from machine import Pin, SoftI2C, ADC, PWM
from i2c_lcd import I2cLcd
from time import sleep_ms

led = PWM(Pin(12), freq=10000, duty=0)

i2c = SoftI2C(scl=Pin(22), sda=Pin(21), freq=400000)
lcd = I2cLcd(i2c, 0x27, 2, 16) #i2c, address, 2 rows, 16 cols

lcd.backlight_on()
lcd.clear()
lcd.putstr("ADC:\n")
lcd.putstr("Vol:")

ldr = ADC(Pin(35))
ldr.atten(ADC.ATTN_11DB)

def map(x, in_min, in_max, out_min, out_max):
    return int((x - in_min)*(out_max - out_min)/(in_max - in_min) + out_min)

while True:
    val = ldr.read() # reads 0-4096
    duty = map(val, 0, 4095, 1023, 0) #duty writes 0-1023

    lcd.move_to(5, 0)
    lcd.putstr("%-5d" %(val))
    lcd.move_to(5, 1)
    voltage = str((val*5)/1023) # convert to voltage
    lcd.putstr("%sV" %(voltage[0:3]))

    led.duty(duty) #set duty cycle
    print(val, "|", duty)
    sleep_ms(100)