from machine import Pin, PWM, ADC   # Import Pin, PWM, and ADC for analog input
from utime import sleep_ms

# Servo on pin 21
servo1 = PWM(Pin(21), freq=50)

# Potentiometer on pin 34 (ADC pin on ESP32)
pot = ADC(Pin(34))      
pot.atten(ADC.ATTN_11DB) # Allow full range (0–3.3V)
pot.width(10)            # 10-bit resolution (0–1023)

while True:
    val = pot.read()     # Read potentiometer (0–1023)

    # Map potentiometer value to servo duty range (40–110)
    pos = int((val / 1023) * (130 - 20) + 20)
    
    servo1.duty(pos)     # Move servo to position
    sleep_ms(20)         # Small delay for smooth motion