(39545) Stockton STEM Badge LEDs
Notice how the LEDs typically have one leg longer than the other; this is called the "anode". The colored case also has one flat side, opposite the longer leg; the leg on this side is called the "cathode". Also, note the distinctive shape of what is inside the colored case; this can also be used to help determine its orientation. The gap at the top of the metal surface is always on the anode side. LEDs can only be used the right way round so determining orientation is important.
(37174) Stockton STEM Badge LEDs
The case of an LED can crack if the legs are bent too close to it; even after placing the LED on the board, only bend the legs slightly to hold it in place.
(36982) Stockton STEM Badge capacitors
The capacitors smooth the power on the badge. The top capacitor, is not polarity sensitive; that is, it can be used either way round. The other capacitor must be used only the correct way round; the case has a "-" symbol printed on it.
(35120) Stockton STEM Badge completed
Press the button to start the lights!
(34924) Stockton STEM Badge LEDs
While all components can be destroyed with an excess of heat during soldering, LEDs are especially susceptible to this.
(33312) Stockton STEM Badge LEDs
Green and blue LEDs
(33099) Stockton STEM Badge LEDs
The footprint for the LEDs also shows a flat edge; orientation of the LEDs needs to match that of the board.
(32862) Stockton STEM Badge components
The badge consists of a handful of electronic components. Components R1, R5 and J1 are not normally populated.
(32733) Stockton STEM Badge resistors
These are 47 ohm resistors; they limit the current supplied to the orange, yellow and green LEDs. The blue LED does not require one.
(31857) Stockton STEM Badge battery
The battery is a typical CR2032 button cell. Notice which side the "+" is on.
(31299) Stockton STEM Badge IC and socket
The chip, an integrated circuit, or IC, must also be used the correct way round. Both the chip and its socket have a notch at one end to identify its orientation.
(31203) Stockton STEM Badge electrolytic capacitor
Electrolytic capacitors are polarity sensitive; note the "-" symbol on one side of the capacitor package. These capacitors typically have a larger capacity than their ceramic counterparts and are used for bulk storage; this one is used to assist the battery when the LEDs turn on. This is necessary because button cell batteries are not designed to provide as much power as the LEDs can demand.
(31105) Stockton STEM Badge IC
Once pushed all the way in, the IC may sit above the socket, but it will be parallel to it.
(31024) Stockton STEM Badge components
(30701) Stockton STEM Badge IC socket
Soldered legs.