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legacy.py
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legacy.py
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IS_MEASURE = 'is_measure'
TIME_start = 'time_start'
TIME_stop = 'time_stop'
WAS_MEASURE = 'was_measure'
WEIGHT_start = 'weight_start'
WEIGHT_stop = 'weight_stop'
#----------------------GPIO Setup and Assignment-------------------------------
#GPIO.setmode(GPIO.BCM)
#GPIO Assignment
PIN_PUMP_1 = 17
PIN_PUMP_2 = 27
PIN_Switch_Valve = 22
PIN_Drain_Valve = 18
PIN_Level_Scale_Up = 24
PIN_Level_Scale_Low = 25
PIN_Level_Const_Low = 5
#GPIO setup
# GPIO.setup(PIN_PUMP_1, GPIO.OUT)
# GPIO.setup(PIN_PUMP_2, GPIO.OUT)
# GPIO.setup(PIN_Switch_Valve, GPIO.OUT) # Switch between Valves. Bypass Valve initially open!
# GPIO.setup(PIN_Drain_Valve, GPIO.OUT)
# GPIO.setup(PIN_Level_Scale_Up, GPIO.IN)
# GPIO.setup(PIN_Level_Scale_Low, GPIO.IN)
# GPIO.setup(PIN_Level_Const_Low, GPIO.IN)
#--------------------------------Open Serial Port----------------------------------------
# ser = serial.Serial()
# ser.port = '/dev/ttyS0'
# ser.baudrate = 9600
# ser.bytesize = serial.SEVENBITS
# ser.timeout = 1
#----------------------------Exceptions--------------------------------------------------
class Tank_Level_Error(Exception):
pass
#----------------------------Functions and Procedures------------------------------------
def start_station():
print('Starte Betrieb')
predefine_gpios()
start_pump1()
time.sleep(t_fill_const)
def predefine_gpios():
GPIO.output(PIN_PUMP_1, GPIO.LOW)
GPIO.output(PIN_PUMP_2, GPIO.LOW)
GPIO.output(PIN_Switch_Valve, GPIO.LOW) # Bypass Valve Open!
GPIO.output(PIN_Drain_Valve, GPIO.LOW) #Drain closed
def new_measurement():
reset_values()
start_pump2()
# hier Drossel einstellen
time.sleep(t_stabilize) # zur Stabilisierung der Stoemung nach dem Drosseln
#get_weight()
start_filling()
#burst() # Vorgang zur Bestimmung von Messfehlern der Umschalteinrichtung (provisorisch)
wait_for_full_tank()
stop_filling()
#get_weight()
display_results()
time.sleep(t_after)
drain_weighting_tank()
def reset_values():
# Messwerte zuruecksetzen
state = {
IS_MEASURE: False,
TIME_start: None,
TIME_stop: None,
WAS_MEASURE: False,
WEIGHT_start: None,
WEIGHT_stop: None
}
def start_pump1():
GPIO.output(PIN_PUMP_1, GPIO.HIGH)
print('Pumpe 1 startet')
def start_pump2():
if GPIO.input(PIN_Level_Const_Low) == GPIO.HIGH:
GPIO.output(PIN_PUMP_2, GPIO.HIGH)
print('Pumpe 2 startet')
else:
const_tank_low()
def start_filling():
if not state[IS_MEASURE] and GPIO.input(PIN_Level_Scale_Up) != GPIO.HIGH:
GPIO.output(PIN_Switch_Valve, GPIO.HIGH)
time.sleep(0.075) # Kompensation Umschaltzeit
state[TIME_start] = time.time()
state[IS_MEASURE] = True
state[WAS_MEASURE] = False
print('Umgeschaltet - Waagenfass wird beladen')
else:
raise Exception
def wait_for_full_tank():
GPIO.wait_for_edge(PIN_Level_Scale_Up, GPIO.RISING)
print('Waagenfass voll gefuellt')
def stop_filling():
if state[IS_MEASURE]:
GPIO.output(PIN_Switch_Valve, GPIO.LOW)
time.sleep(0.075) # Kompensation Umschaltzeit
state[TIME_stop] = time.time()
state[IS_MEASURE] = False
state[WAS_MEASURE] = True
print('Umgeschaltet - Vorratsfass wird beladen')
else:
raise Exception
def display_results():
delta_t = state[TIME_stop] - state[TIME_start]
delta_m = state[WEIGHT_stop] - state[WEIGHT_start]
m_dot = 1.00106*delta_m / delta_t #Dichtekorrektur
V_dot = m_dot / rho
V_dot_lph = V_dot * 3600000
print('Gemessene Werte')
print('Datum'+time.strftime("%d.%m.%Y %H:%M:%S"))
print('Messzeit: '+ str(delta_t)+ ' s')
print ('Gewichtsdifferenz: '+ str(delta_m)+ ' Kg')
print ('Massenstrom: ' + str(m_dot)+ 'Kg/s')
print('grober Volumenstrom ' + str(V_dot) + 'Kg/m^3 oder ' + str(V_dot_lph) + ' l/h' )
# Ergebnisse in text abspeichern, provisorisch
note = open("Messwerte.txt", "a")
note.write(time.strftime("%d.%m.%Y %H:%M:%S")+'\n')
note.write('Messzeit: ' + str(delta_t) + ' s\n')
note.write('Gewichtsdifferenz: ' + str(delta_m) + ' Kg\n')
note.write('Massenstrom: ' + str(m_dot) + 'Kg/s\n')
note.write('grober Volumenstrom ' + str(V_dot) + 'Kg/m^3 oder ' + str(V_dot_lph) + ' l/h\n')
note.write(' \n')
note.close()
def drain_weighting_tank():
GPIO.output(PIN_Drain_Valve, GPIO.HIGH)
GPIO.output(PIN_PUMP_2, GPIO.LOW)
print('Waagenfass wird entleert')
print('Pumpe 2 gestoppt')
if GPIO.input(PIN_Level_Scale_Low) == GPIO.HIGH:
GPIO.wait_for_edge(PIN_Level_Scale_Low, GPIO.FALLING)
time.sleep(20)
GPIO.output(PIN_Drain_Valve, GPIO.LOW)
print('Entleerung Abgeschlossen')
def const_tank_low():
raise Tank_Level_Error('Fuellstand Konstant-Fass zu niedrig')
# def get_weight():
# time.sleep(10)
# print('Waegevorgang - bitte stillhalten')
# ser.open()
# while True:
# line = ser.readline() # Zeile einlesen
# #print(line)
# sline = line.split() # Zeile fuer Weiterverarbeitung auftrennen
# if len(sline) == 3: # Wenn stabil (Waage sendet Kg, Zeichen wenn stabil), dann Speicherung
# print('Wert stabil')
# result = ''.join(sline[:2])
# break
# print('Waegevorgang beendet')
# print('Das gemessene Gewicht betraegt: '+ str(line))
# if state[WAS_MEASURE] == False:
# state[WEIGHT_start] = float(result)
# else:
# state[WEIGHT_stop] = float(result)
# ser.close()
def turn_off():
GPIO.output(PIN_Switch_Valve, GPIO.LOW)
GPIO.output(PIN_PUMP_2, GPIO.LOW)
GPIO.output(PIN_PUMP_1, GPIO.LOW)
print('Pumpen ausgeschaltet')
if GPIO.input(PIN_Level_Scale_Low) == GPIO.HIGH:
drain_weighting_tank()
print('Betrieb beendet')
GPIO.cleanup()
def burst():
i=0
while True:
i +=1
time.sleep(1)
stop_filling()
#get_weight()
print('Messzeit: '+str(state[TIME_stop]-state[TIME_start])+ ' '+str(i))
time.sleep(4)
start_filling()
if i == 25:
break
#---------------------------Default Values---------------------------------
t_fill_const = 70
t_stabilize = 25
t_after =20
t_timeout = 1000 # Einbinden!
#Angenommene Werte - Bei Einbindung weiterer Sensoren veraendern/ rausnehmen
rho = 997.05 # Dichte bei 25GradCelsius
# Tupel zur Messwerterfassung
state = {
IS_MEASURE: False, # findet Messung statt?
TIME_start: None, # Startzeit der Messung
TIME_stop: None, # Endzeit der Messung
WAS_MEASURE: False, # fand Messung schon statt?
WEIGHT_start: None, # Startgewicht
WEIGHT_stop: None # Endgewicht
}
# -------------------------General procedure-------------------------------
# def main():
# try:
# start_station()
#
# new_measurement()
#
# #Ende oder neue Messung
#
# except Tank_Level_Error as ex:
# print(ex)
# except KeyboardInterrupt:
# print('Stopped by user.')
# except Exception:
# print('Unknown error.')
# raise
#
# turn_off()