Starter Guide

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Lesson 06 LED module
Introduction
This lesson, we will take you to learn how to let an LED blink.
What is LED?
The LED is the abbreviation of light emitting diode. It is usually made of
gallium arsenide, gallium phosphide semiconductor materials. The LED has
two electrodes, a positive electrode and a negative electrode, it will light
only when a forward current passes, and it can be red, blue, green or yellow
light, etc. The color of light depends on the materials it was made.
In general, the drive current for LED is 5-20mA. Therefore, in reality it
usually needs an extra resistor for current limitation so as to protect the LED.
What is resistor?
The main function of the resistor is to limit current. In the circuit, the
character ‘R’ represents resistor, and the unit of resistor is ohm(Ω).
The band resistor is used in this experiment. A band resistor is one whose
surface is coated with some particular color through which the resistance
can be identified directly. The LED module we used in this lesson is SMD
resistor. We soldered it directly to the pcb board. As is shown below：
N
NULL
+
VCC
-
Pin