lcdsmart

deskclock.py

from gpiozero import MCP3008, LED, Button
from time import localtime, sleep
from lcddriver import lcd
from json import load
from os import getcwd
from os.path import join
from pyowm import OWM
            
print("-------------------------------------------------------------")
print("-------------------------------------------------------------")
print("DeskClockPi v0.1")
print("'A smart clock in a cardboard box'")
print("-------------------------------------------------------------")
print("-------------------------------------------------------------")
altIndex = 0
led = LED(17)
button = Button(27)
display = lcd()
display.lcd_clear()
display.lcd_display_string("DeskClockPi", 1)
display.lcd_display_string("Now loading...", 2)
owm = OWM("cc2dbc8e660e2dd27440b3abdb90e335")
refreshedHour= 0
refreshFirst = True
weather = None

def poweroff():
    led.off()
    display.lcd_clear()
    display.lcd_display_string("Powered off!", 1)
    exit()

def addindex():
    global altIndex
    if altIndex < 2:
        altIndex += 1
    elif altIndex >= 2:
        altIndex = 0

button.when_pressed = poweroff
led.on()

while True:
    lcTime = localtime()
    formattedTime = None
    display.lcd_clear()
    if len(str(lcTime.tm_hour)) < 2:
        formattedTime = str(0)+str(lcTime.tm_hour)
    else:
        formattedTime = str(lcTime.tm_hour)
    formattedTime = formattedTime+":"
    if len(str(lcTime.tm_min)) < 2:
        formattedTime = formattedTime+str(0)+str(lcTime.tm_min)
    else:
        formattedTime = formattedTime+str(lcTime.tm_min)
    formattedTime = formattedTime+" "
    if len(str(lcTime.tm_mday)) < 2:
        formattedTime = formattedTime+str(0)+str(lcTime.tm_mday)
    else:
        formattedTime = formattedTime+str(lcTime.tm_mday)
    formattedTime = formattedTime+"/"
    if len(str(lcTime.tm_mon)) < 2:
        formattedTime = formattedTime+str(0)+str(lcTime.tm_mon)
    else:
        formattedTime = formattedTime+str(lcTime.tm_mon)
    formattedTime = formattedTime+"/"+str(lcTime.tm_year)
    display.lcd_display_string(formattedTime, 1)
    if altIndex == 0:
        display.lcd_display_string("In. Temp: "+str(round(MCP3008(0).value*330/1023*1000, 1))+chr(223)+"C", 2)
    elif altIndex == 1:
        calendarjson = load(open(join(getcwd(), "calendar.json"), 'r'))
        if calendarjson["events"]:
            for events in calendarjson["events"]:
                if calendarjson["events"][events]["eventDate"] == formattedTime.split(" ")[1]:
                    display.lcd_display_string(events, 2)
                else:
                    display.lcd_display_string("No events today", 2)
                sleep(5)
        else:
            display.lcd_display_string("No events today", 2)
        del calendarjson
    elif altIndex == 2:
        if not refreshedHour:
            refreshedHour = lcTime.tm_hour
        if refreshFirst:
            weather = str(owm.weather_at_place('Kuala Lumpur,MY').get_weather().get_status())
            refreshFirst = False
        elif refreshedHour < lcTime.tm_hour+2:
            weather = str(owm.weather_at_place('Kuala Lumpur,MY').get_weather().get_status())
        display.lcd_display_string("Outside: "+weather, 2)
    addindex()
    del lcTime
    del formattedTime
    sleep(5)

deskclockServer.py

from flask import Flask, jsonify, make_response, request, abort
from json import dump, load
from os import getcwd
from os.path import isfile, join
from gpiozero import MCP3008

calendarjson = {"events": {}}
if not isfile(join(getcwd(), "calendar.json")):
    dump(calendarjson, open(join(getcwd(), "calendar.json"), 'w+'))
calendarjson = load(open(join(getcwd(), "calendar.json"), 'r'))
app = Flask(__name__)

@app.route("/calendar", methods=["POST"])
def processrequest():
    try:
        if request.json["method"] == "add":
            if not request.json["params"]["eventName"] in calendarjson["events"]:
                calendarjson["events"][request.json["params"]["eventName"]] = {"eventTime": request.json["params"]["eventTime"],
                                                                               "eventDate": request.json["params"]["eventDate"]}
                dump(calendarjson, open(join(getcwd(), "calendar.json"), 'w'))
                return make_response(jsonify({"status": "OK"}), 200)
            else:
                return make_response(jsonify({"error:logic": "Event already exists!"}), 400)
        elif request.json["method"] == "delete":
            if request.json["params"]["eventName"] in calendarjson["events"]:
                del calendarjson["events"][request.json["params"]["eventName"]]
                dump(calendarjson, open(join(getcwd(), "calendar.json"), 'w'))
                return make_response(jsonify({"status": "OK"}), 200)
            else:
                return make_response(jsonify({"error:logic": "Event doesn't exist yet!"}), 400)
        elif request.json["method"] == "list":
            return make_response(jsonify({"status": "OK", "events": calendarjson["events"]}), 200) 
        else:
            return make_response(jsonify({"error:logic": "Method doesn't exist!"}))
    except Exception as e:
        return make_response(jsonify({"error:python": str(e)}), 400)
        

@app.route("/temperature", methods=["GET"])
def gettemperature():
    return make_response(jsonify({"temperature": MCP3008(0).value*330/1023*1000}), 200)

if __name__ == "__main__":
    app.run(host='0.0.0.0')

lcddriver.py

# -*- coding: utf-8 -*-
# Original code found at:
# https://gist.github.com/DenisFromHR/cc863375a6e19dce359d

# http://www.circuitbasics.com/raspberry-pi-i2c-lcd-set-up-and-programming/

"""
Compiled, mashed and generally mutilated 2014-2015 by Denis Pleic
Made available under GNU GENERAL PUBLIC LICENSE

# Modified Python I2C library for Raspberry Pi
# as found on http://www.recantha.co.uk/blog/?p=4849
# Joined existing 'i2c_lib.py' and 'lcddriver.py' into a single library
# added bits and pieces from various sources
# By DenisFromHR (Denis Pleic)
# 2015-02-10, ver 0.1

"""

# i2c bus (0 -- original Pi, 1 -- Rev 2 Pi)
I2CBUS = 1

# LCD Address
ADDRESS = 0x27

import smbus
from time import sleep

class i2c_device:
   def __init__(self, addr, port=I2CBUS):
      self.addr = addr
      self.bus = smbus.SMBus(port)

# Write a single command
   def write_cmd(self, cmd):
      self.bus.write_byte(self.addr, cmd)
      sleep(0.0001)

# Write a command and argument
   def write_cmd_arg(self, cmd, data):
      self.bus.write_byte_data(self.addr, cmd, data)
      sleep(0.0001)

# Write a block of data
   def write_block_data(self, cmd, data):
      self.bus.write_block_data(self.addr, cmd, data)
      sleep(0.0001)

# Read a single byte
   def read(self):
      return self.bus.read_byte(self.addr)

# Read
   def read_data(self, cmd):
      return self.bus.read_byte_data(self.addr, cmd)

# Read a block of data
   def read_block_data(self, cmd):
      return self.bus.read_block_data(self.addr, cmd)


# commands
LCD_CLEARDISPLAY = 0x01
LCD_RETURNHOME = 0x02
LCD_ENTRYMODESET = 0x04
LCD_DISPLAYCONTROL = 0x08
LCD_CURSORSHIFT = 0x10
LCD_FUNCTIONSET = 0x20
LCD_SETCGRAMADDR = 0x40
LCD_SETDDRAMADDR = 0x80

# flags for display entry mode
LCD_ENTRYRIGHT = 0x00
LCD_ENTRYLEFT = 0x02
LCD_ENTRYSHIFTINCREMENT = 0x01
LCD_ENTRYSHIFTDECREMENT = 0x00

# flags for display on/off control
LCD_DISPLAYON = 0x04
LCD_DISPLAYOFF = 0x00
LCD_CURSORON = 0x02
LCD_CURSOROFF = 0x00
LCD_BLINKON = 0x01
LCD_BLINKOFF = 0x00

# flags for display/cursor shift
LCD_DISPLAYMOVE = 0x08
LCD_CURSORMOVE = 0x00
LCD_MOVERIGHT = 0x04
LCD_MOVELEFT = 0x00

# flags for function set
LCD_8BITMODE = 0x10
LCD_4BITMODE = 0x00
LCD_2LINE = 0x08
LCD_1LINE = 0x00
LCD_5x10DOTS = 0x04
LCD_5x8DOTS = 0x00

# flags for backlight control
LCD_BACKLIGHT = 0x08
LCD_NOBACKLIGHT = 0x00

En = 0b00000100 # Enable bit
Rw = 0b00000010 # Read/Write bit
Rs = 0b00000001 # Register select bit

class lcd:
   #initializes objects and lcd
   def __init__(self):
      self.lcd_device = i2c_device(ADDRESS)

      self.lcd_write(0x03)
      self.lcd_write(0x03)
      self.lcd_write(0x03)
      self.lcd_write(0x02)

      self.lcd_write(LCD_FUNCTIONSET | LCD_2LINE | LCD_5x8DOTS | LCD_4BITMODE)
      self.lcd_write(LCD_DISPLAYCONTROL | LCD_DISPLAYON)
      self.lcd_write(LCD_CLEARDISPLAY)
      self.lcd_write(LCD_ENTRYMODESET | LCD_ENTRYLEFT)
      sleep(0.2)


   # clocks EN to latch command
   def lcd_strobe(self, data):
      self.lcd_device.write_cmd(data | En | LCD_BACKLIGHT)
      sleep(.0005)
      self.lcd_device.write_cmd(((data & ~En) | LCD_BACKLIGHT))
      sleep(.0001)

   def lcd_write_four_bits(self, data):
      self.lcd_device.write_cmd(data | LCD_BACKLIGHT)
      self.lcd_strobe(data)

   # write a command to lcd
   def lcd_write(self, cmd, mode=0):
      self.lcd_write_four_bits(mode | (cmd & 0xF0))
      self.lcd_write_four_bits(mode | ((cmd << 4) & 0xF0))

   # write a character to lcd (or character rom) 0x09: backlight | RS=DR<
   # works!
   def lcd_write_char(self, charvalue, mode=1):
      self.lcd_write_four_bits(mode | (charvalue & 0xF0))
      self.lcd_write_four_bits(mode | ((charvalue << 4) & 0xF0))
  
   # put string function with optional char positioning
   def lcd_display_string(self, string, line=1, pos=0):
    if line == 1:
      pos_new = pos
    elif line == 2:
      pos_new = 0x40 + pos
    elif line == 3:
      pos_new = 0x14 + pos
    elif line == 4:
      pos_new = 0x54 + pos

    self.lcd_write(0x80 + pos_new)

    for char in string:
      self.lcd_write(ord(char), Rs)

   # clear lcd and set to home
   def lcd_clear(self):
      self.lcd_write(LCD_CLEARDISPLAY)
      self.lcd_write(LCD_RETURNHOME)

   # define backlight on/off (lcd.backlight(1); off= lcd.backlight(0)
   def backlight(self, state): # for state, 1 = on, 0 = off
      if state == 1:
         self.lcd_device.write_cmd(LCD_BACKLIGHT)
      elif state == 0:
         self.lcd_device.write_cmd(LCD_NOBACKLIGHT)

   # add custom characters (0 - 7)
   def lcd_load_custom_chars(self, fontdata):
      self.lcd_write(0x40);
      for char in fontdata:
         for line in char:
            self.lcd_write_char(line)