__init__.py

import bhi160
import display
import leds
import os
import utime

try:
    accel = bhi160.BHI160Accelerometer()
except:
    os.reset()

leds.clear()
with display.open() as d:
    d.clear()
    d.update()

for i in range(3):
    leds.set_rocket(i, 0)

# Characters are encoded in columns per 11 bits in an integer.
# LSB = top, MSB = bottom.
charset = {
    'A': [0x780, 0x178, 0x107, 0x178, 0x780],
    'B': [0x7ff, 0x663, 0x663, 0x19c],
    'C': [0x1fc, 0x306, 0x603, 0x603],
    'D': [0x7ff, 0x603, 0x603, 0x30e, 0x1fc],
    'E': [0x7ff, 0x663, 0x663, 0x663],
    'F': [0x7ff, 0x063, 0x063, 0x063],
    'G': [0x7ff, 0x603, 0x633, 0x1e6],
    'H': [0x7ff, 0x060, 0x060, 0x7ff],
    'I': [0x603, 0x7ff, 0x603],
    'J': [0x780, 0x603, 0x603, 0x7ff],
    'K': [0x7ff, 0x070, 0x1dc, 0x707],
    'L': [0x7ff, 0x600, 0x600, 0x600],
    'M': [0x7ff, 0x006, 0x0fc, 0x006, 0x7ff],
    'N': [0x7ff, 0x00e, 0x078, 0x1c0, 0x7ff],
    'O': [0x1fc, 0x603, 0x603, 0x603, 0x1fc],
    'P': [0x7ff, 0x063, 0x03e, 0x01c],
    'Q': [0x1fc, 0x603, 0x683, 0x703, 0x7fc],
    'R': [0x7ff, 0x063, 0x3e3, 0x41c],
    'S': [0x67f, 0x663, 0x663, 0x7e3],
    'T': [0x003, 0x003, 0x7ff, 0x003, 0x003],
    'U': [0x1ff, 0x600, 0x600, 0x600, 0x1ff],
    'V': [0x00f, 0x0f0, 0x700, 0x0f0, 0x00f],
    'W': [0x7ff, 0x300, 0x8f0, 0x300, 0x7ff],
    'X': [0x603, 0x1dc, 0x020, 0x1dc, 0x603],
    'Y': [0x003, 0x00c, 0x7f8, 0x00c, 0x003],
    'Z': [0x783, 0x6c3, 0x673, 0x61b, 0x60f],
    '_': [0x400] * 4,
}

nick = 'sample text'
try:
    with open('/nickname.txt', 'r') as f:
        nick = str(f.read())
except:
    pass

string = []
for c in nick.upper():
    if not c in charset:
        c = '_'
    string = string + charset[c] + [0]

while True:
    sign = lambda v: 1 if v>=0 else -1
    accel_hist = []
    direction = 0
    while direction == 0:
        samples = accel.read()
        accel_hist.extend([ 0 if abs(s.y) < 0.2 else s.y for s in samples ])
        accel_hist = accel_hist[max(len(accel_hist)-20, 0):]
        if len(accel_hist) > 2:
            direction = sign(accel_hist[-1]) - sign(accel_hist[-2])
    colors = [(0, 0, 0), (0xff, 0xff, 0xff)]
    string_iter = string
    if direction > 0:
        string_iter = reversed(string_iter)
    for column in string:
        for l in range(11):
            leds.set(10-l, colors[column>>l & 1])
    leds.clear()
    utime.sleep(0.001)