PWM - LED fade and Blink

Materials

• AmebaD [ AMB23 / AMB21 / AMB22 / BW16 / BW16-TypeC ] x 1
• LED x 1
• Resistor(220ohm) x 1

Example

PWM use pulse width modulation to control output duty cycle and is widely used to control LED brightness and motor. Here pin PA_26 is used as an example.

Code

Copy and execute each line one by one to see the LED gradually bright up and blink.

from machine import Pin, PWM
p = PWM("PA_26")
# 0 duty cycle thus output 0
p.duty_u16 (0)
# 10% duty cycle
p.duty_u16 (6553)
# 50% duty cycle
p.duty_u16(32768)
# 100% duty cycle
p.duty_u16 (65535)
# 20 Hz at 50% duty cycle, LED blinking
p.duty_u16 (32768)
p.freq(20)