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.
Nucleo_F401RE and Nucleo_L476RG¶
Connect PWM2(PA0) to LED
Connect PWM1(PA8) to LED
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.
Arduino 101 and Quark D2000 CRB¶
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 arduino_101 board:
# On Linux/macOS cd $ZEPHYR_BASE/samples/basic/fade_led mkdir build && cd build # On Windows cd %ZEPHYR_BASE%\samples\basic\fade_led mkdir build & cd build cmake -GNinja -DBOARD=nrf52840_pca10056 .. ninja ninja flash