from microbit import *
# program to test out a rotary encoder
# when you rotate the knob the LEDs will follow :-)
# Jonathan Hare March 2017
# see www.creative-science.org.uk/bbcmicrobit.html

# port 19 and port 20 for the A and B encoder connections
# also 0 and +3V to encoder
# note may need extra pull-up resistors (e.g. 1k)

# led dot definitions
a = Image("00900:00000:00000:00000:00000")
b = Image("00090:00000:00000:00000:00000")
c = Image("00009:00000:00000:00000:00000")
d = Image("00000:00009:00000:00000:00000")
e = Image("00000:00000:00009:00000:00000")
f = Image("00000:00000:00000:00009:00000")
g = Image("00000:00000:00000:00000:00009")
h = Image("00000:00000:00000:00000:00090")
i = Image("00000:00000:00000:00000:00900")
j = Image("00000:00000:00000:00000:09000")
k = Image("00000:00000:00000:00000:90000")
l = Image("00000:00000:00000:90000:00000")
m = Image("00000:00000:90000:00000:00000")
n = Image("00000:90000:00000:00000:00000")
o = Image("90000:00000:00000:00000:00000")
p = Image("09000:00000:00000:00000:00000")

aa = 0
bb = 0
vala = 0
valb = 0
count = 8   
   
while True:   
    aa = pin19.read_digital()
    if aa != vala:
        bb = pin20.read_digital()
        if bb != vala:   
            count = count + 1   
        else:
            count = count - 1
    if count < 0:
       count = 0
    if count >16:
       count = 16    
       
    if count == 0: 
        display.show(a)
    if count == 1:
        display.show(b)
    if count == 2:
        display.show(c) 
    if count == 3:
        display.show(d)
    if count == 4:
        display.show(e)
    if count == 5:
        display.show(f)
    if count == 6:
        display.show(g)
    if count == 7:
        display.show(h)
    if count == 8:
        display.show(i)
    if count == 9:
        display.show(j)
    if count == 10:
        display.show(k)
    if count == 11:
        display.show(l)
    if count == 12:
        display.show(m)
    if count == 13: 
        display.show(n)
    if count == 14:
        display.show(o)
    if count == 15:
        display.show(p)  
    if count == 16:
        display.show(a)  
    vala = aa
    valb = bb