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London Bus Ticker (www.scienceexposure.com) with LCD button support
# London Bus arrivals ticker
# Ismail Uddin, 2015
# www.scienceexposure.com
from TfLAPI import *
import Adafruit_CharLCD as LCD
import time
import sys
from multiprocessing import Process
bSC_a = sys.argv[1]
bSC_b = sys.argv[2]
currentBSC = bSC_a
# RS,EN,D4,D5,D6,D7,Co,Ro,BL
RPi_PIN_config = [27,22,25,24,23,18,16, 2, 4]
try:
if sys.argv[3] == "i2c":
lcd = LCD.Adafruit_CharLCDPlate()
else:
lcd = LCD.Adafruit_CharLCD(*RPi_PIN_config)
except IndexError:
lcd = LCD.Adafruit_CharLCD(*RPi_PIN_config)
lcd.clear()
lcd.message('Initialising...')
print('Initialising...')
lcd.show_cursor(True)
lcd.blink(True)
tfl = TfLBusArrivalsAPI()
lcd.clear()
lcd.message('Fetching TfL bus\narrivals...')
print('Fetching TfL bus\narrivals...')
lcd.blink(True)
def fetchBusArrivals(bSC):
lcd.show_cursor(False)
lcd.blink(False)
try:
jsonObject = tfl.returnTfLJSON(bus_stop_code=bSC)
except urllib2.URLError:
lcd.clear()
print("Unable to connect to Internet...")
lcd.message("Unable to connect \nto Internet...")
busLineDestinationTime = []
for entry in jsonObject:
bLDT = []
bLDT.append(entry['lineName'])
bLDT.append(entry['destinationName'])
bLDT.append(int(entry['timeToStation'])/60.0)
busLineDestinationTime.append(bLDT)
arrivalsList = sorted(busLineDestinationTime, key=lambda x:x[2])
return arrivalsList
def bus_arrivals_loop():
while True:
arrivalsList = fetchBusArrivals(currentBSC)
for bus in arrivalsList:
lcd.clear()
tickerInfo = '%s to %s \nin %.0f minutes' % (bus[0], bus[1], bus[2])
lcd.message(tickerInfo)
print(tickerInfo)
time.sleep(3)
for i in range(16):
time.sleep(0.1)
lcd.move_left()
def buttons_loop():
while True:
if lcd.is_pressed(LCD.LEFT):
currentBSC = bSC_a
elif lcd.is_pressed(LCD.RIGHT):
currentBSC = bSC_b
if __name__ == "__main__":
Process(target=buttons_loop).start()
Process(target=bus_arrivals_loop).start()
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