from machine import Pin, Timer

# Create tuple of the seven segment cathodes.
segs = (Pin('GP0',Pin.OUT), Pin('GP2',Pin.OUT), Pin('GP13',Pin.OUT), Pin('GP14',Pin.OUT),
        Pin('GP15',Pin.OUT), Pin('GP1',Pin.OUT), Pin('GP12',Pin.OUT))

digits = [(0,0,0,0,0,0,1), (1,0,0,1,1,1,1), (0,0,1,0,0,1,0), (0,0,0,0,1,1,0),
    (1,0,0,1,1,0,0), (0,1,0,0,1,0,0), (0,1,0,0,0,0,0), (0,0,0,1,1,1,1),
    (0,0,0,0,0,0,0), (0,0,0,0,1,0,0)]

counter = 0

def digitCounter(timer):
    global counter
    for i in range(7):
        segs[i].value(digits[counter][i])
    if counter < 9:
        counter = counter + 1
    else:
        counter = 0

tmr = Timer(period = 500, callback=digitCounter)