Example Five - Binary Counter¶
examples/qwiic_led_stick_ex5_binary_counter.py¶
1# !/usr/bin/env python
2# ---------------------------------------------------------------------------------
3# qwiic_led_stick_ex5_binary_counter.py
4#
5# This example counts up from 0 to 1023 and displays the number in binary on the
6# LED Stick.
7# --------------------------------------------------------------------------------
8#
9# Written by Priyanka Makin @ SparkFun Electronics, June 2021
10#
11# This python library supports the SpakrFun Electronics qwiic sensor/
12# board ecosystem on a Raspberry Pi (and compatible) board computers.
13#
14# More information on qwiic is at https://www.sparkfun.com/qwiic
15#
16# Do you like this library? Help support SparkFun by buying a board!
17#
18#==================================================================================
19# Copyright (c) 2019 SparkFun Electronics
20#
21# Permission is hereby granted, free of charge, to any person obtaining a copy
22# of this software and associated documentation files (the "Software"), to deal
23# in the Software without restriction, including without limitation the rights
24# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
25# copies of the Software, and to permit persons to whom the Software is
26# furnished to do so, subject to the following conditions:
27#
28# The above copyright notice and this permission notice shall be included in all
29# copies or substantial portions of the Software.
30#
31# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
32# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
33# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
34# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
35# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
36# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
37# SOFTWARE.
38#==================================================================================
39# Example 5
40
41from __future__ import print_function
42import qwiic_led_stick
43import time
44import sys
45
46def binary_LED_display(LED_stick, count, LED_length):
47 # Create color arrays because we want to turn on whole string of LEDs at one time
48 red_list = [0] * LED_length
49 green_list = [0] * LED_length
50 blue_list = [0] * LED_length
51
52 # This for loop will repeat for each pixel of the LED Stick
53 for i in range(0, LED_length):
54 # For ith_bit, we use the bitshift operator. count >> i takes the binary
55 # representation of count and shifts it to the right i times. For example,
56 # if count was 10, 0b1010, and i was 2, we get 0b10. This aligns with the
57 # ith bit of count to the 0th bit of ith_bit
58 ith_bit = count >> i
59 # This will resolve to the oth bit of ith_bit
60 ith_bit_true = ith_bit & 0b1
61 # Write the color red to the current LED if the ith_bit_true
62 # LED_stick.set_single_LED_color(10 - i, 255 * ith_bit_true, 0, 0)
63 red_list[LED_length - i - 1] = 255 * ith_bit_true
64
65 LED_stick.set_all_LED_unique_color(red_list, green_list, blue_list, LED_length)
66
67def binary_serial_display(count, bit_length):
68 print(str(count) + "\t" + str(bin(count)))
69
70def run_example():
71
72 print("\nSparkFun Qwiic LED Stick Example 5")
73 my_stick = qwiic_led_stick.QwiicLEDStick()
74
75 if my_stick.begin() == False:
76 print("\nThe Qwiic LED Stick isn't connected to the system. Please check your connection", \
77 file=sys.stderr)
78 return
79 print("\nLED Stick ready!")
80
81 # Reset the state of LEDs
82 my_stick.LED_off()
83
84 while True:
85 # This loop counts from 0 to 1023 and displays the binary over the
86 # serial port and the LED stick
87 for i in range(0, 1024):
88 binary_LED_display(my_stick, i, 10)
89 binary_serial_display(i, 10)
90 time.sleep(1)
91
92if __name__ == '__main__':
93 try:
94 run_example()
95 except (KeyboardInterrupt, SystemExit) as exErr:
96 print("\nEnding Example 5")
97 sys.exit(0)