. I uses i2c to communicate between the boards (you can chain them together). however you need one foard for 64 (rgb) pixels and the pwm (4bit) is done in software - which is not optimal, for example if I receieve data from the i2c bus (which also uses interrupts and may distort the software pwm). I wrote my own firmware (called neorainbowduino) which is basically a triple pack :
- arduino firmware (act as serial to i2c convertor plus some tools like i2c scanner)
- rainbowduino formware: display the data on the led matrix using a software pwm, 12bit per pixel
- processing library, which handle the resizing of the frame, apply a gamma tab and sends out via serial port.

i put together a small collection of "neorainbowduinos in action" at http://www.neophob.com/2011/02/neorainb ... -the-wild/.

I entered the seeedstudio contest with two entries, one was a blinkenlights movie player (using my blinkenlights processing lib) and a space invaders generator using my own 80x80cm rgb led matrix.
cheers

General discussion / Re: usb to spi - which hardware to use

February 06, 2011, 10:43:42 pm

thanks for the detailed writeup.... as i'm tired of soldering 64 rgb leds by hand, I was looking for an alternative and will try those modules: http://www.aliexpress.com/fm-store/7017 ... 0-72W.html

As im not really a hardcore uC guy, I would prefer a device which is community supported and comes with some handy libraries. Just like the Arduino, but more powerfull..

( ! ) Fatal error: Uncaught exception 'Elk_Exception' with message 'Please try again. If you come back to this error screen, report the error to an administrator.' in /var/www/dangerousprototypes/forum/sources/database/Db-mysql.class.php on line 696
( ! ) Elk_Exception: Please try again. If you come back to this error screen, report the error to an administrator. in /var/www/dangerousprototypes/forum/sources/database/Db-mysql.class.php on line 696
Call Stack
#	Time	Memory	Function	Location
1	0.0157	2447560	session_write_close ( )	...(null):0
2	0.0160	2579176	ElkArte\sources\subs\SessionHandler\DatabaseHandler->write( )	...(null):0
3	0.0160	2579952	Database_MySQL->query( )	.../DatabaseHandler.php:119
4	0.0601	2718712	Database_MySQL->error( )	.../Db-mysql.class.php:273