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thermostat.py
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thermostat.py
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from buttonHandler import buttonHandler
from display import displayControl
from heaterControl import heaterControl
from schedule import schedule
from simple_pid import PID
from tempSensorDHT import tempSensor
from tracker import dataTracker
import json
import logging
import os
import threading
import time
class Thermostat:
def __init__(self, pref_file = None, schedule_file = None,
runhistory_file = None, activitydata_file = None,
tempdata_file = None, update_frequency = 60.0,
downbuttons = ["F11"], upbuttons = ["F12"]):
self.updatelock = threading.Condition()
self.thread = None
self.update = False
self.state_dirty = False
self.next_check_time = time.time()
self.period = update_frequency
self.enabled = 0
self.pid = PID(1.0, 0.0, 0.0, setpoint=70, output_limits=(0.0, 1.0))
self.schedule = schedule(save_file=schedule_file)
self.activity_tracker = dataTracker(1, save_file = activitydata_file,
autosave_frequency = 10*60,
age_limit = 24*60*60)
self.pref_file = pref_file
self.loadPrefs()
self.sensor = tempSensor(tempdata_file)
(temp, humidity) = self.sensor.read()
self.display = displayControl()
if self.display != None:
self.display.updateDisplay(temp, self.pid.setpoint, 0.0)
self.downbuttons = [buttonHandler(b, self.decreaseTemp)
for b in downbuttons] if downbuttons else []
self.upbuttons = [buttonHandler(b, self.increaseTemp)
for b in upbuttons] if upbuttons else []
self.control = heaterControl(save_file = runhistory_file,
display = self.display)
self.to_delete = False
self.thread = threading.Thread(target=self.thermostatThread)
self.thread.daemon = True
self.thread.start()
def __del__(self):
self.updatelock.acquire()
self.to_delete = True
# Abuses evaluation order to join right before the is_alive check
while (self.thread and not self.thread.join(0) and
self.thread.is_alive()):
self.updatelock.notify()
self.updatelock.wait()
self.updatelock.release()
def getTargetTemp(self):
return self.pid.setpoint
def setTargetTemp(self, val):
if self.pid.setpoint == val:
return
logging.info("Updating new target temp from %f to %f"
% (self.pid.setpoint, val))
self.pid.setpoint = val
self.state_dirty = True
def increaseTemp(self, amount=1.0):
self.pid.setpoint += amount
self.state_dirty = True
self.updateState()
def decreaseTemp(self, amount=1.0):
self.pid.setpoint -= amount
self.state_dirty = True
self.updateState()
def getStatus(self):
return self.control.getLevel()
def getCurRuntime(self):
return self.control.getCurRuntime()
def getPastRuntimes(self, days=None, skip=None, start_day=None):
return self.control.getPastRuntimes(days, skip, start_day)
def saveRunHistory(self):
return self.control.saveHistory()
def getSensorHistory(self, start_time = None, end_time = None,
stride = None, bin_count = None):
return self.sensor.tracker.getData(start_time, end_time,
stride, bin_count)
def getActivityHistory(self, start_time = None, end_time = None,
stride = None, bin_count = None):
return self.activity_tracker.getData(start_time, end_time,
stride, bin_count)
def saveDataFiles(self):
return (self.sensor.tracker.save() and
self.activity_tracker.save())
def getEnabled(self):
return self.enabled
def setEnabled(self, val):
val = min(max(int(val),0),2)
self.enabled = val
def getTunings(self):
return self.pid.tunings
def setTunings(self, Kp, Ki, Kd):
self.pid.tunings = (Kp, Ki, Kd)
def getLastReading(self):
return self.sensor.mostRecent()
def getWaitTime(self, cur_time = None, default = 5.0):
self.updatelock.acquire()
if cur_time == None:
cur_time = time.time()
next_check_time = self.next_check_time
self.updatelock.release()
if cur_time >= next_check_time:
return default
return next_check_time - cur_time
def thermostatThread(self):
temp = None
humidity = None
self.updatelock.acquire()
while not self.to_delete:
logging.info("Checking thermostat...")
cur_time = time.time()
woken = True
while cur_time > self.next_check_time:
woken = False
self.next_check_time += self.period
self.update = False
self.updatelock.release()
scheduled_temp = self.schedule.checkForUpdate()
if scheduled_temp != None:
self.setTargetTemp(scheduled_temp)
if not woken:
(temp, humidity) = self.sensor.read(cur_time)
status = 0
if (self.enabled == 2):
status = 1
elif (self.enabled == 1):
if temp != None:
status = self.pid(temp)
self.control.setLevel(status)
self.activity_tracker.record(cur_time, status)
if self.display != None:
self.display.updateDisplay(temp, self.pid.setpoint, status)
if self.state_dirty and not self.update:
self.savePrefs()
self.updatelock.acquire()
if not self.update:
cur_time = time.time()
if cur_time < self.next_check_time:
self.updatelock.notify()
self.updatelock.wait(self.next_check_time - cur_time)
self.updatelock.notify()
self.updatelock.release()
def updateState(self, block=False):
self.updatelock.acquire()
self.update = True
self.updatelock.notify()
if block:
self.updatelock.wait()
self.updatelock.release()
def savePrefs(self, filename=None):
if filename == None:
filename = self.pref_file
if filename == None:
return False
success = True
logging.debug("Writing prefs to %s" % filename)
directory = os.path.dirname(filename)
if not os.path.isdir(directory):
try:
os.makedirs(directory)
except Exception as err:
logging.error("Could not create directory %s: %s"
% (directory, err))
self.state_dirty = False
prefs_dict = {"temp" : self.pid.setpoint,
"state" : self.enabled,
"pid" : self.pid.tunings}
try:
fp = open(filename, "w")
json.dump(prefs_dict, fp)
fp.close()
except Exception as err:
logging.error("Could not create file %s: %s" % (filename, err))
success = False
return success
def loadPrefs(self, filename=None):
if filename == None:
filename = self.pref_file
new_temp = None
if filename:
if os.path.exists(filename):
prefs_dict = {}
try:
fp = open(filename, "r")
prefs_dict = json.load(fp)
fp.close()
except Exception as err:
logging.error("Could note load prefs from %s: %s"
% (filename, err))
if not isinstance(prefs_dict, dict):
logging.error(
"Prefences loaded from %s invalid, discarding"
% filename)
else:
if ("state" in prefs_dict and
prefs_dict["state"] in [0, 1, 2]):
self.enabled = prefs_dict["state"]
if ("temp" in prefs_dict and
isinstance(prefs_dict["temp"], (float, int))):
new_temp = prefs_dict["temp"]
if "pid" in prefs_dict:
self.pid.tunings = prefs_dict["pid"]
else:
logging.warning(
"Prefs file %s does not exist, attempting to create..."
% filename)
if self.savePrefs(filename):
logging.warning("Creating %s successful" % filename)
else:
logging.error("Creating pref file %s failed !!"
% filename)
if new_temp == None:
new_temp = self.schedule.mostRecentTemp()
if new_temp != None:
self.pid.setpoint = new_temp