[PYTHON] It's getting cold, so I tried to make it possible to turn on / off the AC heater automatically with Raspberry Pi!

Purpose: I tried turning the heater on and off with the Raspberry Pi!

Recently, it has become cold and it has become a difficult season for poor circulation. Therefore, I implemented IoT that turns on the heater when it reaches a certain temperature and turns it off when it gets warm to some extent.

What you have prepared

• Raspberry Pi 3 Model B+ -Temperature sensor
• SSR -Heater --AC power plug (The power plug for inserting the SSR is the one that was in the house.)

setup

-I quoted from GitHub.

• https://github.com/szazo/DHT11_Python
  The reason for bringing it is that you only have to rewrite one program.
  --First, install the sample program on *** Raspberry Pi. ***
  Make sure GitHub is included / or install
  

  sudo apt-get install git

--Sample python program installation

  git clone https://github.com/szazo/DHT11_Python.git

circuit diagram

――I liken it to someone who has nothing to do with the temperature sensor. sorry. --From the right (*** GND, PIN to read the sensor value, 5V ***) --The Heater is AC, so you can just connect it to the SSR and stab it into the power strip. ―― *** * If you make a mistake in the circuit, the temperature sensor will become extremely hot. Please be careful. *** ***

Program (Python)

-I used Python3.
You can just quote dht11_example.py in DHT11_Python.
This time, I made this program.

dht11_example.py

# coding: utf-8
import RPi.GPIO as GPIO
import dht11
import time
import datetime

# initialize GPIO
GPIO.setwarnings(False)
#Declared to specify by GBCM number
GPIO.setmode(GPIO.BCM)
#Set pin 17 of BCM to output
GPIO.setup(17,GPIO.OUT)

# read data using pin 14
instance = dht11.DHT11(pin=14)
HotTemp = 20
ColdTemp = 5
sleepSecond = 0

try:
    while True:
        result = instance.read()
        if result.is_valid():
            tmp = result.temperature
            print(tmp)
            if tmp <= ColdTemp:
                # Heater running
                GPIO.output(17,1)
                print("Heater ON")
                sleepSecond = 10
            elif tmp >= HotTemp:
                # Heater stop
                GPIO.output(17,0)
                print("Heater OFF")
                sleepSecond = 10
            else :
                time.sleep(sleepSecond)

except KeyboardInterrupt:
        GPIO.cleanup()

*** I think it's a very easy-to-understand program. *** ***

Implementation

Let's implement it for the time being!

sudo python3 dht11_example.py 

*** Did it work? *** ***

If it's not working

--Try adding *** as GPIO *** to the first part of dht11.py of DHT11.

dht11.py

import time
#Add as GPIO to import RPi
import RPi as GPIO

class DHT11Result:
    'DHT11 sensor result returned by DHT11.read() method'

    ERR_NO_ERROR = 0
    ERR_MISSING_DATA = 1
    ERR_CRC = 2