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projects:lichtwand [2019/03/12 23:28] – kratenkoprojects:lichtwand [2019/05/31 13:40] – rey
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-# Lichtwand +# RGB-Tetris-wall: 
-* [original planing page](rgb_tetris_wall)+ 
 +LED-based pixel wall for animations and tetris visualisation. Provides 16x24 RGB pixels on 80x120cm. LEDS are controlled with an Arduino, a Raspi provides input from arbitrary image or stream inputs including showing live Tetris games from NES input.
 * Github repo: https://github.com/deepestcyber/rgb-tetris-wall * Github repo: https://github.com/deepestcyber/rgb-tetris-wall
  
-# Abstract +|![](https://raw.githubusercontent.com/deepestcyber/rgb-tetris-wall/master/photos/result.png)| 
-Self-built LED-walls are a common sight since the Neopixel came along. We want one! Let's do it with style; it will be a pleasure to look upon and its lights shall shine brightly. The Lichtwand will also be able to stream the game of Tetris live from the original NES -- not just a simple reimplementation on the wall.+|---| 
 +|Complete RGB-Tetris-LED-Wall| 
 + 
 +## Hardware: 
 + 
 +- WS2811 5050 LED strips (60leds/m, 20ics/m) 
 +- 12V power supply (HP 750W HSTNS-PL18), provides 62.5A/12V 
 +- Arduino Mega 
 +- Raspberry PI 3 B 
 +- EasyCAP USB grabber with Syntek STK1160 chip set 
 +- Microphone: line in, perhaps with amplifier Iduino SE019 
 +- Switches, Buttons, Photo-resistor, 
 +- Case made from HDF, with cells of size 5x5x5cm, top layer is Transparenzpapier + 3mm clear acrylic 
 + 
 +|![](https://raw.githubusercontent.com/deepestcyber/rgb-tetris-wall/master/photos/cables.png)|![](https://raw.githubusercontent.com/deepestcyber/rgb-tetris-wall/master/photos/casebuilding.png)| 
 +|---|---| 
 +|![](https://raw.githubusercontent.com/deepestcyber/rgb-tetris-wall/master/photos/installed.png)|![](https://raw.githubusercontent.com/deepestcyber/rgb-tetris-wall/master/photos/diffused.png)| 
 + 
 +Energy supply: 
 +- worst case need: 0.02x24x16x9 = 69.12A 
 +- mostly organises via 4×2 molex connectors 
 +- 12 -> 5V converter for Arduino + Raspi + Controlleds (WS2812b) 
 + 
 +## Software: 
 + 
 +### Arduino: 
 + 
 +Purpose: direkt control of all LEDs via the FastLed library. 
 +- controlled via buttons: mode (animations, images, beat dedection, NES Tetris stream, pixelflut), submode (e.g. which animation), speed, brightness 
 +- adaptive brightness via a photo-resistor (with voltage divider via 5k1ohm resistor for input pulldown) 
 +- annimations: library of 16+ animation patterns: rainbow, fire, plasma, ...  
 + 
 +Communication with Raspi: 
 +- SPI, 487500 bps 
 +- Arduino sets sync_pin if ready for receiving data. 
 + 
 +Libraries (C): 
 +- https://playground.arduino.cc/Code/ElapsedMillis 
 +- https://github.com/FastLED/FastLED 
 +- SPI 
 + 
 +### Raspberry PI: 
 + 
 +Purpose: Proprocessing streams of input images, beat detection, NES tetris streams, and pixelflut. 
 +- Image processing: cycles through all images that are located in /images 
 +- Beat detection: Microphone measures sound for simple beat detection that can get visualised 
 +- NES Tetris stream: reads the composite signal of an NES via the Syntek STK1160 grabber. All frames are analysed for the content of the Tetris game: game state, next block, score, level, number of lines 
 +- Pixelflut (tm) 
 + 
 +NES Tetris stream: 
 +- NTSC or PAL possible 
 +- 12-15 fps feasible 
 + 
 +Libraries (python): 
 +- base64 
 +- numpy 
 +- Pillow 
 +- pigpio 
 +- pyserial 
 +- PyV4L2Camera
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