Introduction¶

A port of the PyPortal library intended to run on Blinka in CPython.

Dependencies¶

This driver depends on:

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-blinka-pyportal

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-blinka-pyportal

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-blinka-pyportal

Contributing¶

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Documentation¶

For information on building library documentation, please check out this guide.

Table of Contents¶

Simple test¶

Ensure your device works with this simple test.

examples/adafruit_blinka_pyportal_bitcoin.py¶

# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
#
# SPDX-License-Identifier: Unlicense
"""
This example will access the coindesk API, grab a number like bitcoin value in
USD and display it on a screen
If you can find something that spits out JSON data, we can display it!

You can find any resources in the associated Learn Guide at:
https://learn.adafruit.com/pyportal-bitcoin-value-display
"""
import os
import time
from adafruit_pyportal import PyPortal

# You can display in 'GBP', 'EUR' or 'USD'
CURRENCY = "USD"
# Set up where we'll be fetching data from
DATA_SOURCE = "https://api.coindesk.com/v1/bpi/currentprice.json"
DATA_LOCATION = ["bpi", CURRENCY, "rate_float"]


def text_transform(val):
    if CURRENCY == "USD":
        return "$%d" % val
    if CURRENCY == "EUR":
        return "‎€%d" % val
    if CURRENCY == "GBP":
        return "£%d" % val
    return "%d" % val


# the current working directory (where this file is)
try:
    cwd = os.path.dirname(os.path.realpath(__file__))
except AttributeError:
    cwd = ("/" + __file__).rsplit("/", 1)[0]

pyportal = PyPortal(
    url=DATA_SOURCE,
    json_path=DATA_LOCATION,
    default_bg=cwd + "/bitcoin_background.bmp",
    text_font=cwd + "/fonts/Arial-Bold-24-Complete.bdf",
    text_position=(195, 130),
    text_color=0x0,
    text_transform=text_transform,
)
pyportal.preload_font(b"$012345789")  # preload numbers
pyportal.preload_font((0x00A3, 0x20AC))  # preload gbp/euro symbol

while True:
    try:
        value = pyportal.fetch()
        print("Response is", value)
    except (ValueError, RuntimeError) as e:
        print("Some error occured, retrying! -", e)

    time.sleep(3 * 60)  # wait 3 minutes

`adafruit_pyportal`¶

A port of the PyPortal library intended to run on Blinka in CPython.

Author(s): Melissa LeBlanc-Williams

Implementation Notes¶

Software and Dependencies:

Adafruit Blinka for supported boards: https://github.com/adafruit/Adafruit_Blinka/releases

class adafruit_pyportal.PyPortal(*, url=None, headers=None, json_path=None, regexp_path=None, convert_image=True, default_bg=0, status_neopixel=None, text_font=<fontio.BuiltinFont object>, text_position=None, text_color=8421504, text_wrap=False, text_maxlen=0, text_transform=None, text_scale=1, json_transform=None, image_json_path=None, image_resize=None, image_position=None, image_dim_json_path=None, caption_text=None, caption_font=None, caption_position=None, caption_color=8421504, image_url_path=None, success_callback=None, esp=None, external_spi=None, debug=False, display=None, touchscreen=None, secrets=None)¶

Class representing the Adafruit PyPortal.

Parameters:

url – The URL of your data source. Defaults to None.
headers – The headers for authentication, typically used by Azure API’s.
json_path – The list of json traversal to get data out of. Can be list of lists for multiple data points. Defaults to None to not use json.
regexp_path – The list of regexp strings to get data out (use a single regexp group). Can be list of regexps for multiple data points. Defaults to None to not use regexp.
convert_image – Determine whether or not to use the AdafruitIO image converter service. Set as False if your image is already resized. Defaults to True.
default_bg – The path to your default background image file or a hex color. Defaults to 0x000000.
status_neopixel – The pin for the status NeoPixel. Use board.NEOPIXEL for the on-board NeoPixel. Defaults to None, not the status LED
text_font (str) – The path to your font file for your data text display.
text_position – The position of your extracted text on the display in an (x, y) tuple. Can be a list of tuples for when there’s a list of json_paths, for example
text_color – The color of the text, in 0xRRGGBB format. Can be a list of colors for when there’s multiple texts. Defaults to None.
text_wrap – Whether or not to wrap text (for long text data chunks). Defaults to False, no wrapping.
text_maxlen – The max length of the text for text wrapping. Defaults to 0.
text_transform – A function that will be called on the text before display
text_scale (int) – The factor to scale the default size of the text by
json_transform – A function or a list of functions to call with the parsed JSON. Changes and additions are permitted for the dict object.
image_json_path – The JSON traversal path for a background image to display. Defaults to None.
image_resize – What size to resize the image we got from the json_path, make this a tuple of the width and height you want. Defaults to None.
image_position – The position of the image on the display as an (x, y) tuple. Defaults to None.
image_dim_json_path – The JSON traversal path for the original dimensions of image tuple. Used with fetch(). Defaults to None.
success_callback – A function we’ll call if you like, when we fetch data successfully. Defaults to None.
caption_text (str) – The text of your caption, a fixed text not changed by the data we get. Defaults to None.
caption_font (str) – The path to the font file for your caption. Defaults to None.
caption_position – The position of your caption on the display as an (x, y) tuple. Defaults to None.
caption_color – The color of your caption. Must be a hex value, e.g. 0x808000.
image_url_path – The HTTP traversal path for a background image to display. Defaults to None.
esp – A passed ESP32 object, Can be used in cases where the ESP32 chip needs to be used before calling the pyportal class. Defaults to None.
external_spi (busio.SPI) – A previously declared spi object. Defaults to None.
debug – Turn on debug print outs. Defaults to False.
display – The displayio display object to use
touchscreen – The touchscreen object to use. Usually STMPE610 or FocalTouch.
secrets – The secrets object to use. If not supplied we will attempt to import.

fetch(refresh_url=None, timeout=10)¶: Fetch data from the url we initialized with, perfom any parsing, and display text or graphics. This function does pretty much everything Optionally update the URL

set_caption(caption_text, caption_position, caption_color)¶

A caption. Requires setting caption_font in init!

Parameters:	caption_text – The text of the caption. caption_position – The position of the caption text. caption_color – The color of your caption text. Must be a hex value, e.g. `0x808000`.