The following code illustrates how to display integers, characters, floating point, hex values and toggle the colon on a 7-segment display.
# SPDX-FileCopyrightText: 2019 Mikey Sklar for Adafruit Industries
#
# SPDX-License-Identifier: MIT
import time
import board
import busio
from adafruit_ht16k33 import segments
# Create the I2C interface.
i2c = busio.I2C(board.SCL, board.SDA)
# Create the LED segment class.
# This creates a 7 segment 4 character display:
display = segments.Seg7x4(i2c)
# Clear the display.
display.fill(0)
# Can just print a number
display.print(42)
time.sleep(1)
# Set the first character to '1':
display[0] = '1'
# Set the second character to '2':
display[1] = '2'
# Set the third character to 'A':
display[2] = 'A'
# Set the forth character to 'B':
display[3] = 'B'
time.sleep(1)
numbers = [0.0, 1.0, 0.55, 10.23, 100.5]
# print floating point numbers
for i in numbers:
display.print(str(i))
time.sleep(0.5)
# print hex values, enable colon
for i in range(0xFF):
display.fill(0)
display.print(':')
display.print(hex(i))
time.sleep(0.25)
We can easily copy this code onto our Pi's home directory using the 'wget' command and then run it using the following commands.
cd wget https://raw.githubusercontent.com/adafruit/Adafruit_Learning_System_Guides/master/Matrix_7-Segment_LED_Backpack_Raspberry_Pi/sevensegment_test.py python3 ./sevensegment_test.py
This will briefly scroll through printing integers, floating point values, some text characters and hex values on a seven segment display.
Page last edited January 22, 2025
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