from utime import sleep
sleep(0.1) # Wait for USB to become ready

import random
from machine import Pin, I2C, Timer
from pico_i2c_lcd import I2cLcd

sda = Pin(0)
scl = Pin(1)

i2c = I2C(0, sda=sda, scl=scl, freq=40000)

devices = i2c.scan()
i2c_addr = devices[0]

lcd = I2cLcd(i2c, i2c_addr, 2, 16)

leds = []
for i in range(16, 21):
  leds.append(Pin(i, Pin.OUT))

def random_num(t):
  num = random.randint(1, 5)
  lcd.putstr(str(num))
  leds[num - 1].on()
  sleep(0.5)
  leds[num - 1].off()
  lcd.clear()

tim = Timer(mode=Timer.PERIODIC, freq=1, callback=random_num)