kopia lustrzana https://github.com/botheredbybees/kilnController
193 wiersze
5.9 KiB
Python
193 wiersze
5.9 KiB
Python
import threading,time,random,datetime,logging,json
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import config
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log = logging.getLogger(__name__)
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try:
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from max31855 import MAX31855, MAX31855Error
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sensor_available = True
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except ImportError:
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log.warning("Could not initialize temperature sensor, using dummy values!")
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sensor_available = False
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config.gpio_heat = 11
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config.gpio_cool = 10
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config.gpio_air = 9
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try:
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import RPi.GPIO as GPIO
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GPIO.setmode(GPIO.BCM)
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GPIO.setwarnings(False)
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GPIO.setup(config.gpio_heat, GPIO.OUT)
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GPIO.setup(config.gpio_cool, GPIO.OUT)
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GPIO.setup(config.gpio_air, GPIO.OUT)
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gpio_available = True
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except ImportError:
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log.warning("Could not initialize GPIOs, oven operation will only be simulated!")
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gpio_available = False
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class Oven (threading.Thread):
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STATE_IDLE = "IDLE"
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STATE_RUNNING = "RUNNING"
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def __init__(self):
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threading.Thread.__init__(self)
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self.daemon = True
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self.reset()
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self.temp_sensor = TempSensor(self)
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self.temp_sensor.start()
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self.start()
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def reset(self):
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self.profile = None
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self.start_time = 0
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self.runtime = 0
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self.totaltime = 0
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self.target = 0
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self.state = Oven.STATE_IDLE
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self.set_heat(False)
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self.set_cool(False)
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self.set_air(False)
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def run_profile(self, profile):
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log.info("Running profile %s"%profile.name)
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self.profile = profile
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self.totaltime = profile.get_duration()
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self.state = Oven.STATE_RUNNING
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self.start_time = datetime.datetime.now()
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log.info("Starting")
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def abort_run(self):
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self.reset()
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def run(self):
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while True:
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if self.state == Oven.STATE_RUNNING:
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self.runtime = (datetime.datetime.now() - self.start_time).total_seconds()
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log.info("running at %.1f deg C (Target: %.1f) , heat %.2f, cool %.2f, air %.2f (%.1fs/%.0f)"%(self.temp_sensor.temperature,self.target,self.heat,self.cool,self.air,self.runtime,self.totaltime))
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self.target = self.profile.get_target_temperature(self.runtime)
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if self.profile.is_rising(self.runtime):
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self.set_cool(False)
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self.set_heat(self.temp_sensor.temperature < self.target)
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else:
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self.set_heat(False)
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self.set_cool(self.temp_sensor.temperature > self.target)
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self.set_air(self.temp_sensor.temperature<180)
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if self.runtime >= self.totaltime:
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self.reset()
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time.sleep(0.5)
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def set_heat(self,value):
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if value:
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self.heat = 1.0
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if gpio_available:
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GPIO.output(config.gpio_heat, GPIO.LOW)
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else:
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self.heat = 0.0
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if gpio_available:
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GPIO.output(config.gpio_heat, GPIO.HIGH)
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def set_cool(self,value):
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if value:
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self.cool = 1.0
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if gpio_available:
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GPIO.output(config.gpio_cool, GPIO.LOW)
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else:
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self.cool = 0.0
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if gpio_available:
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GPIO.output(config.gpio_cool, GPIO.HIGH)
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def set_air(self,value):
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if value:
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self.air = 1.0
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if gpio_available:
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GPIO.output(config.gpio_air, GPIO.LOW)
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else:
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self.air = 0.0
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if gpio_available:
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GPIO.output(config.gpio_air, GPIO.HIGH)
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def get_state(self):
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state = {
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'runtime': self.runtime,
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'temperature': self.temp_sensor.temperature,
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'target': self.target,
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'state': self.state,
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'heat': self.heat,
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'cool': self.cool,
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'air' : self.air,
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'totaltime': self.totaltime
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}
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return state
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class TempSensor(threading.Thread):
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def __init__(self,oven):
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threading.Thread.__init__(self)
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self.daemon = True
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self.temperature = 0
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self.oven = oven
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if sensor_available:
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self.thermocouple = MAX31855(gpio_sensor_cs,
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gpio_sensor_clock,
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gpio_sensor_data,
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"c"
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)
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def run(self):
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while True:
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if sensor_available:
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self.temperature = self.thermocouple.get()
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else:
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time_delta = (20.0 - self.temperature)/40
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power_delta = 8.0*self.oven.heat
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self.temperature += (time_delta+power_delta)
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time.sleep(0.5)
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class Profile():
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def __init__(self,json_data):
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obj = json.loads(json_data)
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self.name = obj["name"]
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self.data = sorted(obj["data"])
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def get_duration(self):
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return max([t for (t,x) in self.data])
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def get_surrounding_points(self,time):
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if time > self.get_duration():
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return (None,None)
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prev_point = None
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next_point = None
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for i in range(len(self.data)):
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if time < self.data[i][0]:
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prev_point = self.data[i-1]
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next_point = self.data[i]
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break
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return (prev_point,next_point)
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def is_rising(self,time):
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(prev_point,next_point) = self.get_surrounding_points(time)
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if prev_point and next_point:
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return prev_point[1] < next_point[1]
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else:
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return False
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def get_target_temperature(self,time):
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if time > self.get_duration():
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return 0
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(prev_point,next_point) = self.get_surrounding_points(time)
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incl = float(next_point[1] - prev_point[1]) / float(next_point[0] - prev_point[0])
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temp = prev_point[1] + (time - prev_point[0]) * incl
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return temp
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