====== Enhancement of IO-Port#1 and IO-Port #2 ======
The **ODROID-U3** provides two expansion sockets.\\

{{:en:u3:u3ioport.png?500|}}

**Easy to use GPIOs**\\
First, you refer to below link.\\
You check Export number that you want to use GPIO.\\
[[u3_hardware&#expansion_connectors | Pins description.]]

Create a GPIO file access.\\
You can access GPIOs using sysfs interface.
  echo 199 > /sys/class/gpio/export
Configure the pin direction (in/out)
  echo out > /sys/class/gpio/gpio199/direction
Write a value (1/0)
  echo 1 > /sys/class/gpio/gpio199/value

===== GPIO-I2C =====
  * [[u3_ioport_i2c | I2C interface using the GPIO pins]]
===== SPI =====
  * [[u3_ioport_spi | SPI interface using the IO-Port #2]]
===== UART =====
  * [[u3_ioport_uart | UART interface using the IO-Port #1]]