Published Book on Amazon
|All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 1|
|All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 2|
출판된 한글판 도서
Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (상)
Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (하)
Original Book Contents
3.10 External Interface
Raspberry Pi can communicate with and control devices outside the system through a bidirectional interface with external devices. It can receive input or output through an external device, or adjust an external device. A key device for this is the GPIO (General Purpose Input Output) port. Here, I will briefly mention the preparations required to use this GPIO. For details, refer to [Chapter 25 External Interface]:
■ GPIO Extension board or cobbler
This allows the GPIO device of the Raspberry Pi main board to be extended to the outside and connected to the external separate device, so that all the pins of the GPIO can be mapped to each other to freely work from the outside. It facilitates the creation of prototypes by experimentally constructing and testing circuits.
This is the device where 2.54mm spaced holes to insert the wires into are placed in the grid pattern on the front so that can insert and pull out electronic parts.
■ Jump wires
Jump wires are used to connect components and circuits when constructing a circuit. The solid wire of one strand is better than the stranded cable of several strands for the jumper wire. If you use multiple colored wires, you can distinguish them by color for each usage.
A resistor is an electronic component that has the effect of dropping the voltage by interrupting the flow of current so that the current does not flow well in the electric circuit, and is often used in most electronic circuits.
■ Push button
The push button connects the circuit when the button is pressed, and the connection is cut off immediately when the switch is released.
LED (Light-emitting diode) are widely used as a device for determining whether electricity flows through a specific line when constructing an electronic circuit.
The sensor is a device that grasps the state of the surrounding object and is a device that performs a function corresponding to the human senses. The sensor detects the state of the object around itself, detects the occurrence of the event, senses and measures the variation of the quantity, and delivers it in the form of electric signal or optical signal.