🎛️ PWM - Analog Output with MicroPython

📖 PWM LED Dimming:

from machine import Pin, PWM
import time

# Create PWM object on GP0 at 1kHz frequency
led = PWM(Pin(0))
led.freq(1000)

# Fade LED up and down
while True:
    # Fade up
    for duty in range(0, 65535, 1000):
        led.duty_u16(duty)
        time.sleep(0.01)
    
    time.sleep(0.5)
    
    # Fade down
    for duty in range(65535, 0, -1000):
        led.duty_u16(duty)
        time.sleep(0.01)
    
    time.sleep(0.5)
    

💧 Variable Speed Water Pump:

from machine import Pin, PWM, ADC
import time

# Setup
pump = PWM(Pin(0))  # PWM pin for pump control
pump.freq(1000)
moisture_sensor = ADC(Pin(26))  # ADC pin

def read_moisture():
    raw = moisture_sensor.read_u16()  # 0-65535
    percent = 100 - (raw / 65535 * 100)
    return max(0, min(100, percent))

while True:
    moisture = read_moisture()
    print(f"Soil moisture: {moisture:.1f}%")
    
    if moisture < 20:
        pump.duty_u16(65535)  # Full speed
        print("Pump: FULL SPEED")
    elif moisture < 40:
        # Map moisture to pump speed
        speed = int(32768 + (moisture - 20) * 1000)
        pump.duty_u16(speed)
        print(f"Pump: MEDIUM SPEED")
    else:
        pump.duty_u16(0)  # Pump OFF
        print("Pump: OFF")
    
    time.sleep(60)  # Update every minute