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
|최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (상)|
|최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (하)|
Original Book Contents
25.2.3 Precautions and Features in Using GPIO
● Precautions in using GPIO pin
■ When powering Raspberry Pi, make sure that metal object does not touch the GPIO pin.
■ Do not supply more than total 250mA current from 5V power pin.
■ Do not supply more than total 50mA current from 3.3V power pin.
■ Do not supply higher than 3.3V to all GPIO pins at the input.
■ Do not use more than 3mA current per pin at the output.
■ Do not supply higher than 5V power to Raspberry Pi.
● Features of GPIO Pin
■ If no current flows through the pin, you can not determine what the initial state is. That is, it is floating.
■ The pin remembers the last state until the system is shut down. When you exit the program after issuing a command to turn on the pin, the pin remains on until you release another command.