In the components list, 3B GPIO, Extension Shield Raspberry and Breadboard are necessary for each project.
They will be listed only in text form later.
Component knowledge
LED
LED is a kind of diode. LED will shine only if the long pin of LED is connected to the positive electrode and the
short pin is connected to negative electrode.
This is also the features of the common diode. Diode works only if the voltage of its positive electrode is
higher than its negative electrode.
The LED can not be directly connected to power supply, which can damage component. A resistor with certain
resistance must be connected in series in the circuit of LED.
Resistor
The unit of resistance(R) is ohm(Ω). 1mΩ=1000kΩ, 1kΩ=1000Ω.
Resistor is an electrical component that limits or regulates the flow of current in an electronic circuit.
The left is the appearance of resistor, and the right is the symbol of resistor represented in circuit.
Color rings attached to the resistor is used to indicate its resistance. For more details of resistor color code,
please refer to the appendix of this tutorial.
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