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Topics - michu

7
Project development, ideas, and suggestions / ExpeditInvaders, a glowing shelf you can control with your f
Hey guys

I just finished my project "ExpeditInvaders", a spiced up Ikea shelf! I added 40 LED modules to it and glued a keyboard on the bottom of the shelf. Now I can change the colorset or animation with my foot!

Links:
Blog entry: http://neophob.com/2012/08/expeditinvad ... kea-shelf/
Flicker: http://www.flickr.com/photos/pixelinvad ... 988401736/
GitHub: https://github.com/neophob/ExpeditInvaders

I hope you guys like it, if you have questions I'm glad to answer them.

Cheers
Michu
8
Project development, ideas, and suggestions / Dead simple input device
hey all

I'm working on a new Arduino project and looking for a simple, cheap and reliable input "device". I found some solutions, but not the ultimative solution. Here's my list:

Native Capacitive Sensors without additional Hardware: http://arduino.cc/playground/Code/CapacitiveSensor
Capacitive Sensing Library: http://arduino.cc/playground/Main/CapSense
Pro: very easy, Con: Not reliable if Arduino is not Grounded, ESD (fry the Arduino?)

PS2 Scroll Wheel Mouse: http://thepotterproject.net/TPPNews/?page_id=180
Pro: easy, nice control, Con: looks ugly

Push Button and Arduino internal Pullup Resistor: http://sheepdogguides.com/arduino/aht0button.htm
Pro: also easy Con: needs Push Buttons/Hardware case

Does someone else knows some more easy input devices?
10
CPLD programmable logic / Now what?
Hey guys

I just bought a XC2C64A CoolRunner-II CPLD development board, now what? What did you guys use this CPLD for?

I never worked with one, so I'm curious.

What I want to do is to create a kind of buffer chip for a spi/i2c signal (software schmitt trigger?), what do you think, is this possible? or completely the wrong approach?

cheers
michu
11
General discussion / SPI Signal, long cable and some questions
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
12
Project logs / Arduino Led Strip and more
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
13
Bus Pirate Support / Use BusPirate to upload sketches to an Arduino Ethernet
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?
14
Project logs / Huge Led Pixel Matrix
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
15
General discussion / usb to spi - which hardware to use
hey guys

I need some help, I want to drive some led stripes with a spi interface. I want to use data from a tool i wrote and send it via serial port to the leds.

Until now I used an Arduino, BUT there is an issue about the serial communication, it need arround 20-30ms to send 130bytes to the Arduino and get a reply - which is too much as I you want to drive multiple led stripes.

So my question is, what is the "best" solution to convert data from the usb bus to an spi signal? Best means, low latency (time to send the data should be arrounf 1ms) and 30kb/s throughput. Some candidates:
* teensy: similar to an arduino but much better usb serial handling (for my purpose)
* Leaf Maple (Cortex M3): don't know that board really, but it looks like it could handling that kind of stuff.
* FT2232H USB 2.0 Hi-Speed breakout board
* NXP mbed (LPC1768)

thanks for any hints!
cheers
michu

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