Add MicroPython snippets

main.py

@@ -0,0 +1,93 @@
+from time import sleep, localtime
+from machine import Pin, Timer
+
+clock = Pin(3, mode=Pin.OUT)
+latch = Pin(0, mode=Pin.OUT)
+data = Pin(2, mode=Pin.OUT)
+
+lut = [
+    0b1011, # 0
+    0b1001, # 1
+    0b1100, # 2
+    0b1000, # 3
+    0b0000, # 4
+    0b0100, # 5
+    0b0001, # 6
+    0b0011, # 7
+    0b0010, # 8
+    0b1010, # 9
+]  
+
+def bitbang_bit(value):
+    if value & 1:
+        data.on()
+    else:
+        data.off()
+    clock.on()
+    clock.off()
+
+def bitbang_digit(digit, width=4):
+    for i in range(0,width):
+        bitbang_bit(lut[digit] << i << 1 >> width)        
+        
+def bitbang_latch():
+    latch.on()
+    latch.off()
+
+state = 0
+
+timer = Timer(-1)
+
+def schedule(delay=0):
+    if delay:
+        timer.init(period=1000, mode=Timer.ONE_SHOT, callback=dump)
+    else:
+        dump()
+        
+def dump_time(hour, minute, second):
+    bitbang_bit(state)
+    bitbang_digit(hour // 10)
+    bitbang_bit(state)
+    bitbang_bit(state)
+    bitbang_bit(state)
+
+    bitbang_bit(state)
+    bitbang_digit(hour % 10)
+    bitbang_bit(state)
+    bitbang_bit(state)
+    bitbang_bit(state)
+
+    bitbang_bit(state)
+    bitbang_digit(minute // 10)
+    bitbang_bit(state)
+    bitbang_bit(state)
+    bitbang_bit(state)
+    
+    bitbang_bit(state)
+    bitbang_digit(minute % 10)
+    bitbang_bit(state)
+    bitbang_bit(state)
+    bitbang_bit(state)
+    
+    bitbang_bit(state)
+    bitbang_digit(second // 10)
+    bitbang_bit(state)
+    bitbang_bit(state)
+    bitbang_bit(state)
+
+    bitbang_bit(state)
+    bitbang_digit(second % 10)
+    bitbang_bit(state)
+    bitbang_bit(state)
+    bitbang_bit(state)
+
+
+def dump(t=None):
+    global state
+    year, month, day, hour, minute, second, _, millis = localtime()
+    dump_time((hour + 3) % 24, minute, second)
+    bitbang_latch()
+    state = 1-state
+    schedule(1000-millis)
+
+schedule()