import machine as m
import utime as t

t.sleep(0.01) # for serial ready
print("system start")
led=(m.Pin(15,m.Pin.OUT),m.Pin(14,m.Pin.OUT),
     m.Pin(13,m.Pin.OUT),m.Pin(12,m.Pin.OUT))
pattern=((1,0,0,0),(0,1,0,0),(0,0,1,0),
         (0,0,0,1))
pattern2=((1,1,0,0),(0,0,1,1))
while 1:
    for k in range(4):
        for j in range(4):
            for i in range(4):
                led[i].value(pattern[j][i])
            t.sleep(0.5)
        for j in range(2,0,-1):
            for i in range(4):
                led[i].value(pattern[j][i])
            t.sleep(0.5)
    for k in range (5):
        for j in range(2):
            for i in range(4):
                led[i].value(pattern2[j][i])
            t.sleep(0.5)