Simple Binary Clock

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Posts: 27
Joined: Thu Jul 30, 2020 6:04 am

Simple Binary Clock

Post by 2600Sam »

So a few slow days at work I was able to complete my other project and finish this one as well.
Here is my simple binary clock in python for the Crowpi using its 8x8 led matrix.
a friend showed me how to use the .zfill() and pythons binary conversion which cut my code in half.
This is a 24-hour clock if you want a 12-hour clock just add an if statement in build_display if hour > 12: hour -=12

Code: Select all

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# copyleft 05-08-2020 Sam Sheeley
# decode 4 bit binary the below example = 5
# 8
# 4 *
# 2
# 1 *

from luma.led_matrix.device import max7219
from luma.core.interface.serial import spi, noop
from luma.core.render import canvas
import datetime
serial = spi(port=0, device=1, gpio=noop())
# rotate the display x3 so it can be read while in front of the crowpi
device = max7219(serial, cascaded=1,  block_orientation=0, rotate=3)
device.contrast(1 * 16)
# device is setup and ready.. yes, no, maybe, I dont know can you repeate the question

def face_display(bit_bucket): # display the IT's clock face of
    with canvas(device) as draw:
        for pix_col, binary in enumerate(bit_bucket):
            for pix_row, bit in enumerate(binary):
                draw.point((pix_col+1, pix_row+3), fill=int(bit))

def build_display(hour, minute, second): # fill the bit bucket with binary number
    bit_bucket = []
    string_hour = str(hour).zfill(2) # make everything 2 digits the convert both to 4 bit binary
    bit_bucket.extend(dec_to_bin(string_hour[count]) for count in range(0, 2))
    string_minute = str(minute).zfill(2)
    bit_bucket.extend(dec_to_bin(string_minute[count]) for count in range(0, 2))
    string_second = str(second).zfill(2)
    bit_bucket.extend(dec_to_bin(string_second[count]) for count in range(0, 2))
    face_display(bit_bucket) # actual dewing of it
    del bit_bucket[:] # empty the bucket 

def dec_to_bin(num):# return a 4 bit binary number
    return '{0:04b}'.format(int(num)).zfill(4)

def main():
    now =
    last_sec = now.second
    while( == last_sec):
        now = # a different now required here, why? because! I don't know
        build_display(now.hour, now.minute, now.second) # dewit

if __name__ == '__main__':
    except KeyboardInterrupt:
        # clear the matrix for exit
Last edited by 2600Sam on Thu Sep 10, 2020 10:22 pm, edited 1 time in total.
Posts: 21
Joined: Mon Apr 06, 2020 1:19 pm

Re: Simple Binary Clock

Post by g7jjf »

Works great !

Thanks for the demo.
Posts: 27
Joined: Thu Jul 30, 2020 6:04 am

Re: Simple Binary Clock

Post by 2600Sam »

glad somebody found it useful :)
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