def __init__(self):
# Setup temperature input, control, and history
self.target_temp = self.get_target_temp()
self.therm = thermometer.Thermometer()
self.temp_history = TempHistory(local_config.temp_history_fpath)
self.state = 'normal'
self.last_state_change_time = time.time()
# Setup outputs
GPIO.setmode(local_config.pin_mode)
self.fridge = outputs.OutputObject(local_config.fridge_pin)
if local_config.led_pin is not None:
self.flashingled = outputs.FlashingLED(local_config.led_pin)
self.flashingled.start()
class Fermenter:
def __init__(self):
# Setup temperature input, control, and history
self.target_temp = self.get_target_temp()
self.therm = thermometer.Thermometer()
self.temp_history = TempHistory(local_config.temp_history_fpath)
self.state = 'normal'
self.last_state_change_time = time.time()
# Setup outputs
GPIO.setmode(local_config.pin_mode)
self.fridge = outputs.OutputObject(local_config.fridge_pin)
if local_config.led_pin is not None:
self.flashingled = outputs.FlashingLED(local_config.led_pin)
self.flashingled.start()
def __del__(self):
self.fridge.turn_off()
self.flashingled.stop()
def get_target_temp(self):
""" Reads target temp from file.
Target temp file must contain either a single scalar or the word 'off'.
"""
for line in open('.target_temp'):
temp = line.strip()
if temp == 'off':
return temp
return float(temp)
def run(self):
# Starting main routing
send_email('Starting fermenter at %gF' % self.target_temp)
while True:
self.regulate_and_record_temp()
time.sleep(60)
def regulate_and_record_temp(self):
target_temp = self.get_target_temp()
if target_temp != self.target_temp:
temps = tuple(['off' if t == 'off' else '%gF' % t for t in (self.target_temp, target_temp)])
send_email('Changing temperature from %s to %s' % temps)
self.target_temp = target_temp
try: # try grabbing the current temp
current_temp = self.therm.read_temp()
stat_str = '%.2f (%g)' % (current_temp, self.target_temp)
except: # send an email if you can't
send_email("can't read the temperature")
time.sleep(2)
# deal with target_temp=off
if self.target_temp == 'off':
self.set_state('normal')
if self.fridge.turn_off():
stat_str += ' on->off'
else:
stat_str += ' off'
print stat_str
self.temp_history.add_temp(time.time(), current_temp, -1, self.fridge.is_on())
return
# regulate the temperature:
if current_temp > self.target_temp + 1.0:
if self.fridge.turn_on():
stat_str += ' off->on'
self.set_state('normal')
else:
stat_str += ' on'
if current_temp > self.target_temp + 2.0:
stat_str += '\tWarning: High Temperatures'
self.set_state('high_temp')
elif current_temp < self.target_temp - 0.05:
if self.fridge.turn_off():
stat_str += ' on->off'
self.set_state('normal')
else:
stat_str += ' off'
if current_temp < self.target_temp - 2.0:
stat_str += '\tWarning: Low Temperatures'
self.set_state('low_temp')
else:
if self.fridge.is_on():
stat_str += ' on'
else:
stat_str += ' off'
print stat_str
self.temp_history.add_temp(time.time(), current_temp, self.target_temp, self.fridge.is_on())
def set_state(self, state):
assert state in ['high_temp', 'low_temp', 'normal'], state
if self.state == state == 'normal':
return
elif self.state != state:
self.last_state_change_time = time.time()
self.state = state
if state == 'normal':
subject = 'Returned to Normal Operation'
title = 'State: Normal Operation'
event_times = None
event_labels = None
elif state == 'high_temp':
subject = 'Warning: High Temp'
title = 'State: High Temp'
event_times = [self.last_state_change_time],
event_labels = ['High Temp Begun']
else:
subject = 'Warning: Low Temp'
title = 'State: Low Temp'
event_times = [self.last_state_change_time],
event_labels = ['Low Temp Begun']
# Send updates roughly logarithmically in time for the first day, then once a day
min_since_last_change = int(time.time() - self.last_state_change_time) / 60
times_to_contact = [0, 5, 10, 20] + range(30, 6*60, 30) + range(6*60, 24*60, 60)
if min_since_last_change in times_to_contact or min_since_last_change % (24 * 60) == 0:
# Send email with temp graph since state change and previous 12 hours
start = self.last_state_change_time - 12 * 60 * 60
self.temp_history.plot_temp_history(
start=start,
stop=None,
subject=subject,
title=title,
event_times=event_times,
event_labels=event_labels,
email=True)
