Step 1: Gather Necessary Supplies and Tools
40-Pin 2.54mm (0.1") Header Pin Strip x2 (Digikey, Newark, Local Electronics Shop)
10cm (4") 22AWG Black Stranded Wire
The header pins I used were 20cm long. These longer pins may be difficult to find, but you should be able to order them from an online supplier. The standard length (~8mm) can be used, however they may make things a bit tight.
- Soldering Iron
- Wire Strippers
- Side Cutters
Step 2: Prepare the Parts
Next, take the 17-Pin strip and wedge it into the two 8-pin strips at a 90-degree angle. Be sure to insert the pins such that there is one disconnect pin between the two receptacles, as shown below.
Step 3: Solder the Joints
Optional - Remove the unconnected pin between pins seven and eight. I personally find that this makes it easier when counting the pins. The pin can be removed by gripping the long end with a pair of side cutters and briefly heating the short end with a soldering iron. This will melt the plastic base of the header pin strip just enough to pull the pin out.
Be very careful not to get any solder on the Arduino, as a solder bridge may render it useless.