Embedded Interface LED
LED (Light Emitted Diode)
Symbol
How to Identify the LED’s Positive and Negative Leads ?
- Long lead is positive(+) and small lead is negative(-)
- Round circle lead is positive(+) and flat lead is negative(-)
LED Chemical Substance
Summary of LED’s Colors and Common Chemistries
| Color | Wavelength | Materials |
| Amber | 605-620 nm | Gallium arsenide phosphide, Aluminum gallium indium phosphide |
| Blue | 430-505 nm | IInGaN (Indium Gallium Nitride), Gallium nitride, Silicon carbide, Sapphire, Zinc selenide |
| Green | 550-570 nm | Aluminum gallium phosphide, Gallium nitride |
| Infra-Red | 850-940 nm | Gallium arsenide, AL GaAs (Aluminum Gallium Arsenide) |
| Red | 630-660 nm | AL GaAs (Aluminum Gallium Arsenide), Gallium arsenide phosphide, Gallium phosphide |
| Ultraviolet | 370-400 nm | Indium gallium nitride, Aluminum gallium nitride |
| Violet | 410-420nm | |
| Yellow | 585-595 nm | Aluminum gallium phosphide, Gallium arsenide phosphide, Gallium phosphide |
Light wave length
| WaveLenth | LED APPLICATION |
| 410nm-420nm(violet) | Skin therapy |
| 430nm-470nm(blue) | Dental curing instrument |
| 470nm(blue) | White LED’s using phosphor, blue for RGB white |
| 520nm-530nm(green) | Green traffic signal lights, amber for RGBA white lights |
| 580nm-590nm(amber) | Red signal lights, red for RGBA white lights |
| 630nm-640nm(red) | Blood oximetry |
| 660nm(deep red) | Skin therapy |
| 680nm(deep red) | Night vision illuminators and beacons for use with night vision goggles or CCD’S |
| 800nm-850nm(near IR) | Photo electric controls |
| 940nm(near IR) | Convert illumination CCD based systems |
Reference : http://www.goldwynled.com/knowledge-bank/leds-basics
GLOW LEDs
LEDs ON
LEDs OFF
LEDs Blink
Application
- Status Indicator
- WiFi Router Status Indicator (Blink LEDs-Internet Status)
- Charge level Indication in mobile power-bank [Blink LEDs – Single RGB LEDs or Multiple Color LEDs)
- Bike Automation
- Bike Turn Indicator (LED Blink – while turned)
- Bike Side stand indicator (LED Glow -if Side stand is not took)
- Car Automation
- Car Turn Indicator (LED Blink – while turned)
- Car Door Status indicator(LED Glow -if Door is not close or opened)
LED Examples
- ON/OFF
- Blink using the Delay Function
- Blink using the Timer Function
- Status Indicator(Using condition Check)Button
