Raspberry Pi and breadboard basic knowledge

Thanks to Siwa Angsoontornsarid to teach me it.
LinkedIn account of Siwa Angsoontornsarid


1. Breadboard architecture

2. Turn on LED

In order to turn on a LED, the LED needs to be connected/completed with + and -.
The breadboard in the picture in connected to raspberry Pi and the raspberry Pi is connected to power.

Long leg needs to be +.

This picture shows how the breadboard and raspberry Pi work.
The Pi provides + and - to breadboard(3V).

A leg of LED is directly connected to +.
Another leg is connected to "24 a".
A ohm is linking - and "24 b".
Since "24 a" and "24 b" is linked, the LED is completed with + and -.
Since the LED is completed, LED is turned on.

The role of ohm is to reduce power.
If the LED is completed without a ohm, it can be burned.

Please do not practice it in area of raspberry Pi. (Red part)
There is a possibility that the Pi can broken.

You can turn on the LED like this architecture. You just need to complete the LED with + and -.

You can use a button to turn on a LED.
LED is directly connected to + and "26 a" and a ohm links - and "26 i".
The button in the picture is connecting line 26, so if you click the button,
the LED will be completed with + and -.

In this way, you can turn on a LED that has several colors. A LED in the picture has 4 legs.
If you complete the LED with different legs, you can change colors.