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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Module managing temperature in the shroombox.
"""
from os import getpid
import pigpio
from math import isnan
import logging
import time
from simple_pid import PID
__author__ = "Franek Łazarewicz-Muradyan"
__licence__ = "GPL"
__version__ = "0.0.1"
__status__ = "Proof of concept"
# **********************
# Hardware Settings
# **********************
# One wire temperature sensor settings
w1_sensor_id = '28-0517c1b121ff'
w1_sensor_f = f'/sys/devices/w1_bus_master1/{w1_sensor_id}/w1_slave'
# Heater settings
relay_pin = 5
mosfet_pin = 22
# **********************
# Software Settings
# **********************
timeformat = '%Y-%M-%d %H:%M:%S'
temperature_min = 20
temperature_max = 24
temperature_target = 20
read_retry = 3
logname = '/var/log/pipi/shroombox.log'
data_file = '/var/log/pipi/shroombox.csv'
# **********************
# PID Settings
# **********************
Kp = 1
Ki = 0.2
Kd = 0
sample_time = 10
# **********************
# Code
# **********************
logging.basicConfig(
filename=logname,
encoding='utf-8',
filemode='a',
format='%(asctime)s,%(msecs)d %(name)s%(levelname)s %(message)s', datefmt='%H:%M:%S',
level=logging.DEBUG,
)
logging.info("Starting shroombox")
logger = logging.getLogger()
def read_temp(
retry: int = 0,
) -> float:
# If sensor is physically disconected, opening file will fail
temperature = float('NaN')
if retry > read_retry:
return temperature
with open(w1_sensor_f, 'r') as sensor:
ok = sensor.readline()[-4:].strip('\n')
if ok == 'YES':
try:
temperature = round(int(sensor.readline().split('=')[1])/1000, 1)
except IndexError: # TODO: What other exceptions?
return temperature
else:
retry += 1
read_temp(retry=retry)
return temperature
def heater_on(
temp: float,
on: bool = False,
) -> bool:
status = pio.read(relay_pin)
timestamp = time.strftime(timeformat)
# turning it off
if not on:
if status == 1:
return False
else:
try:
pio.write(relay_pin, 1)
message = f"Turning off, temp: {temp}, {timestamp}"
logger.info(message)
return False
except: # TODO: documentation doesn't talk about exceptions on write
return True
# turning it on
if on:
if status == 0:
return False
else:
try:
pio.write(relay_pin, 0)
message = f"Turning on, temp: {temp}, {timestamp}"
logger.info(message)
return False
except:
return True
def temp_control(
current_temperature: float
) -> int:
pid = PID(Kp, Ki, Kd, setpoint=temperature_target)
pid.output_limits = (0, 255)
pid.sample_time = sample_time
return pid(current_temperature)
def main_alt():
temp = read_temp_alt()
timestamp = time.strftime(timeformat)
print(temp)
with open(data_file, 'a') as dat:
dat.write(temp)
frequency = temp_control(temp)
try:
pio.set_PWM_frequency(mosfet_pin, frequency)
except (
pio.PI_BAD_USER_GPIO,
pio.PI_NOT_PERMITTED,
) as exc:
logger.warning(f"Failed to set GPIO PWM frequency: {exc} {timestamp}")
def main():
temp = read_temp()
timestamp = time.strftime(timeformat)
print(temp)
if temp <= temperature_min:
# if temp < temperature_min - 5:
# print(f"Heater doesn't work, battery empty?")
# logger.warning(f"Heater doesn't work, battery empty?")
# state = heater_on(temp, on=False)
state = heater_on(temp, on=True)
if state != 0:
logger.warning(f"heater_on() method returned {state}, {timestamp}")
elif temp >= temperature_max:
state = heater_on(temp, on=False)
if state != 0:
logger.warning(f"heater_on() method returned {state} {timestamp}")
elif isnan(temp):
state = heater_on(temp, on=False)
logging.warning(f"Cannot read temperature, check your connections! {timestamp}")
if __name__ == '__main__':
with open('/run/shroombox.pid', 'w') as f:
f.write(str(getpid()))
while True:
pio = pigpio.pi()
main()
time.sleep(30)
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