/
poemsMainPrintAll.py
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/
poemsMainPrintAll.py
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#!/usr/bin/python
# script for poemBot raspberry pi 2 + printer.
# originally developed to promote Vandal Poem of the Day
# http://poetry.lib.uidaho.edu/
# this version prints a selection from the Golden Treasury (1861),
# http://www.gutenberg.org/ebooks/19221
# adapted from Adafruit Python-Thermal-Printer main.py
# https://github.com/adafruit/Python-Thermal-Printer
# this script is designed to run on a headless Raspberry Pi connected to a thermal printer
# must be run as sudo
from __future__ import print_function
import RPi.GPIO as GPIO
import subprocess, time, socket, csv, textwrap, random
from thermalPrinter import *
# printer and button set up
ledPin = 18
buttonPin = 23
holdTime = 2 # Duration for button hold (shutdown)
tapTime = 0.01 # Debounce time for button taps
printer = Adafruit_Thermal("/dev/ttyAMA0", 19200, timeout=5)
testPoemCount = 0
# Print random poem, called on tap
def printPoem(poemNum):
#get a random poem
#####randPoem = random.choice(allPoems)
randPoem = allPoems[poemNum]
# nicely wrap the content for the printer
# Title and Author are printed in 'M' medium font, limit is 32 character per line
# poem is printed in 'S' small font, limit is 32 characters per line
# book and publisher are in "fontB", limit is 42 character per line
wrappedTitle = textwrap.fill(randPoem[1], width=32)
wrappedAuthor = textwrap.fill(randPoem[2], width=32)
wrappedPoem = ""
for line in randPoem[3].splitlines():
wrappedLine = textwrap.fill(line, width=32, subsequent_indent=" ")
wrappedPoem += wrappedLine +"\n"
#print the poem on the thermal printer
printer.justify('L')
printer.setSize('M')
printer.println(wrappedTitle)
printer.setSize('S')
printer.println(wrappedPoem)
printer.println(wrappedAuthor)
printer.writeBytes(0x1B, 0x21, 0x1)
printer.println(randPoem[4] +", " + randPoem[0] + ".")
printer.println(' ')
printer.println(' ')
printer.feed(3)
# Called when button is briefly tapped.
# prints a random poem
def tap():
GPIO.output(ledPin, GPIO.HIGH) # LED on while working
printPoem(testPoemCount)
testPoemCount++
GPIO.output(ledPin, GPIO.LOW)
# Called when button is held down.
# prints goodbye, invokes shutdown process.
def hold():
GPIO.output(ledPin, GPIO.HIGH)
printer.println('Goodbye!')
printer.feed(3)
subprocess.call("sync")
subprocess.call(["shutdown", "-h", "now"])
GPIO.output(ledPin, GPIO.LOW)
# Initialization
# Use Broadcom pin numbers (not Raspberry Pi pin numbers) for GPIO
GPIO.setmode(GPIO.BCM)
# Enable LED and button (w/pull-up on latter)
GPIO.setup(ledPin, GPIO.OUT)
GPIO.setup(buttonPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
# LED on while working
GPIO.output(ledPin, GPIO.HIGH)
# Load up all poems from CSV
# poem CSV is structured with the columns: number,title,author,poem,book
# goldenTreasuryPoems.csv was parsed from the text of Project Gutenberg EBook #19221
# http://www.gutenberg.org/ebooks/19221
# the poem column contains the full text of the poem with no markup, only \n
# the CSV is in PC437 encoding since the printer only supports this character set
with open('goldenTreasuryPoems.csv') as csvPoems:
allPoems = list(csv.reader(csvPoems, delimiter=','))
# Processor load is heavy at startup;
# this delays starting the loop for a bit
time.sleep(30)
# Print IP address if Pi connects to a network
# added blank println because printer adds some test characters when starting up
try:
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(('8.8.8.8', 0))
printer.println(' ')
printer.println('poemBot is at ' + s.getsockname()[0])
printer.feed(3)
except:
printer.println(' ')
printer.println('poemBot is not connected.')
printer.feed(3)
# Print greeting
printer.println('Hello!')
printer.println('Ready to print Golden Treasury poems.')
printer.feed(3)
GPIO.output(ledPin, GPIO.LOW)
# Poll initial button state and time
prevButtonState = GPIO.input(buttonPin)
prevTime = time.time()
tapEnable = False
holdEnable = False
# Main loop
while(True):
# Poll current button state and time
buttonState = GPIO.input(buttonPin)
t = time.time()
# Has button state changed?
if buttonState != prevButtonState:
prevButtonState = buttonState # Yes, save new state/time
prevTime = t
else: # Button state unchanged
if (t - prevTime) >= holdTime: # Button held more than 'holdTime'?
# Yes it has. Is the hold action as-yet untriggered?
if holdEnable == True: # Yep!
hold() # Perform hold action (usu. shutdown)
holdEnable = False # 1 shot...don't repeat hold action
tapEnable = False # Don't do tap action on release
elif (t - prevTime) >= tapTime: # Not holdTime. tapTime elapsed?
# Yes. Debounced press or release...
if buttonState == True: # Button released?
if tapEnable == True: # Ignore if prior hold()
tap() # Tap triggered (button released)
tapEnable = False # Disable tap and hold
holdEnable = False
else: # Button pressed
tapEnable = True # Enable tap and hold actions
holdEnable = True
# LED blinks while idle, for a brief interval every 2 seconds.
# Pin 18 is PWM-capable and a "sleep throb" would be nice, but
# the PWM-related library is a hassle for average users to install
# right now. Might return to this later when it's more accessible.
if ((int(t) & 1) == 0) and ((t - int(t)) < 0.15):
GPIO.output(ledPin, GPIO.HIGH)
else:
GPIO.output(ledPin, GPIO.LOW)