Sunday, 24 May 2015

Pi Supply Gert VGA666 Assembly

So i have had this rocking around for some time now and I though it was high time that i gave it a test run.

This is the Gert VGA666 from Pi Supply. Designed a by Gert Van Loo of Raspberry Pi fame and ran as a successful kickstarter campaign back in October 2014 ( which is where mine has come from ).

The Gert VGA666 is a clever breakout board for the Raspberry Pi that allows it to use the GPIO header to generate a VGA signal.  This done with only 20 Resistors to mimic an analog signal  the VGA monitor use the obvious downside to this is that you use up a lot of the GPIO pins.

 Assembly       

On the Pi Supply product Page there is a link to a Github Repository that contains the instructions, some of the details on how it works and the required files to make the Pi work with it .


This is the what comes in the Kit:
  • PCB 
  • 20 Resistors 
  • VGA socket 
  • extended GPIO Connector 
  • 2 Stickers and a Business card directing you towards the Pi Supply Website 
 This first thing I recommend doing is layout the parts and use a multimeter to check and label the tapes of resistors with all their values on the blue cased film resistor I find the colours hard to distinguish so i usually go straight for the multimeter as better choice than tying to remember my resistor band colours.


Labeling just helps when you come to the placing the parts. there should be:

  • 2 x 120 ohm
  • 3 x 500 ohm
  • 3 x 1K ohm
  • 3 x 2K ohm 
  • 3 x 4K ohm
  • 3x  8K ohm 
  • 3 x 16K ohm 

I find the colour key in the instruction a little hard to follow so here is a Bill of Materials for the Resistors.
 Label            Resistance (ohms)
R2 -          500
R4 -          1000
R6 -          2000
R8 -          4000
R10 -        8000
R12 -        16000
R14 -        500
R16 -        1000
R18 -        2000
R20 -        4000
R22 -        8000
R24 -        16000
R26 -         500
R28 -        1000
R30 -        2000
R32 -        4000
R34 -        8000
R36 -        16000
R38 -          120
R40 -          120

Then it is just a case of placing all the resistors in their correct locations and fold the leads outward for me I like to place all the resistors first as this lest me see if I have any location wrong before soldering.


The back of the PCB becomes a bit of a 'Rats Nest' of resistor leads but there is plenty of space to solder them form the topside.



After soldering use a sideways cutter to trim all the leads if and if there are any joins looking a little low on solder apply more (best to do this as a better solder joint will give a more stable signal).


 now make sure the PCB is the correct way up for the next bit the instructions say 'The Connectors are at the same side as the surface mount resistors'

Then it is just a case of soldering first the GPIO connectors soldering one corner pin first to make sure that it is flush to the board then solder the rest of the pins you can insert the VGA connector if it makes the PCB a bit more stable to solder for you.

Then solder up the VGA connector.

ALL Assembled!

I will continue the software setup and testing in another post. Click Here

 

No comments:

Post a Comment