from machine import Pin,ADC,PWM
from neopixel import NeoPixel
adc = ADC(Pin(34)) 
adc.atten(ADC.ATTN_11DB)  
adc.width(ADC.WIDTH_12BIT) 
np = NeoPixel(Pin(23, Pin.OUT),1)
color1 = (0,255,0)
color2 = (255,255,0)
color3 = (255,0,0)
while 1:
    value = adc.read() 
    print(value)
    if value>3160:
        np[0] = color1
        np.write()
    elif value<=3160 and value>1420:
        np[0] = color2
        np.write()
    elif value<=1420:
        np[0] = color3
        np.write()