Assemble a Universal PCB

Step 23 Optional Assembly: 2 Extra Buttons

This optional step is for those who want to use the '2 Extra Buttons Option'. This will give you two additional play buttons, for a total of 8 (not including Start + Select). This option is mutually exclusive with the '2 Status LEDs Option'; you can pick one if you like, but don't use both. If you don't want to use the option for additional buttons, you can ignore this altogether.

First, we need two 4.7K Ohm resistors. Bend the legs, and place one through the holes for the resistor marked OPT3, and the other resistor through the holes for OPT4. Lay the resistors down as flat against the board as you can, and bend the legs to secure it in place. Solder the four points, and trim off any excess wire. Keep the pieces you trim off; we'll need them next.

Next, we need to jumper the resistor points marked OPT2 and OPT5. We do not need any kind of resistor here, we need to connect them together with the pieces of extra wire you trimmed off previously. Bend the wire to insert into the holes in the OPT2 spot. Insert, and rest it as flat against the board as you can, making sure it doesn't touch any other components. Bend the legs to secure it in place, and solder. Trim off any extra wire. Repeat with a piece of wire in the spot marked OPT5.

The two additional buttons will use the RA0 and RA1 lines. We just tied them to high with a pull up resistor, and you will need to connect the RA0 and RA1 lines in the corner of the UPCB to your two extra buttons. The other legs of the buttons must connect to ground; you can use the ground pins right next to the RA0 and RA1 points, but these are just a convienence. Any ground connection will do.