===== Audio and Video Signal Processing – a VGA Hacking Workshop =====
27. - 28. March 2020\\


==== Experimental VGA Processor ===

[[https://paperpcb.dernulleffekt.de/doku.php?id=vga_synthesizer:experimental_vga_processor|Experimental VGA Processor]]\\
{{:experimental_vga_processor.jpg?600|}}\\

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==== additional VGA Boards ====
**VGA outputboard for the Raspberry Pi:**\\
{{:vga_hacking_piksel2018:vga-666_board_pi_190334.jpg?400|}}\\
[[http://paperpcb.dernulleffekt.de/doku.php?id=raspberry_boards:raspberry_vga_board]]\\

**VGA Breakout Board**\\
{{:vga_hacking_piksel2018:vga_breakout_board.jpg?400|}}\\
[[http://paperpcb.dernulleffekt.de/doku.php?id=vga_synthesizer:vga_breakout_board]]\\

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==== Fake a VGA device ====

**Color Signal ------ 75R ------ GND**\\

[[http://www.geeks3d.com/20091230/vga-hack-how-to-make-a-vga-dummy-plug/]]\\

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==== Audio to VGA ====
[[http://crackedraytube.com/pdfs/hacking_a_vga_monitor.pdf]]\\
{{:vga_hacking_piksel2018:vga2arcade.gif?400|}}\\

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==== VGA Signal Generator ====
[[https://www.ebay.de/itm/New-VGA-Signal-Generator-LCD-Tester-15-Signal-Output-USB-Battery-Power-Supply-/162727211414?hash=item25e34c3196|VGA Signal Generator]]\\

=== VGAX Library for Arduino UNO ===
[[https://github.com/smaffer/vgax]]\\
HSYNC and VSYNC signals are squared pulses of +5V, and the RGB signals take values in a continuous analog voltage range from +0V (absolutely dark) to +0.7V (maximum brightness).\\

**Connection**\\
H-Sync -- 68 Ohm -- Pin 03\\
V-Sync -- 68 Ohm -- Pin 10\\
R -- 470 Ohm -- Pin 04\\
G -- 470 Ohm -- Pin 05\\
B -- 470 Ohm -- Pin 06\\

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==== Inverting the Signal ====
[[https://www.electronics-tutorials.ws/opamp/opamp_2.html]]\\

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==== I2C over VGA ====
{{:vga_hacking_piksel2018:vga_to_i2c.jpg?400|}}\\
[[http://dernulleffekt.de/doku.php?id=i2c_over_vga]]\\

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==== Links ====
[[https://eater.net/vga|eater.net - VGA]]\\
[[http://lucidscience.com/pro-vga%20video%20generator-1.aspx|lucidscience.com - pro VGA Video Generator]]\\
[[http://blogs.fsfe.org/pboddie/?p=1712|blogs.fsfe.org - VGA Signal Generation with the PIC32]]\\
[[http://www.javiervalcarce.eu/html/vga-signal-format-timming-specs-en.html|javiervalcarce.eu - VGA Video Signal Format]]\\
[[http://www.gammon.com.au/forum/?id=11608|gammon.com.au - Arduino Uno output to VGA monitor]]\\
[[https://github.com/smaffer/vgax|github.com - VGAX Library for Arduino UNO]]\\
[[http://tinyvga.com/vga-timing|tinyvga.com - VGA Signal Timing]]\\
[[https://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2012/raf225_dah322/raf225_dah322/|Homemade VGA Adapter]]\\

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