import time
import board
import busio
import math
import neopixel
import adafruit_gps
cadena = neopixel.NeoPixel(board.D8, 10)
uart = busio.UART(board.TX, board.RX, 
    baudrate=9600, timeout=100)
gps = adafruit_gps.GPS(uart)
cf = b'PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0'
gps.send_command(cf)
gps.send_command(b'PMTK220,1000')
cLt = 41.384033
cLg = 2.115993
a = 0.002
b = 0.003
anterior = time.monotonic()
while True:
    gps.update()
    actual = time.monotonic()
    if (actual - anterior) >= 1.0:
        anterior = actual
        if not gps.has_fix:
            print('Esperando...')
        else:
            Lt = gps.latitude
            Lg = gps.longitude
            dLt = math.fabs(Lt - cLt)
            dLg = math.fabs(Lg - cLg)
            cadena[0] = (0, 255, 0)
            if (dLt > a) or (dLg > a):
                cadena[0] = (255, 255, 0)
            if (dLt > b) or (dLg > b):
                cadena[0] = (255, 0, 0)