# Import Pin, ADC and DAC modules.
from machine import ADC,Pin,DAC,PWM
import time
pwm = PWM(Pin(5))  
pwm.freq(50)

# Turn on and configure the ADC with the range of 0-3.3V 
adc=ADC(Pin(34))
adc.atten(ADC.ATTN_11DB)
adc.width(ADC.WIDTH_12BIT)

# Read ADC value once every 0.1seconds, convert ADC value to DAC value and output it,
# and print these data to “Shell”. 
try:
    while True:
        adcVal=adc.read()
        dacVal=adcVal//16
        voltage = adcVal / 4095.0 * 3.3
        print("ADC Val:",adcVal,"DACVal:",dacVal,"Voltage:",voltage,"V")
        if(voltage > 0.6):
            pwm.duty(46)
        else:
            pwm.duty(100)
        time.sleep(0.1)
except:
    pass