Installing from PyPI¶
On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:
pip3 install adafruit-circuitpython-charlcd
To install system-wide (this may be required in some cases):
sudo pip3 install adafruit-circuitpython-charlcd
To install in a virtual environment in your current project:
mkdir project-name && cd project-name python3 -m venv .env source .env/bin/activate pip3 install adafruit-circuitpython-charlcd
This driver depends on:
I2C & SPI displays also depend on:
Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.
Character_LCD class interfaces a predefined Character LCD display with CircuitPython.
import board import digitalio import adafruit_character_lcd.character_lcd as character_lcd
You must define the data pins (
D7) in your code before using the
If you want to have on/off
backlight functionality, you can also define your backlight as
lcd_backlight. Otherwise, the backlight
will always remain on. The following is an example setup.
lcd_rs = digitalio.DigitalInOut(board.D7) lcd_en = digitalio.DigitalInOut(board.D8) lcd_d7 = digitalio.DigitalInOut(board.D12) lcd_d6 = digitalio.DigitalInOut(board.D11) lcd_d5 = digitalio.DigitalInOut(board.D10) lcd_d4 = digitalio.DigitalInOut(board.D9) lcd_backlight = digitalio.DigitalInOut(board.D13)
You must also define the size of the CharLCD by specifying its
lcd_columns = 16 lcd_rows = 2
After you have set up your LCD, we can make the device by calling it
lcd = character_lcd.Character_LCD_Mono(lcd_rs, lcd_en, lcd_d4, lcd_d5, lcd_d6, lcd_d7, lcd_columns, lcd_rows, lcd_backlight)
To verify that your pins are correct, print a hello message to the CharLCD:
lcd.message = "Hello\nCircuitPython"
Custom character example with
create_char() is provided within /examples/
Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.
This library is NOT built into CircuitPython to make it easy to update. To install it either follow the directions below or install the library bundle.
- Download and unzip the latest release zip.
- Copy the unzipped
libdirectory on the
To build this library locally you’ll need to install the circuitpython-build-tools package.
python3 -m venv .env source .env/bin/activate pip install circuitpython-build-tools
Once installed, make sure you are in the virtual environment:
Then run the build:
circuitpython-build-bundles --filename_prefix adafruit-circuitpython-charlcd --library_location .
Sphinx is used to build the documentation based on rST files and comments in the code. First, install dependencies (feel free to reuse the virtual environment from above):
python3 -m venv .env source .env/bin/activate pip install Sphinx sphinx-rtd-theme
Now, once you have the virtual environment activated:
cd docs sphinx-build -E -W -b html . _build/html
This will output the documentation to
docs/_build/html. Open the index.html in your browser to
view them. It will also (due to -W) error out on any warning like Travis will. This is a good way to
locally verify it will pass.