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interface.py
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interface.py
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import serial
import logging
from time import sleep
logging.basicConfig(level=logging.DEBUG)
def initPumps(port=0,N=1):
pumps = []
ser = serial.Serial(port, baudrate=9600, stopbits=2)
for i in range(N):
pumps.append(Model44(ser,i))
return pumps
class Model44(object):
prompts = {
b':': 'stopped',
b'>': 'running',
b'<': 'reverse',
b'/': 'paused',
b'*': 'stopped',
b'^': 'wait', # dispense trigger wait
}
ranges = [ 'uL/min', 'mL/min', 'uL/hr' , 'mL/hr' ]
def __init__(self, port=0, number=0):
self.pumpN = str(number)
try:
if not port.isOpen():
port.open()
self.port = port
except AttributeError:
self.port = serial.Serial(port, baudrate=9600, stopbits=2)
try:
ver = self.get_version()
except:
self.last_status = 'stopped'
finally:
logging.info('Connected to version {} Model44'.format(ver))
def _write(self, cmd):
logging.debug('write: {}'.format(cmd))
self.port.write((self.pumpN+' '+cmd+'\r').encode('utf-16le'))
def _read_reply(self):
s = self.port.read(1)
if s != b'\n':
raise RuntimeError('Expected LF, saw "{}"'.format(s))
reply = None
prompt = None
s = b''
for i in range(50):
s += self.port.read(1)
if s[-1] == ord('\r'):
reply = s.decode().strip()
if len(s) >= 2 and s[-2:-1].isdigit() and s[-1:-2:-1] in Model44.prompts:
prompt = Model44.prompts[s[-1:-2:-1]]
break
logging.debug("read: {}".format(s))
if prompt == None:
raise RuntimeError('Expected prompt, got "{}"'.format(s))
else:
self.last_status = prompt
return reply
def _read_value(self):
s = self._read_reply()
return float(s.strip())
def _format_float(self, n):
if n > 1e6: raise ArgumentError('Number too large')
return ('{:06f}'.format(n))[:6]
def __value_func(cmd):
def f(self):
self._write(cmd)
return self._read_value()
return f
def __command_func(cmd):
def f(self):
self._write(cmd)
self._read_reply()
return f
def get_version(self):
self._write('VER')
version = self._read_reply()
return version
def get_status(self):
""" Get status of pump """
return self.last_status
def get_flow_rate(self):
units = { 'ul/mn': 'uL/min',
'ml/mn': 'mL/min',
'ul/hr': 'uL/hr',
'ml/hr': 'mL/hr'}
self._write('RAT')
s = self._read_reply()
value, unit = s.split()
return float(value), units[unit]
def get_mode(self):
self._write('MOD')
mode = self._read_reply()
return mode.lower().strip()
get_diameter = __value_func('DIA')
get_target_volume = __value_func('TGT')
get_volume_accum = __value_func('DEL')
start = __command_func('RUN')
stop = __command_func('STP')
clear_volume_accum = __command_func('CLD')
clear_target = __command_func('TGT 0')
reverse = __command_func('DIR REV')
def set_diameter(self, value):
""" Set diameter of syringe in millimeters """
self._write('DIA ' + self._format_float(value))
return self._read_reply()
def set_direction(self, dir):
d = 'INF' if dir > 0 else 'REF'
self._write('DIR {}'.format(d))
self._read_reply()
def set_flow_rate(self, value, range):
""" Set flow rate in given range """
ranges = {
'uL/min': 'UM',
'mL/min': 'MM',
'uL/hr' : 'UH',
'mL/hr' : 'MH' }
if range not in ranges:
raise Exception("Invalid range")
self._write("RAT {} {}".format(self._format_float(value), ranges[range]))
self._read_reply()
def set_target_volume(self, value):
""" Set the target volume """
self._write("TGT " + self._format_float(value))
self._read_reply()
def set_pump_mode(self):
self._write('MOD PMP')
self._read_reply()
def set_volume_mode(self):
self._write('MOD VOL')
self._read_reply()
class OpenScale(object):
def __init__(self, port='COM7'):
try:
if not port.isOpen():
port.open()
self.port = port
except AttributeError:
self.port = serial.Serial(port, baudrate=115200)
self.port.timeout = 0
logging.debug('Conncting to OpenScale')
self._wait_for_prompt(b'Readings:\r\n')
self.tare()
def _write(self, cmd):
logging.debug('write: {}'.format(cmd))
self.port.write(cmd)
def _wait_for_prompt(self, prompt=b'>'):
line = self.port.readline()
while line != prompt:
line = self.port.readline()
def tare(self):
logging.debug('Tareing load cell')
# Enter menu
self._write(b'x')
self._wait_for_prompt(b'>')
# Run tare operation
self._write(b'1')
self._wait_for_prompt(b'>')
# Exit menu
self._write(b'x')
self._wait_for_prompt(b'Exiting\r\n')
sleep(0.5)
if abs(self.get_reading()[0]) < 0.01:
logging.debug('Tared successfully')
else:
logging.debug('Tare unsuccessful')
def get_reading(self):
last_line = self.port.readlines()[-1]
line = last_line.decode('utf-8').split(',')
self.last_timestamp = int(line[0])
self.last_force = float(line[1])
self.last_unit = line[2]
self.last_temp = float(line[3])
return self.last_force, self.last_unit, self.last_temp