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dht_on_lcd.py
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dht_on_lcd.py
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#!/usr/bin/python
# Author: Christoph Zimmermann
# Based on Code from Tony DiCola (Copyright (c) 2014 Adafruit Industries)
# 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 sys
import time
import Adafruit_GPIO.PCF8574 as PCF
from Adafruit_CharLCD import Adafruit_CharLCD
import Adafruit_DHT
# Define type and pin of connected humidity sensor
dht_type = 11
dht_pin = 4
# Define PCF pins connected to the LCD.
lcd_rs = 0
lcd_rw = 1
lcd_en = 2
lcd_backlight = 3
d4,d5,d6,d7 = 4,5,6,7
cols,lines = 16,2
gpio = PCF.PCF8574(address=0x3f)
gpio.setup(lcd_rw, PCF.OUT)
gpio.output(lcd_rw, 0)
# Instantiate LCD Display
lcd = Adafruit_CharLCD(lcd_rs, lcd_en, d4, d5, d6, d7, cols, lines,
lcd_backlight, invert_polarity=False, gpio=gpio)
lcd.clear()
lcd.message('Humidity and\nTemperature')
lcd.set_backlight(1)
while(True):
# 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).
humidity, temperature = Adafruit_DHT.read_retry(dht_type, dht_pin)
# Note that sometimes you won't get a reading and
# the results will be null (because Linux can't
# guarantee the timing of calls to read the sensor).
# If this happens try again!
if humidity is not None and temperature is not None:
print('Temp={0:0.1f}C Humidity={1:0.1f}%'.format(temperature, humidity))
lcd.clear()
lcd.message('Temp={0:0.1f}C\nHumidity={1:0.1f}%'.format(temperature, humidity))
time.sleep(5)