Show the current time and temperature of the Raspberry Pi using Adafruit_Nokia_LCD

temp.py

# Author: Daniel Lemos  
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import time
import subprocess
from datetime import datetime

import Adafruit_Nokia_LCD as LCD
import Adafruit_GPIO.SPI as SPI

from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont


# Raspberry Pi hardware SPI config:
DC = 23
RST = 24
SPI_PORT = 0
SPI_DEVICE = 0

# Raspberry Pi software SPI config:
# SCLK = 4
# DIN = 17
# DC = 23
# RST = 24
# CS = 8

# Beaglebone Black hardware SPI config:
# DC = 'P9_15'
# RST = 'P9_12'
# SPI_PORT = 1
# SPI_DEVICE = 0

# Beaglebone Black software SPI config:
# DC = 'P9_15'
# RST = 'P9_12'
# SCLK = 'P8_7'
# DIN = 'P8_9'
# CS = 'P8_11'


# Hardware SPI usage:
disp = LCD.PCD8544(DC, RST, spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE, max_speed_hz=4000000))

# Software SPI usage (defaults to bit-bang SPI interface):
#disp = LCD.PCD8544(DC, RST, SCLK, DIN, CS)

# Initialize library.
disp.begin(contrast=60)


# Clear display.
disp.clear()
disp.display()

# Create blank image for drawing.
# Make sure to create image with mode '1' for 1-bit color.
image = Image.new('1', (LCD.LCDWIDTH, LCD.LCDHEIGHT))

# Get drawing object to draw on image.
draw = ImageDraw.Draw(image)

try:
	# Alternatively load a TTF font.
	temp_font = ImageFont.truetype('/usr/share/fonts/TTF/DroidSans.ttf', 26)
	time_font = ImageFont.truetype('/usr/share/fonts/TTF/DroidSans.ttf', 18)
except:	
	# Load default font.
	temp_font = ImageFont.load_default()
	time_font = ImageFont.load_default()


temp_font_width, temp_font_height = draw.textsize('xx.xoC', font=temp_font)
time_font_width, time_font_height = draw.textsize('00:00:00', font=time_font)

print 'Press Ctrl-C to quit.'
while True:
	p = subprocess.Popen(['/opt/vc/bin/vcgencmd', 'measure_temp'], stdout=subprocess.PIPE)
 	out, err = p.communicate()
	if not err:
		temp = out.replace("'", u'\u00B0').split('=')[1][:-1]
		# Draw a white filled box to clear the image.
		draw.rectangle((0,0,LCD.LCDWIDTH,LCD.LCDHEIGHT), outline=255, fill=255)

		draw.text(((LCD.LCDWIDTH - temp_font_width) /2, -2), temp, font=temp_font)
		draw.text(((LCD.LCDWIDTH - time_font_width) /2, ((LCD.LCDHEIGHT - time_font_height) / 6) * 5), datetime.now().strftime('%H:%M:%S'), font=time_font)

		# Display image.
		disp.image(image)
		disp.display()
	time.sleep(1.0)