Light Emitting Diode: LED

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Presentation transcript:

Light Emitting Diode: LED

What is an LED? Light-emitting diode Semiconductor Has polarity

LED: How It Works When current flows across a diode Negative electrons move one way and positive holes move the other way

LED: How It Works The holes exist at a lower energy level than the free electrons Therefore when a free electrons falls it losses energy

LED: How It Works This energy is emitted in a form of a photon, which causes light The color of the light is determined by the fall of the electron and hence energy level of the photon

Inside a Light Emitting Diode Transparent Plastic Case Terminal Pins Diode

Kinds of LEDs

How to Connect a LED: Requires 1.5~2.5V and 10 mA To prevent overloading, use resistor 470 Ω

How to Connect a LED:

Connect LED to BS2 LED is on when P0 is high LED is on when P1 is low

Connect Multiple LEDs to BS2 8 LEDs are connected to BS2 each I/O pin (P0-P7) is allowed to sink 6.25mA

Case Study: Blinking LED

Case Study: Blinking LED Pbasic program to make an LED blink output 0 Main: low 0 pause 1000 high 0 goto Main Make pin0 an output Loop begins here Turn LED on Pause for 1 sec Turn LED off Pause for 1 sec Go back to beginning of loop

Experiments Flash an LED Traffic Light by use of LEDs Single LED Multiple LEDs Traffic Light by use of LEDs