dht_oled.py

#!/usr/bin/python

import Adafruit_DHT
from time import sleep
import os

import time
import Adafruit_GPIO.SPI as SPI
import Adafruit_SSD1306

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

# Raspberry Pi pin configuration:
RST = 24
# Note the following are only used with SPI:
DC = 23
SPI_PORT = 0
SPI_DEVICE = 0

# Note you can change the I2C address by passing an i2c_address parameter like:
# disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST, i2c_address=0x3C)
disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST, i2c_address=0x3C)


# Initialize library.
disp.begin()

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

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

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

# Draw a black filled box to clear the image.
draw.rectangle((0, 0, width, height), outline=0, fill=0)

# Draw some shapes.
# First define some constants to allow easy resizing of shapes.
padding = 2
shape_width = 20
top = padding
bottom = height-padding
# Move left to right keeping track of the current x position for drawing shapes.
x = padding


# Load default font.
font = ImageFont.load_default()
font18 = ImageFont.truetype('Minecraftia.ttf', 18)
font20 = ImageFont.truetype('Minecraftia.ttf', 20)
font24 = ImageFont.truetype('Minecraftia.ttf', 24)

# Alternatively load a TTF font.  Make sure the .ttf font file is in the same directory as the python script!
# Some other nice fonts to try: http://www.dafont.com/bitmap.php
#font = ImageFont.truetype('Minecraftia.ttf', 8)

# Write two lines of text.
draw.text((x, top),    'Raspberry Pi',  font=font, fill=255)
draw.text((x, top+18), 'DHTxx', font=font24, fill=255)


# Display image.
disp.image(image)
disp.display()

# Sensor should be set to Adafruit_DHT.DHT11,
# Adafruit_DHT.DHT22, or Adafruit_DHT.AM2302.
sensor = Adafruit_DHT.AM2302

# Example using a Beaglebone Black with DHT sensor
# connected to pin P8_11.
pin = 4

# Try to grab a sensor reading.  Use the read_retry method which will retry up
# to 15 times to get a sensor reading (waiting 2 seconds between each retry).


while True:
    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
    if humidity is not None and temperature is not None:
        sleep(5)
        temperature = round(1.8*temperature+32, 2)
        str_temp = ' {0:0.2f} *F '.format(temperature)
        str_hum = ' {0:0.2f} %'.format(humidity)
        print('Temp={0:0.1f}*F  Humidity={1:0.1f}%'.format(temperature, humidity))
        draw.rectangle((0, 0, width, height), outline=0, fill=0)
        # disp.clear()
        # disp.display()
        draw.text((3, top),    ' Temperature / Humidity',  font=font, fill=255)
        draw.text((x, top+16), str_temp, font=font18, fill=255)
        draw.text((x, top+36), str_hum, font=font18, fill=255)
        disp.image(image)
        disp.display()
    else:
        print('Failed to get reading. Try again!')
        sleep(10)