from machine import Pin
import time

# 0,1,2,3,4,5,6,7,8,9,A,b,C,d,E,F
led_num = (0x3F,0x06,0x5B,0x4F,0x66,
           0x6D,0x7D,0x07,0x7F,0x6F,
           0x77,0x7C,0x39,0x5E,0x79,
           0x71,0x80)
gpio = (15,2,4,16,17,5,18,19)
led = []

for i in range(0, len(gpio)): #adds an item to list
    led.append(Pin(gpio[i], Pin.OUT))

def playLED(num):
    segment=led_num[num]
    for i in range(8):
        if segment & 0b1: #check LSB bit
            led[i].on()
        else:
            led[i].off()
        segment >>= 1 #shift right
    
i=0
while True:
    playLED(i)
    time.sleep_ms(400)
    i+=1
    if i>15:
        i=0

#the common pin can be anode or cathode, in this case, cathode (GND)