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MicroPython driver for MY9221 10-segment LED bar graph modules
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LICENSE.txt
README.md
my9221.py
my9221_test.py

README.md

MicroPython MY9221

A MicroPython library for 10 segment LED bar graph modules using the MY9221 LED driver.

For example, the Grove - LED Bar module

demo

Examples

Copy the file to your device, using ampy, webrepl or compiling and deploying. eg.

$ ampy put my9221.py

Basic usage

from my9221 import MY9221
from machine import Pin
ledbar = MY9221(di=Pin(4), dcki=Pin(5))

# all LEDS on, full brightness
ledbar.level(10)

# four LEDS on, half brightness
ledbar.level(4, 0x0F)

# first and last LED on
ledbar.bits(0b1000000001)
ledbar.bits(0x201)
ledbar.bits(513)

# alternating LEDs
ledbar.bits(0b0101010101)
ledbar.bits(0b1010101010)

# fade out LEDs
buf = bytearray([0,1,3,7,15,31,63,127,255,255])
ledbar.bytes(buf)

# reverse orientation, first LED is green
ledbar.reverse(True)
ledbar.level(1)

# normal orientation, first LED is red
ledbar.reverse(False)
ledbar.level(1)

For more detailed examples, see my9221_test.py

Methods

Get or set the orientation. The red LED normally position 1, and when reversed is position 10. Once orientation has been set, all other methods respect the order.

reverse(val=None)

Illuminate a number of LEDs at a specific brightness. A value of 5 would light half of the display.

level(val, brightness=255)

Illuminate LEDs, one bit per LED at a specific brightness. Value can be 0-1023.

bits(val, brightness=255)

Use a bytearray, one byte per LED, to specify individual brightness for each LED.

bytes(buf)

Parts

Connections

WeMos D1 Mini Grove LED Bar
D2 (GPIO4) DI (yellow)
D1 (GPIO5) DCKI (white)
3V3 (or 5V) VCC (red)
G GND (black)

Links

License

Licensed under the MIT License.

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