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from abc import ABC, abstractmethod
from queue import circular_queue
import time
import os
# Abstract Class for heating
class heating(ABC):
def __init__(self, db):
self.temperature = 0
self.target = 19
self.on = False
self.db = db
self.queue = circular_queue(20)
def up(self, increase=0.5):
self.target += increase
self.update()
def down(self, decrease=0.5):
self.target -= decrease
self.update()
def update(self):
# rolling average for current temperature
self.queue.add(self.get_temperature())
self.temperature = self.queue.average()
if self.temperature < self.target:
self.on = True
self.turn_on()
else:
self.on = False
self.turn_off()
'''
self.db.exec(
"insert into temperature values (?,?,?,?)",
(date, time, self.temperature, self.target),
)
self.db.exec(
"insert into history values (?,?,?)",
(date, time, heatingon(int)),
)
'''
"""
Abstract methods used so that configuration for different
device types other than a Raspberry Pi is easier in the future
and all other methods can simply be inherited
"""
# Method to turn the heating on
@abstractmethod
def turn_on(self):
pass
# Method to turn the heating off
@abstractmethod
def turn_off(self):
pass
# Method to get the current actual temperature, can be changed for
# different types of temperature sensor when inheriting this
# class
@abstractmethod
def get_temperature(self):
pass
# inherited from heating class
# overriding abstract methods from heating class
class rpi_heating(heating):
def __init__(self,db):
# https://tutorials-raspberrypi.com/raspberry-pi-control-relay-switch-via-gpio/
# https://www.ics.com/blog/gpio-programming-using-sysfs-interface
# https://medium.com/initial-state/how-to-build-a-raspberry-pi-temperature-monitor-8c2f70acaea9
# run init from super class
super().__init__(db)
# constant values
self.RELAY = 17 # relay GPIO pin
self.SENSORID = "28-0621412f1b5a" # serial number of sensor
# setup GPIO for the relay
os.system(
"echo {} >/sys/class/gpio/export".format(self.RELAY)
)
os.system(
"echo out >/sys/class/gpio/gpio{}/direction".format(
self.RELAY
)
)
# file that the temperature gets written t
self.sensor = "/sys/bus/w1/devices/{}/w1_slave".format(
self.SENSORID
)
def turn_on(self):
# turn the heating on by triggering the relay
os.system(
"echo 1 >/sys/class/gpio/gpio{}/value".format(self.RELAY)
)
def turn_off(self):
# turn the heating off by triggering the relay
os.system(
"echo 0 >/sys/class/gpio/gpio{}/value".format(self.RELAY)
)
def get_temperature(self):
with open(self.sensor, "r") as file:
data = file.read()
# parse temperature from file
return (
float(data.split("\n")[1].split(" ")[9].split("=")[1])
/ 1000
)
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