PWM: Fade LED¶
Overview¶
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.
Wiring¶
Nucleo_F401RE, Nucleo_L476RG¶
Connect PWM2(PA0) to LED
Nucleo_F103RB¶
Connect PWM1(PA8) to LED
Nucleo_L496ZG¶
No special board setup is necessary because there are three on-board LEDs (red, green, blue) connected to the Nucleo’s PWM.
Hexiwear K64¶
No special board setup is necessary because there is an on-board RGB LED connected to the K64 PWM.
nrf52840_pca10056¶
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