Raspberry Pi VGA-Board

A VGA 666 Hut for the Raspberry PI. It provides a VGA output over the GPIOs It's build wiht a resistor ladder - 6 resistors for each colour. And that's why it will use so many pins: GPIO Pins 2-21.
The design of the adapter is based on Raspberry-Pi VGA Adapter of G.J. van Loo, it needs the same software like the original adapter:
https://github.com/fenlogic/vga666.git
Front:

Back:


Schematic

VGA Socket

The VGA socket is a bit tricky. One has to cut some pins and solder all ground pins together. Here are some pictures how it is done:
1. 2.
3. 4.

Pin 9 has changed from key to +5V so it's best to remouve it!
https://en.wikipedia.org/wiki/VGA_connector


Paper-PCB

Parts

Resistors:

  • 2x 120 Ohm
  • 3x 500 Ohm
  • 4x 1kOhm
  • 3x 2 kOhm
  • 3x 4 kOhm
  • 3x 8 kOhm
  • 3x 16 kOhm

Mechanical:

  • VGA connector
  • 1x connector 2x20pin
  • 1x buttons

Installation

https://github.com/fenlogic/vga666/tree/master/documents
download https://github.com/fenlogic/vga666/archive/master.zip
unpack
copy dt-blob-dpi.bin to /boot/dt-blob.bin\\

http://blog.queststem.com/post/129339443931/quick-start-guide-gerts-passive-vga-adapter-666
https://www.raspberrypi.org/forums/viewtopic.php?t=94424&f=91

 $ sudo apt-get update
 $ sudo apt-get upgrade

In:

 $ sudo nano /boot/config.txt

add this:

 dtoverlay=vga666

and this:

 enable_dpi_lcd=1
 display_default_lcd=1

Dont forget to add the resolution, too:
for 1080p60

 dpi_group=2
 dpi_mode=82

for 1024×768 60Hz

 dpi_group=2
 dpi_mode=16

… more video-mode for DMT and CEA are on:
https://www.raspberrypi.org/documentation/configuration/config-txt.md

Disable the SPI and I2C interfaces, otherwise VGA666 will not work correctly. Use the “Advanced Options” from raspi-config to disable SPI and I2C.

 $ sudo raspi-config

Install shutdown button
http://paperpcb.dernulleffekt.de/doku.php?id=raspberry_boards:duino-pi_modification#install_shutdown_reset_button

Install blinking LED
http://paperpcb.dernulleffekt.de/doku.php?id=raspberry_boards:duino-pi_modification#install_blinking_led
If necessary change in the blink file the GPIO pin number to 27.


Knowlegde