[PYTHON] Updated temperature sensor

Updated temperature sensor! (Purpose)

--Updated from DHT11 to DHT22
After replacing it, I couldn't use it as it was, so I will explain it.
For those who haven't seen the previous article ➡︎ URL

Reference material Make a LINEbot that notifies the temperature with Raspberry Pi 3 + DHT22 ②

What was used

setup

The source code is on GitHub, so I will quote it.
--First, RPi.GPIO installs a module that can control GPIO pins of Raspberry Pi. 

$ sudo apt-get install python-rpi.gpio

--Install the package for the sake of your needs.

$ sudo apt-get install build-essential python-dev

--Install the DHT22 library

$ sudo git clone https://github.com/adafruit/Adafruit_Python_DHT.git

$ cd Adafruit_Python_DHT

$ sudo python setup.py install

circuit diagram

――Same as last time. I'm sorry to quote that.
*** There is one caveat. </ font> *** --It does not start well when 5V is given. (I don't know why)
So, please change to *** 3.3V *** voltage. image.png

Program (Python)

python


# coding: utf-8
import RPi.GPIO as GPIO
import time
import datetime
import MyPyDHT

#Declared to specify by GBCM number
GPIO.setmode(GPIO.BCM)
#Set pin 17 of BCM to output
DHT_PIN = 14 
GPIO.setup(DHT_PIN,GPIO.OUT)
HEATER_PIN = 17 
GPIO.setup(HEATER_PIN,GPIO.OUT) 
HotTemp = 10
ColdTemp = -1
sleepSecond = 0
try:
   while True:
       humidity, temperature = MyPyDHT.sensor_read(MyPyDHT.Sensor.DHT22, DHT_PIN)
       if humidity is not None and temperature is not None:
           tmp = temperature
           print(tmp)
           if tmp <= ColdTemp:
               # Heater running
               GPIO.output(HEATER_PIN,1)
               print("Heater ON")
               sleepSecond = 10
           elif tmp >= HotTemp:
               # Heater stop
               GPIO.output(HEATER_PIN,0)
               print("Heater OFF")
               sleepSecond = 10
           else :
               time.sleep(sleepSecond)
       time.sleep(5)
except KeyboardInterrupt:
       GPIO.cleanup()

*** It's a little different from before. Because it's only a little ***

If it doesn't work

Are you using *** 5V ***? Try replacing it with *** 3.3V ***!