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script.py
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script.py
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#!/usr/bin/python
import json
import sys
import urllib2
import threading
import random
import subprocess
import time
import time
import textwrap
from datetime import datetime
import serial
from Adafruit_Thermal import *
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
# GPIO 23 set up as input. It is pulled up to stop false signals
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(25, GPIO.IN, pull_up_down=GPIO.PUD_UP)
# This script is used to call the api then return choices to the user and display on LCD
# User first selects from a list of pre-defined categories
# Script will then make an api call to retrieve all nearby POIs of that category
# User can then select one of the POIs and machine will print a ticket
#
# > python script.py
#
# Requires the base_url to be working and hosting the open city api - this is currently down so script will fail..
#
# Note: Uncomment the "import" lines and set debug=False when running on the actual rpi
# Note: Currently having problems with line wrapping and new line printing on the LCD display
# Note: Also, the buttons have not been integrated yet, so this script relies on keyboard input solely for now
button = {'START': 1, 'IDEA': 2, 'PRINT': 3}
# PRINTER_GPIO = 27
# GPIO.setup(PRINTER_GPIO, GPIO.OUT)
class ParkingMeter:
categories = ["Get Back to Nature", "Within 2km", "Give Back to Community", "Today only", "Weekly"]
ser = ""
printer = ""
base_url = "http://opencityproject.australiasoutheast.cloudapp.azure.com:38080/v1"
debug = False
# debug = True
buttonDebug = False
# buttonDebug = True
buttonPressed = 0
trigger = threading.Event()
dataMap = {}
def newLine(self, previousText):
if self.debug == False: self.ser.write("\x0D")
# if self.debug == False: self.ser.write(" " * (20 - len(previousText)))
def display(self, raw_text):
text_array = textwrap.wrap(raw_text, 18)
i = 0
while i < len(text_array) and i < 4: # max 4 lines
text = text_array[i]
print text
# try send to serial
if self.debug == False: self.ser.write(text.encode())
self.newLine(text)
i += 1
def newLCDPage(self):
print("============== NEW PAGE =================")
if self.debug == False: self.ser.write("\xFE\x58")
def buttonOnePressed(self, num):
self.buttonPressed = 1
self.trigger.set()
def buttonTwoPressed(self, num):
self.buttonPressed = 2
self.trigger.set()
def buttonThreePressed(self, num):
self.buttonPressed = 3
self.trigger.set()
def get_choice(self):
if self.buttonDebug == False:
self.trigger.clear()
self.trigger.wait()
return self.buttonPressed
else:
return input("") # change this to receive input from buttons on parking machine
# def check_print_cut(self):
# result = subprocess.check_output(['lpstat', '-o'])
# while result.find("1st"):
# time.sleep(0.5)
# print("pulsing cut")
# sys.stdout.flush()
# GPIO.output(PRINTER_GPIO, GPIO.LOW) # cut
def sleep_state(self):
print "ENTERING SLEEP STATE"
sys.stdout.flush()
choice = self.get_choice()
# initially wake up screen if any button is pressed
self.welcome_state()
def welcome_state(self):
print "ENTERING WELCOME STATE"
if self.debug == False: self.ser.write("\xFE\x42")
self.newLCDPage()
print "============================================="
self.display("Welcome to the Open City Project! Sharing sweet things to do")
print "============================================="
sys.stdout.flush()
choice = self.get_choice()
if choice == button["IDEA"] or choice == button["START"]:
startPointer = random.randint(0, len(self.dataMap.get("items"))-1)
self.idea_state(startPointer)
else:
self.welcome_state()
def idea_state(self, pointer):
print "ENTERING IDEA STATE"
self.newLCDPage()
# get ideas from json db
poi_list = self.dataMap.get("items")
# poi_list = [{"name": "Bebop - light sculpture by Bill Culbert"}, {"name": "Garden next to Peacock Fountain"}, {"name": "Kate Sheppard Memorial to Women's Suffrage"}] # mock response for now
self.display(poi_list[pointer].get("title"))
sys.stdout.flush()
nextPointer = pointer + 1
if nextPointer >= len(poi_list):
nextPointer = 0
choice = self.get_choice()
if choice == button["IDEA"]:
self.idea_state(nextPointer)
elif choice == button["PRINT"]:
self.print_ticket(poi_list[pointer])
self.welcome_state()
else:
self.welcome_state()
def print_ticket(self, poi):
self.newLCDPage()
self.display("Printing your mission...")
self.display("Grab it from the slot below!")
if self.debug == False:
# start checking print queue
# t1 = threading.Thread(target=self.check_print_cut)
# t1.start()
self.printer.wake() # Call wake() before printing again, even if reset
self.printer.setDefault() # Restore printer to defaults
self.printer.println("\x1B\x37\x09\x78\02") # set darkness ESC 7 (DP-58C-V2.1-specification)
## centre all text - initially small size
self.printer.justify('C')
self.printer.setSize('S')
## print logo bitmap
import gfx.logo as logo
self.printer.printBitmap(logo.width, logo.height, logo.data)
self.printer.feed(2)
# self.printer.println("{0}'s sweet free thing is at {1}".format("Bob", "1 Queen Street"))
## first_name, suburb - small bold
self.printer.boldOn()
self.printer.println(textwrap.fill("{0} from {1} said: ".format(poi.get("first_name"), poi.get("suburb")),32))
self.printer.boldOff()
self.printer.feed(1)
## title - large
self.printer.setSize('L') # Set type size, accepts 'S', 'M', 'L'
self.printer.println(textwrap.fill(poi.get("title"), 16))
self.printer.feed(1)
## what_makes_it_awesome - normal
self.printer.setSize('S')
self.printer.println(textwrap.fill(poi.get("what_makes_it_awesome"), 32))
self.printer.feed(2)
## small bold
self.printer.boldOn()
self.printer.println("Where is it?")
self.printer.boldOff()
self.printer.feed(1)
## address
self.printer.println(textwrap.fill(poi.get("address"),32))
self.printer.feed(1)
## how to find
self.printer.println(textwrap.fill(poi.get("how_to_find"), 32))
self.printer.feed(2)
self.printer.println("Distance away: " + poi.get("distance")) # distance
self.printer.println("Time required: " + poi.get("how_long_to_allow")) # how_long_to_allow
self.printer.println("Wellbeing: " + poi.get("which_5_way")) # which_5_way
self.printer.println("Best for: " + poi.get("for_kids")) # for_kids
self.printer.feed(10)
self.printer.println("\x1B\x69") # ESC for cutting
self.printer.setDefault() # Restore printer to defaults
self.printer.sleep() # Tell printer to sleep
# t1.join()
# log
with open("log.txt", "a") as log:
log.write(str(datetime.now()) + " - " + poi.get("title") + "\n")
def start(self):
if self.buttonDebug == False: GPIO.add_event_detect(25, GPIO.RISING, callback=self.buttonOnePressed)
if self.buttonDebug == False: GPIO.add_event_detect(17, GPIO.RISING, callback=self.buttonTwoPressed)
if self.buttonDebug == False: GPIO.add_event_detect(23, GPIO.RISING, callback=self.buttonThreePressed)
# read json file
# date = datetime.datetime.now().strftime ("%Y_%m_%d")
with open("data/data.json", 'r') as file:
data=file.read().replace('\n', '')
self.dataMap = json.loads(data)
try:
print "Note: Set debug=False and uncomment import lines when testing on real rpi"
print "=============================================="
print "For cmd line testing, please type one of the keys below, then hit enter:"
print "Key: '1' = START button"
print "Key: '2' = IDEA Button"
print "Key: '3' = PRINT Button"
print "Press any of these to start (LCD backlight should be off until button pressed)"
print "=============================================="
sys.stdout.flush()
if self.debug == False: self.printer = Adafruit_Thermal("/dev/ttyUSB0", 19200, timeout=5)
if self.debug == False: self.printer.setDefault()
if self.debug == False: self.ser = serial.Serial('/dev/ttyACM0', 115200)
## CONTRAST AND BRIGHTNESS
# set contrast to 230 (0xE6)
if self.debug == False: self.ser.write("\xFE\x50\xE6")
# set brightness to 100 (0x64)
# if self.debug == False: self.ser.write("\xFE\x99\x64")
self.sleep_state()
except KeyboardInterrupt, Exception:
print ("ctrl c pressed")
self.newLCDPage()
if self.debug == False: self.ser.write("\xFE\x46")
if self.debug == False: self.ser.close()
if self.debug == False: GPIO.cleanup()# clean up GPIO
print ("Program exiting normally")
self.newLCDPage()
if self.debug == False: self.ser.write("\xFE\x46")
if self.debug == False: self.ser.close()
if self.debug == False: GPIO.cleanup()# clean up GPIO
instance = ParkingMeter()
instance.start()