This is a board to facilitate experimenting with the pyboard-D. It provides an easy way to connect jumper wires to many of the pyboard's pins without having to solder anything to the pyboard itself.
Here is a picture of the PCB I ordered from Osh Park. Production and shipping to France took 20 days. FWIW I was very happy with the price (8.45 USD for three boards) and the quality.
I wasn't confident that I could easily solder the 0.4-mm-pitch WBUS connectors so I added extra WBUS footprints on the back of the board, for training purposes:
The reference for the WBUS connectors is Hirose DF40C-40DS-0.4V(51) (thanks to alustig3 for figuring it out).
It's actually easy to solder the WBUS connectors using low-temperature solder paste such as this one. I put a very small amount of paste on each of the four contact rows, then positioned the two connectors, then laid the board on a heating plate at 150 °C. The solder melted after a minute or two. I precisely repositioned the connectors and let the board cool down.
Predictably, the results are ugly at this stage:
I then removed excess solder and bridges using solder wick and a soldering iron. In the picture below it looks nuch nicer (but note the remaining bridge between Y11 and A3V3, which I corrected later):
At this stage I thoroughly tested the connector pins for bridges/shorts, using a multimeter under a binocular microscope.
I then added female pin headers:
And finally the pyboard itself:
