LEDs - those blinky things. A must have for power indication, pin status, opto-electronic sensors, and fun blinky displays.
This is a very standard green LED. The lens is 3mm in diameter, and is diffused.
If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
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It is just your average LED but with two "Perks". The first perk is that it is only 3 millimeters (Mm) in diameter which is nice if it isn't the main focus of the project. This is great for indicator lights or just to brighten up your project. The second perk is that it only requires 2 volts. This is great for low power projects. Normal LED's usually use 3.3-5 volts which may not seem like a huge difference but when you need a lighter battery it is nice to be able to preserve the battery a little bit. And thank to everyone who read this for putting up with my rambling.