In this project we’re going to assemble the XBee Pulse I/O Printed Circuit Board — an open-source hardware design which can be used to automate things wirelessly. This hardware is used in the “12,000-mile Universal Remote” project from Make Vol. 30.
Start by solder in the tiny 10pf capacitor C4. The capacitor will be labelled with an itty-bitty number 102. You may need a magnifying glass to read it. These ceramic capacitors have no polarity and can be put in the board in any orientation.
Solder in the 0.01uF capacitors. They will be labelled with a small number 104.
The next capacitors are electrolytic and have a polarity. This means they need to be placed in the board matching the long leg to the little + sign on the board.
Solder in the 10uF capacitors C6 and C9.
Solder in the 22uF capacitor C1.
Finally, solder in the 47uF capacitor C2. It may be slightly larger than the silkscreen outline on the board.