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temperature_controller.py
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temperature_controller.py
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import serial
import serial.tools.list_ports
import time
import sys
from threading import Thread
from collections import Iterable, deque
import numpy as np
import sounddevice as sd
is_realtime_measurement_running = False
def sine_tone(frequency, duration, volume=1, sample_rate=44100):
n_samples = int(sample_rate * duration)
t = np.arange(n_samples) / sample_rate
try:
sd.play(volume * np.sin(2 * np.pi * frequency * t),
samplerate=sample_rate,
blocking=True,
device='sysdefault')
except ValueError:
pass
def snd_notify():
for i in range(30):
sine_tone(3135.96, 0.2)
#sine_tone(2093.00, 0.2)
sd.sleep(200)
def snd_warning():
for i in range(4):
sine_tone(2093.00, 0.2)
sine_tone(1760.00, 0.2)
def mean(arr):
return sum(arr) / len(arr)
class worker(Thread):
def __init__(self):
Thread.__init__(self)
self.daemon = True
self.ser = serial.Serial()
self.temperatures = [None, None]
self.output = [None, None]
self.pid_data = {1: {}, 2: {}}
self.error_in = ["", ""]
self.error_in_sounded = [False, False]
self.error_out = ["", ""]
self.error_out_sounded = [False, False]
self.communicating = False
self.last_temperatures = [deque(maxlen=120)] * 2
# self.open_serial()
def open_serial(self):
self.communicating = False
ports = serial.tools.list_ports.comports()
for port in ports:
if port.description == "ttyAMA0":
continue
if port.vid == 0x1fb9:
self.ser.port = port.device
self.ser.baudrate = 57600
self.ser.parity = serial.PARITY_ODD
self.ser.bytesize = serial.SEVENBITS
self.ser.timeout = 1
self.ser.write_timeout = 1
if not self.ser.is_open:
try:
self.ser.open()
except (serial.SerialException, TypeError):
pass
else:
time.sleep(1)
if self.ser.is_open:
print(port.device, 'opened for the temperature controller')
self.ser.write(b'*idn?')
self.ser.flush()
break
if not self.ser.is_open:
time.sleep(1)
def read_temperatures(self):
for index, letter in zip([0, 1], ['A', 'B']):
cmd = "rdgst?"
try:
resp = self.read(cmd, [letter]).split(';')[-1].strip()
except:
resp = None
if resp == "000":
cmd = "krdg?"
try:
resp = self.read(cmd, [letter]).split(';')[-1].strip()
except (serial.SerialException, TypeError):
resp = None
if resp != None:
try:
temp = float(resp)
except (TypeError, ValueError):
self.temperatures[index] = None
else:
if len(self.last_temperatures[index]) != 0:
prev_mean_temp = mean(self.last_temperatures[index])
else:
prev_mean_temp = None
self.last_temperatures[index].append(temp)
if prev_mean_temp is not None and prev_mean_temp > 77:
mean_temp = mean(self.last_temperatures[index])
if mean_temp < 77:
snd_notify()
self.temperatures[index] = temp
self.error_in[index] = ""
self.error_in_sounded[index] = False
else:
self.temperatures[index] = None
else:
self.temperatures[index] = None
if resp != None and len(resp) == 3:
try:
r = int(resp)
except:
pass
else:
self.error_in[index] = ""
if r >= 128:
self.error_in[index] = "Sensor units overrange for " + letter
r -= 128
if r >= 64:
if len(self.error_in) > 0:
self.error_in[index] += '\n'
self.error_in[index] += "Sensor units zero for " + letter
r -= 64
if r >= 32:
if len(self.error_in) > 0:
self.error_in[index] += '\n'
self.error_in[index] += "Temp overrange for " + letter
r -= 32
if r >= 16:
if len(self.error_in) > 0:
self.error_in[index] += '\n'
self.error_in[index] += "Temp underrange for " + letter
r -= 16
if r >= 1:
if len(self.error_in) > 0:
self.error_in[index] += '\n'
self.error_in[index] += "Invalid reading for " + letter
r -= 1
if r != 0:
self.error_in[index] = "Unknown temperature reading error for " + letter
# app.logger.warning(self.error_in[index])
if not self.error_in_sounded[index]:
snd_warning()
self.error_in_sounded[index] = True
return
def read_output(self):
for index, letter in zip([0, 1], ['1', '2']):
cmd = "htrst?"
try:
resp = self.read(cmd, [letter]).split(';')[-1].strip()
except:
resp = None
if resp == "0":
cmd = "htr?"
try:
resp = self.read(cmd, [letter]).split(';')[-1].strip()
except:
resp = None
if resp != None:
try:
self.output[index] = float(resp)
except (TypeError, ValueError):
self.output[index] = None
else:
self.error_out[index] = ""
self.error_out_sounded[index] = False
else:
self.output[index] = None
else:
self.output[index] = None
if resp != None and len(resp) > 0:
try:
r = int(resp)
except (TypeError, ValueError):
pass
else:
if r == 1:
self.error_out[index] = "Heater open load for " + letter
elif r == 2:
self.error_out[index] = "Heater short for " + letter
else:
self.error_out[index] = "Unknown output state reading error for " + letter
# app.logger.warning(self.error_out[index])
if not self.error_out_sounded[index]:
snd_warning()
self.error_out_sounded[index] = True
return
def pid_turn(self, data):
try:
output = data['output']
ok = True
if data['action'] == 1:
ok = ok and (data['mode'] in range(6))
ok = ok and (data['powerup_enable'] in [0, 1])
ok = ok and (data['range'] in range(4))
if data['mode'] != 3:
ok = ok and (output in [1, 2])
ok = ok and (data['input'] in range(3))
ok = ok and self.do("outmode", [output, data['mode'], data['input'], data['powerup_enable']])
ok = ok and self.do("pid", [output, data['P'], data['I'], data['D']])
ok = ok and self.do("setp", [output, data['value']])
else:
ok = ok and self.do("outmode", [output, data['mode'], 0, data['powerup_enable']])
ok = ok and self.do("mout", [output, data['manual']])
ok = ok and self.do("range", [output, data['range']])
elif data['action'] == 0:
ok = ok and (output in [1, 2])
ok = ok and self.do("outmode", [output, 0, 0, 0])
ok = ok and self.do("range", [output, 0])
else:
ok = False
except:
ok = False
else:
if data['action'] == 0:
self.pid_data[output] = {
'input': self.pid_data[output]['input'] if 'input' in self.pid_data[output] else None,
'mode': None,
'powerup_enable': self.pid_data[output]['powerup_enable'] if 'powerup_enable' in self.pid_data[output] else None,
'range': self.pid_data[output]['range'] if 'range' in self.pid_data[output] else None,
'value': self.pid_data[output]['value'] if 'value' in self.pid_data[output] else None,
'P': self.pid_data[output]['P'] if 'P' in self.pid_data[output] else None,
'I': self.pid_data[output]['I'] if 'I' in self.pid_data[output] else None,
'D': self.pid_data[output]['D'] if 'D' in self.pid_data[output] else None,
'manual': self.pid_data[output]['manual'] if 'manual' in self.pid_data[output] else None
}
elif data['action'] == 1:
if data['mode'] != 3:
self.pid_data[output] = {
'input': data['input'],
'mode': data['mode'],
'powerup_enable': data['powerup_enable'],
'range': data['range'],
'value': data['value'],
'P': data['P'],
'I': data['I'],
'D': data['D'],
'manual': self.pid_data[output]['manual'] if 'manual' in self.pid_data[output] else None
}
else:
self.pid_data[data['output']] = {
'input': self.pid_data[output]['input'] if 'input' in self.pid_data[output] else None,
'mode': data['mode'],
'powerup_enable': data['powerup_enable'],
'range': data['range'],
'value': self.pid_data[output]['value'] if 'value' in self.pid_data[output] else None,
'P': self.pid_data[output]['P'] if 'P' in self.pid_data[output] else None,
'I': self.pid_data[output]['I'] if 'I' in self.pid_data[output] else None,
'D': self.pid_data[output]['D'] if 'D' in self.pid_data[output] else None,
'manual': data['manual']
}
return ok
def read(self, cmd, payload):
resp = None
if self.ser.is_open:
msg = cmd + '?'
if isinstance(payload, Iterable):
first_item = True
for item in payload:
if first_item:
msg += ' '
first_item = False
else:
msg += ','
msg += str(item)
elif len(payload) > 0:
msg += ' ' + str(payload)
msg += '\n'
try:
self.ser.write(msg.encode('ascii'))
self.ser.flush()
resp = self.ser.readline().decode()[:-1]
except (serial.SerialException, TypeError, UnicodeError):
self.ser.close()
print("restarting " + self.ser.port)
self.open_serial()
else:
if len(resp) == 0:
self.ser.close()
print("restarting " + self.ser.port)
self.open_serial()
else:
self.open_serial()
return resp
def do(self, cmd, payload):
i = 0
while self.communicating:
time.sleep(0.1)
i += 1
if i > 30: # wait for 3 seconds at most
print("temperature controller is very busy")
return False
if self.ser.is_open:
msg = cmd.strip()
if isinstance(payload, Iterable):
first_item = True
for item in payload:
if first_item:
msg += ' '
first_item = False
else:
msg += ','
msg += str(item)
elif len(payload) > 0:
msg += ' ' + str(payload)
# print(msg)
msg += '\n'
try:
self.communicating = True
self.ser.write(msg.encode('ascii'))
self.ser.flush()
except (serial.SerialException, TypeError):
self.ser.close()
self.open_serial()
self.communicating = False
return False
else:
self.open_serial()
self.communicating = False
return False
self.communicating = False
return True
def run(self):
global is_realtime_measurement_running
while True:
try:
if not is_realtime_measurement_running:
self.communicating = True
self.read_temperatures()
self.read_output()
self.communicating = False
else:
self.temperatures = [None, None]
self.output = [None, None]
time.sleep(0.05)
except (KeyboardInterrupt, SystemExit):
print('caught ctrl+c')
try:
self.ser.close()
except (serial.SerialException, TypeError):
pass
self.communicating = False
self.join()
sys.exit(0)
class worker_rtm(Thread):
def __init__(self, temperature_controller):
Thread.__init__(self)
self.daemon = True
self.count = 0
self.label = 'A'
self.res = []
self.paused = True
self.tmpr = temperature_controller
def measure(self):
self.res = []
global is_realtime_measurement_running
if is_realtime_measurement_running:
print("another realtime measurement is running")
return False
if not (self.label in ['A', 'B']):
print("invalid thermometer mark:", self.label)
return False
i = 0
while self.tmpr.communicating:
time.sleep(0.1)
i += 1
if i > 30: # wait for 3 seconds at most
print("temperature controller is very busy")
return False
is_realtime_measurement_running = True
print("measurement started")
init_time = time.time()
while len(self.res) < self.count:
try:
cmd = "rdgst?"
try:
resp = self.tmpr.read(cmd, [self.label]).split(';')[-1].strip()
except:
resp = None
if resp == "000":
cmd = "krdg?"
try:
resp = self.tmpr.read(cmd, [self.label]).split(';')[-1].strip()
except:
resp = None
if resp != None:
try:
self.res.append({'time': time.time() - init_time, ('temperature' + self.label): float(resp)})
except:
pass
except (KeyboardInterrupt, SystemExit):
sys.exit(0)
is_realtime_measurement_running = False
print("measurement finished")
return True
def fire(self):
self.paused = False
def run(self):
try:
while True:
if not self.paused:
self.measure()
self.paused = True
else:
time.sleep(0.1)
except (KeyboardInterrupt, SystemExit):
print('caught ctrl+c')
self.ser.close()
self.join()
sys.exit()