Step 1: The Problem...
While plugging in various shields I have into the ‘Wing Tip Extensions’ I built I noticed an odd thing…display shields needed to be rotated 90 degrees to be of any real use…case in point the Adafruit RGB Display Shield shown, it works just fine but it’s orientation doesn’t work.
Back to the drawing board…or this case Eagle Cad.
Step 2: The Design...
I couldn’t figure a way to do it with only one side so I made it into a double sided layout.
The via’s are larger than normal to accommodate drilling the holes.
No room for any icons…just a simple layout.
Step 3: Etching
Usually the registration is off and the holes don’t line up…but this time I tried "booking" the PCB and had success.
I laser printed the top and bottom layers on to transparent sheets,
taped the bottom layer to a sheet of glass,
aligned the top layer over the bottom and made sure all the holes lined up. (Take your time)
taped only one edge of the top layer down so I could slip my Photo PCB between the layers like a book.
then placed another sheet of glass on top then using spring clamps I hold the ‘book’ together.
Exposed each side for 8 mins each, develop and etch as normal…I liked the results.
Step 4: Drilling
The via holes, are just free hand.
Take your time to center them the best you can.
For the header holes I used a .80mm drill bit and for the via’s a .70mm drill bit.
Step 5: Vias by Hand
I first bent ‘staple’ shapes out of scrap component leads.
Inserted the staples into the board and then soldered the legs first to keep them in place.
Clipped the top and straightened them so I could solder the other side.
Do this for all the via holes, keep an eye on your work for solder bridges.
Step 6: Male & Female Headers
Solder the Male pins in first using your Arduino as a guide to help keep the pins in alignment.
Double check that you are soldiering on the trace side to make connection to your headers.
Step 7: Assembly
Installed the Adafruit RGB Display Shield and Voila!
It works! The display and buttons are correctly aligned now.
Step 8: Final Note
The ‘Twist Shield’ was designed to rotate the footprint Clockwise, but by mirroring the board layout during exposure you can make a Counter Clockwise twist board as well…two boards from one set of plans.