Note, these parts must be soldered in so the back sides are facing out. If
placed incorrectly, the batteries will not fit. Ensure they are flush and that
the back sides are facing out:
Solder into place. When you are done, your board should look like this:
6 Leds
Careful, these next 6 parts are polarized and need to be placed into the
PCB properly. To learn more about polarization, please check out this other
tutorial: Diode and LED Polarity
Locate the 6 LEDs. There should be one of each color:
LEDs are polarized. This means there are “-” and “+” legs. Similar to the IR
emitter and detectors, the LEDs have difference length legs to show
polarity:
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