Additional Button in nrf52-dk

[Raja]

When adding extra buttons on breadboard for NRF52-DK do we need to use resistors OR i can directly connect one leg to GPIO pin i.e 30 and another to gnd.

[MartinBL]

Hi,

In most cases you will need some sort of pull up/down resistor to make sure that the GPIO held at a stable voltage when the button is not pressed (either high or low dependent on your button configuration). However, the nRF5 SoCs all have internal pull up/down resistors and you can use these instead of external ones. In other words, yes, you can connect the button directly to the GPIO. This is what we do with the buttons on the nRF52 DK.