python-escpos/examples/weather.py

#!/usr/bin/python


# Adapted script from Adafruit
# Weather forecast for Raspberry Pi w/Adafruit Mini Thermal Printer.
# Retrieves data from DarkSky.net's API, prints current conditions and
# forecasts for next two days.
# Weather example using nice bitmaps.
# Written by Adafruit Industries.  MIT license.
# Adapted and enhanced for escpos library by MrWunderbar666

# Icons taken from http://adamwhitcroft.com/climacons/
# Check out his github: https://github.com/AdamWhitcroft/climacons

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import calendar
import json
import os
import time
import urllib
from datetime import datetime

from escpos.printer import Usb

""" Setting up the main pathing """
this_dir, this_filename = os.path.split(__file__)
GRAPHICS_PATH = os.path.join(this_dir, 'graphics/climacons/')

# Adapt to your needs
printer = Usb(0x0416, 0x5011, profile='POS-5890')

# You can get your API Key on www.darksky.net and register a dev account.
# Technically you can use any other weather service, of course :)
API_KEY = 'YOUR API KEY'

LAT = '22.345490'       # Your Location
LONG = '114.189945'     # Your Location


def forecast_icon(idx):
    icon = data['daily']['data'][idx]['icon']
    image = GRAPHICS_PATH + icon + '.png'
    return image


# Dumps one forecast line to the printer
def forecast(idx):
    date = datetime.fromtimestamp(int(data['daily']['data'][idx]['time']))
    day = calendar.day_name[date.weekday()]
    lo = data['daily']['data'][idx]['temperatureMin']
    hi = data['daily']['data'][idx]['temperatureMax']
    cond = data['daily']['data'][idx]['summary']
    print(date)
    print(day)
    print(lo)
    print(hi)
    print(cond)
    time.sleep(1)
    printer.set(
        font='a',
        height=2,
        align='left',
        bold=False,
        double_height=False)
    printer.text(day + ' \n ')
    time.sleep(5)           # Sleep to prevent printer buffer overflow
    printer.text('\n')
    printer.image(forecast_icon(idx))
    printer.text('low ' + str(lo))
    printer.text(deg)
    printer.text('\n')
    printer.text(' high ' + str(hi))
    printer.text(deg)
    printer.text('\n')
    # take care of pesky unicode dash
    printer.text(cond.replace(u'\u2013', '-').encode('utf-8'))
    printer.text('\n \n')


def icon():
    icon = data['currently']['icon']
    image = GRAPHICS_PATH + icon + '.png'
    return image


deg = ' C'      # Degree symbol on thermal printer, need to find a better way to use a proper degree symbol

# if you want Fahrenheit change units= to 'us'
url = 'https://api.darksky.net/forecast/' + API_KEY + '/' + LAT + ',' + LONG + \
    '?exclude=[alerts,minutely,hourly,flags]&units=si'  # change last bit to 'us' for Fahrenheit
response = urllib.urlopen(url)
data = json.loads(response.read())

printer.print_and_feed(n=1)
printer.control('LF')
printer.set(font='a', height=2, align='center', bold=True, double_height=True)
printer.text('Weather Forecast')
printer.text('\n')
printer.set(align='center')


# Print current conditions
printer.set(font='a', height=2, align='center', bold=True, double_height=False)
printer.text('Current conditions: \n')
printer.image(icon())
printer.text('\n')

printer.set(font='a', height=2, align='left', bold=False, double_height=False)
temp = data['currently']['temperature']
cond = data['currently']['summary']
printer.text(temp)
printer.text(' ')
printer.text(deg)
printer.text(' ')
printer.text('\n')
printer.text('Sky: ' + cond)
printer.text('\n')
printer.text('\n')

# Print forecast
printer.set(font='a', height=2, align='center', bold=True, double_height=False)
printer.text('Forecast: \n')
forecast(0)
forecast(1)
printer.cut()
printer.control('LF')