PWM: Fade LED¶
This is a sample app which fades a LED using PWM.
The LED will start from dark and increases its brightness gradually for 10 seconds. Then, the brightness reduces gradually for 10 seconds and finally the LED becomes dark again. The LED will repeat this cycle for ever.
Connect PWM2(PA0) to LED
Connect PWM1(PA8) to LED
No special board setup is necessary because there are three on-board LEDs (red, green, blue) connected to the Nucleo’s PWM.
No special board setup is necessary because there is an on-board RGB LED connected to the K64 PWM.
No special board setup is necessary because there is an on-board LED connected.
You will need to connect the LED to ground and PWM0 via the shield. You may need a current limiting resistor. See your LED datasheet.
Building and Running¶
This sample can be built for multiple boards, in this example we will build it for the nrf52840_pca10056 board:
west build -b nrf52840_pca10056 samples/basic/fade_led west flash
Using CMake and ninja:
cmake -B build -GNinja -DBOARD=nrf52840_pca10056 samples/basic/fade_led ninja -C build ninja -C build flash