Ah, the fun stuff. The reason you purchased the kit. To try your hand at SMD soldering. Yes you can do it! I personally have used two different techniques with this board. Let’s call the one technique the “Reflow Skillet” technique and the other the “heat and slide” (hand soldering) technique. SparkFun has a really good tutorial on the “heat and slide” method that you can read here. They also have a good write-up on the “Reflow Skillet” method here. Then there’s another good surface mount tutorial at Curious Inventor. You probably want to review all these before you proceed.
Now, here’s the board we’re going to be putting components on. There are NO through-hole components at all. Everything is surface mounted and there are components on both sides of the board.
And here’s most of what you’re going to be soldering onto the board. (no, not the penny!) That’s one 20 pin SOIC ATTINL26L along side one of the 49 LEDs. Are you up for the challenge? You can do it! Just take it slow and steady…
The end product, front and back. Forty Nine LEDs in a 7×7 matrix on the front. Six pin programming interface on one edge and power jumper on the other edge. Backside holds the replaceable CR2032 battery and the AVR processor. Note – The bead is just shown as an example of what you can do. The kit/assembled unit only includes 2 split rings and hemp cord.