oven controls heat/cool/air
This commit is contained in:
Sebastian Steuer
parent
1975664b0d
commit
7356fa3b36
96
oven.py
96
oven.py
@ -4,21 +4,24 @@ log = logging.getLogger(__name__)
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try:
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from max31855 import MAX31855, MAX31855Error
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sensor_dummy = False
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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_dummy = True
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sensor_available = False
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GPIO_HEAT = 11
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GPIO_COOL = 10
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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.setup(GPIO_HEAT, GPIO.OUT)
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no_gpio = False
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GPIO.setup(GPIO_HEAT, 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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no_gpio = True
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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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@ -38,10 +41,10 @@ class Oven (threading.Thread):
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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.power = 0.0
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self.state = Oven.STATE_IDLE
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if not no_gpio:
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GPIO.output(GPIO_HEAT, GPIO.HIGH)
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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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@ -58,28 +61,61 @@ class Oven (threading.Thread):
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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) , power %.2f (%.1fs/%.0f)"%(self.temp_sensor.temperature,self.target,self.power,self.runtime,self.totaltime))
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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.temp_sensor.temperature < self.target:
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self.power = 1.0
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if not no_gpio:
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GPIO.output(GPIO_HEAT, GPIO.LOW)
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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.power = 0.0
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if not no_gpio:
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GPIO.output(GPIO_HEAT, GPIO.HIGH)
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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(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(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(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(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(GPIO_COOL, 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(GPIO_COOL, 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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'power': self.power,
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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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@ -92,7 +128,7 @@ class TempSensor(threading.Thread):
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self.temperature = 0
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self.oven = oven
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if not sensor_dummy:
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if sensor_available:
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cs_pin = 27
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clock_pin = 22
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data_pin = 17
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@ -101,11 +137,11 @@ class TempSensor(threading.Thread):
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def run(self):
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while True:
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if not sensor_dummy:
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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.power
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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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@ -118,11 +154,11 @@ class Profile():
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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_target_temperature(self,time):
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def get_surrounding_points(self,time):
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if time > self.get_duration():
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return 0
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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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@ -131,7 +167,19 @@ class Profile():
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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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return prev_point[1] < next_point[1]
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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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@ -1 +0,0 @@
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{"type": "profile", "data": [[0, 20], [88.73784772617847, 221.87500000000003], [217.18696241866536, 69.06250000000001], [300, 0]], "name": "leadfree"}
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