from machine import UART
from time import sleep, sleep_ms, sleep_us
var1 = UART(1, baudrate=9600, tx=14, rx=15)
x=1
while True:
  var1.write(str(x))
  var1.write("\r\n")
  x+=1
  sleep_ms(250)

screen /dev/tty.usbmodem51850010041 9600