Connecting external LED to nrf9160dk

[yeo]

Dear Nrodic Team,

I am connecting LEDs to nrf9160dk which is pin 14 and pin 15. In the following code, I have configured such that LED0 is aliased to Pin 14 and LED2 is aliased to LED2. For LED2 I am using the function gpio_pin_toggle_dt to blink the LED and it works fine. However for LED0, I use the function gpio_pin_set_dt(&led,1) but the LED2 doesn't light up. May I know how to resolve this issue to ensure that LED2 can be turned on and off by using the function gpio_pin_set_dt?

7610.blinky_2.zip

[Sigurd]

Hi,

Pin 14 and 15 is connected to the interface MCU. See this link: https://infocenter.nordicsemi.com/topic/ug_nrf91_dk/UG/nrf91_DK/if_connector.html

I suggest finding some other pins.

[yeo]

Hi, what other pins would u suggest ? 

[Sigurd]

Try P0.10 and P0.20

[yeo]

Hi, it still doesn't work when I use either pin 0.10 or 0.20.

[Sigurd]

Could you explain a bit more your setup? You have connected some external LEDs to the DK ?

[yeo]

Yup I have connected two LEDs to my DK. And I am planning to light up the LEDs by using the function gpio_pin_set_dt. Do you have sample code for me? 

[yeo]

I do know that blinky can help to light up the in built LED but I want to connect external LED To the gpio. 

[Sigurd]

Could you share schematics and/or pictures that shows how these LEDs are connected? Are they e.g. active low or high?

[yeo]

So it's just an external LED connects to a gpio that is able to provide high voltage, and it's cathode connects to ground. 

[yeo]

Hope to provide the gpio to send digital HIGH so that it can be lighted up. 

[yeo]