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#         Varry LED Brightness using Potentiometer          #
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#
# LED Brightness Control uing Potentiometer on Raspberry Pi Pico with MicroPython
#
# Check out the link for Code explanation and Hardware details
# Link: 
#   http://tech.arunkumarn.in/blogs/raspberry-pi-pico/
#
# duty cycle value in raspberry pi pico is 16 bit data.
# minimum value will be 0 for 0% duty cycle
# maximum value will be 65535 for 100% duty cycle

from machine import Pin, PWM, ADC
from time import sleep_ms

# Led is connected to GPIO 2
# setting PWM frequency to 1k Hz and duty cycle to 0
led = PWM(2, freq=1000, duty_u16=0)

# Potentiometer is connected to GPIO 26 (ADC 0)
control = ADC(26)


while True:

    # Read the position of Potentiometer
    brightness = control.read_u16()

    # Set PWM value according to the POT position
    led.duty_u16(brightness)

    sleep_ms(100)