from machine import Pin, Timer, PWM, I2C, ADC
from utime import sleep
from time import sleep                  #importing sleep class
import utime

inbuiltLed = 25
led = Pin(inbuiltLed, Pin.OUT)
voltage = ADC(28)           #creating potentiometer object
timer = Timer()

def ledblink(timer):
    led.toggle()

timer.init(freq=2.5, mode=Timer.PERIODIC, callback=ledblink)

buzzer = PWM(Pin(15))
buzzer.freq(1000)
i = 0
while i < 2:
 i += 1
 buzzer.duty_u16(1000)
 sleep(1)
 buzzer.duty_u16(0)
 sleep(1)
 
while True:
 voltage_value = voltage.read_u16()   #reading analog pin
 vvv = (voltage_value * 3.3)/65536
 print("$$P-,%5.3f,2.20;" % vvv)      #printing the ADC value
 sleep(0.05)