8
9)
Insert the LEDs from the opposite side (shown in the picture on the next page) and solder
them. Pay attention to the polarity of the LEDs. The square-shaped pads indicate the
anode (+) which is the longer lead and the shorter lead is the cathode (-). Cut the leads
once they are soldered. Don’t cut them all the way, leave at least 1 to 2mm of the leads.
10)
Finish your soldering by inserting the CR2032 battery holder on the board and soldering it
from the opposite side. Since the drill size for this component on the PCB is large, it is
recommended to use a large flat head soldering tip to properly heat up the pad and the
leads. This way a we create a perfect soldering joint.
