| .. _fade-led-sample: |
| |
| Fade LED |
| ######## |
| |
| Overview |
| ******** |
| |
| This application "fades" a LED using the :ref:`PWM API <pwm_api>`. |
| |
| The LED starts off increases its brightness until it is fully or nearly fully |
| on. The brightness then decreases until the LED is off, completing on fade |
| cycle. Each cycle takes 2.5 seconds, and the cycles repeat forever. The PWM |
| period is taken from Devicetree. It should be fast enough to be above the |
| flicker fusion threshold. |
| |
| Requirements and Wiring |
| *********************** |
| |
| This sample has the same requirements and wiring considerations as the |
| :ref:`pwm-blinky-sample`. |
| |
| Building and Running |
| ******************** |
| |
| To build and flash this sample for the :ref:`nrf52840dk_nrf52840`: |
| |
| .. zephyr-app-commands:: |
| :zephyr-app: samples/basic/fade_led |
| :board: nrf52840dk_nrf52840 |
| :goals: build flash |
| :compact: |
| |
| Change ``nrf52840dk_nrf52840`` appropriately for other supported boards. |
| |
| After flashing, the sample starts fading the LED as described above. It also |
| prints information to the board's console. |
