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PWM

Overview

The PWM sample demonstrates using the pwmio module to fade the Green LED (alias LED0) on nRF52840 Connect Kit.

Requirements

Before you start, check that you have the required hardware and software:

Running the code

To run the code, complete the following steps:

  1. Connect nRF52840 Connect Kit to your computer using the USB-C Cable.
  2. Start Mu Editor, click Load to open code.py in the CIRCUITPY drive.

  3. Copy and paste the following code into code.py and click Save:

    CIRCUITPY/code.py
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    import time
import board
import pwmio

# Connect LED0 to PWMOut
led = pwmio.PWMOut(board.LED0, frequency=5000, duty_cycle=0)

while True:
    for i in range(100):
        # PWM LED up and down
        if i < 50:
            led.duty_cycle = int(i * 2 * 65535 / 100)  # Up
        else:
            led.duty_cycle = 65535 - int((i - 50) * 2 * 65535 / 100)  # Down
        time.sleep(0.01)

  4. Your code will run as soon as the file is done saving. Observe that the Green LED starts off increases its brightness until it is fully on and then decreases until the LED is off, completing on fade cycle.