Hardware description
Figure 12: Disconnecting the LEDs
The LEDs and buttons can also be disconnected by using the I/O expander as described in I/O expander for
buttons and LEDs on page 15.
The buttons are active low, which means that input is connected to ground when the button is activated.
The buttons have no external pull-up resistor, so the P0.13—P0.16 pins must be configured as input with
an internal pull-up resistor to use the buttons.
The LEDs are active low, meaning that writing a logical zero (0) to the output pin illuminates the LED.
Figure 13: Button and LED configuration
4.5.1 I/O expander for buttons and LEDs
The onboard GPIOs for the buttons and LEDs can conflict with boards that follow the Arduino standard.
Therefore, the nRF52 DK has an I/O expander to avoid such conflicts.
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