def __init__(self, datasocket=None):
threading.Thread.__init__(self)
if datasocket is not None:
self.datasocket = datasocket
else:
self.datasocket = None
self.measured_voltage = 0
self.filament = {}
self.filament['device'] = CPX.CPX400DPDriver(1, usbchannel=0)
self.filament['voltage'] = 0
self.filament['current'] = 0
self.filament['idle_voltage'] = 3
self.filament['device'].set_current_limit(5)
self.filament['device'].output_status(True)
self.bias = {}
self.bias['device'] = CPX.CPX400DPDriver(2, usbchannel=0)
self.bias['grid_voltage'] = 0
self.bias['grid_current'] = 0
self.bias['device'].output_status(True)
self.looptime = 0
self.update_setpoint(0.2)
self.adc = DeltaSigma(0x68, 0x69, 18)
self.adc.setPGA(8) # Adjust this if resistor value is changed
self.running = True
self.wanted_voltage = 0
self.emission_current = 999
self.pid = pid.PID(2, 0.07, 0, 9)
self.pid.UpdateSetpoint(self.setpoint)
def __init__(self, datasocket=None):
threading.Thread.__init__(self)
if datasocket is not None:
self.datasocket = datasocket
else:
self.datasocket = None
self.measured_voltage = 0
self.filament = {}
port = '/dev/serial/by-id/usb-TTI_CPX400_Series_PSU_C2F952E5-if00'
self.filament['device'] = CPX.CPX400DPDriver(1, port)
self.filament['voltage'] = 0
self.filament['current'] = 0
self.filament['idle_voltage'] = 3
self.filament['device'].set_current_limit(5)
self.filament['device'].output_status(True)
self.bias = {}
self.bias['device'] = CPX.CPX400DPDriver(2, port)
self.bias['grid_voltage'] = 0
self.bias['grid_current'] = 0
self.bias['device'].output_status(True)
self.looptime = 0
self.update_setpoint(0.7)
self.adc = DeltaSigma(0x68, 0x69, 18)
self.adc.setPGA(8) # Adjust this if resistor value is changed
self.running = True
self.wanted_voltage = 0
self.emission_current = 999
self.pid = pid.PID(2, 0.03, 0, 9)
self.pid.UpdateSetpoint(self.setpoint)
class EmissionControl(threading.Thread):
""" Control the emission of a filament. """
def __init__(self, datasocket=None):
threading.Thread.__init__(self)
if datasocket is not None:
self.datasocket = datasocket
else:
self.datasocket = None
self.measured_voltage = 0
self.filament = {}
port = '/dev/serial/by-id/usb-TTI_CPX400_Series_PSU_C2F952E5-if00'
self.filament['device'] = CPX.CPX400DPDriver(1, port)
self.filament['voltage'] = 0
self.filament['current'] = 0
self.filament['idle_voltage'] = 3
self.filament['device'].set_current_limit(5)
self.filament['device'].output_status(True)
self.bias = {}
self.bias['device'] = CPX.CPX400DPDriver(2, port)
self.bias['grid_voltage'] = 0
self.bias['grid_current'] = 0
self.bias['device'].output_status(True)
self.looptime = 0
self.update_setpoint(0.7)
self.adc = DeltaSigma(0x68, 0x69, 18)
self.adc.setPGA(8) # Adjust this if resistor value is changed
self.running = True
self.wanted_voltage = 0
self.emission_current = 999
self.pid = pid.PID(2, 0.03, 0, 9)
self.pid.UpdateSetpoint(self.setpoint)
def set_bias(self, bias):
""" Set the bias-voltage """
if self.datasocket is not None:
self.datasocket.set_point_now('ionenergy', bias)
if bias > -1:
self.bias['device'].set_voltage(bias)
if bias < 5:
pass # TODO: Implement check to make sure not to melt the filament
def update_setpoint(self, setpoint):
""" Update the setpoint """
self.setpoint = setpoint
if self.datasocket is not None:
self.datasocket.set_point_now('setpoint', setpoint)
def set_filament_voltage(self, U):
""" Set the filament voltage """
return(self.filament['device'].set_voltage(U))
def read_filament_voltage(self):
""" Read the filament voltage """
return(self.filament['device'].read_actual_voltage())
def read_filament_current(self):
""" Read the filament current """
return(self.filament['device'].read_actual_current())
def read_grid_voltage(self):
"""Read the actual grid voltage """
return(self.bias['device'].read_actual_voltage())
def read_grid_current(self):
""" Read the grid current as measured by power supply """
return(self.bias['device'].read_actual_current())
def read_emission_current(self):
""" Read the actual emission current """
value = self.adc.readVoltage(1)
self.measured_voltage = value
current = 1000.0 * value / 3.4 # Resistance value read off component label
return(current)
def run(self):
while self.running:
#time.sleep(0.1)
t = time.time()
self.emission_current = self.read_emission_current()
self.wanted_voltage = self.pid.WantedPower(self.emission_current) + self.filament['idle_voltage']
self.pid.UpdateSetpoint(self.setpoint)
self.set_filament_voltage(self.wanted_voltage)
self.filament['voltage'] = self.read_filament_voltage()
self.filament['current'] = self.read_filament_current()
self.bias['grid_voltage'] = self.read_grid_voltage()
self.bias['grid_current'] = self.read_grid_current()
if self.datasocket is not None:
self.datasocket.set_point_now('emission', self.emission_current)
self.looptime = time.time() - t
self.setpoint = 0
self.set_filament_voltage(0)
self.set_bias(0)
from ABElectronics_DeltaSigmaPi import DeltaSigma
import time
import os
# ================================================
# ABElectronics Delta-Sigma Pi 8-Channel ADC demo
# Version 1.0 Created 09/05/2014
#
# Requires python smbus to be installed
# run with: python demo-readvoltage.py
# ================================================
# Initialise the ADC device using the default addresses and sample rate, change this value if you have changed the address selection jumpers
# Sample rate can be 12,14, 16 or 18
adc = DeltaSigma(0x68, 0x69, 18)
while (True):
# clear the console
os.system('clear')
# read from adc channels and print to screen
print ("Channel 1: %02f" % adc.readVoltage(1))
print ("Channel 2: %02f" % adc.readVoltage(2))
print ("Channel 3: %02f" % adc.readVoltage(3))
print ("Channel 4: %02f" % adc.readVoltage(4))
print ("Channel 5: %02f" % adc.readVoltage(5))
print ("Channel 6: %02f" % adc.readVoltage(6))
print ("Channel 7: %02f" % adc.readVoltage(7))
print ("Channel 8: %02f" % adc.readVoltage(8))
class EmissionControl(threading.Thread):
""" Control the emission of a filament. """
def __init__(self, datasocket=None):
threading.Thread.__init__(self)
if datasocket is not None:
self.datasocket = datasocket
else:
self.datasocket = None
self.measured_voltage = 0
self.filament = {}
self.filament['device'] = CPX.CPX400DPDriver(1, usbchannel=0)
self.filament['voltage'] = 0
self.filament['current'] = 0
self.filament['idle_voltage'] = 3
self.filament['device'].set_current_limit(5)
self.filament['device'].output_status(True)
self.bias = {}
self.bias['device'] = CPX.CPX400DPDriver(2, usbchannel=0)
self.bias['grid_voltage'] = 0
self.bias['grid_current'] = 0
self.bias['device'].output_status(True)
self.looptime = 0
self.update_setpoint(0.2)
self.adc = DeltaSigma(0x68, 0x69, 18)
self.adc.setPGA(8) # Adjust this if resistor value is changed
self.running = True
self.wanted_voltage = 0
self.emission_current = 999
self.pid = pid.PID(2, 0.07, 0, 9)
self.pid.UpdateSetpoint(self.setpoint)
def set_bias(self, bias):
""" Set the bias-voltage """
if bias > -1:
self.bias['device'].set_voltage(bias)
if bias < 5:
pass # TODO: Implement check to make sure not to melt the filament
def update_setpoint(self, setpoint):
""" Update the setpoint """
self.setpoint = setpoint
if self.datasocket is not None:
self.datasocket.set_point_now('setpoint', setpoint)
def set_filament_voltage(self, U):
""" Set the filament voltage """
return(self.filament['device'].set_voltage(U))
def read_filament_voltage(self):
""" Read the filament voltage """
return(self.filament['device'].read_actual_voltage())
def read_filament_current(self):
""" Read the filament current """
return(self.filament['device'].read_actual_current())
def read_grid_voltage(self):
"""Read the actual grid voltage """
return(self.bias['device'].read_actual_voltage())
def read_grid_current(self):
""" Read the grid current as measured by power supply """
return(self.bias['device'].read_actual_current())
def read_emission_current(self):
""" Read the actual emission current """
value = self.adc.readVoltage(1)
self.measured_voltage = value
current = 1000.0 * value / 3.4 # Resistance value read off component label
return(current)
def run(self):
while self.running:
#time.sleep(0.1)
t = time.time()
self.emission_current = self.read_emission_current()
self.wanted_voltage = self.pid.WantedPower(self.emission_current) + self.filament['idle_voltage']
self.pid.UpdateSetpoint(self.setpoint)
self.set_filament_voltage(self.wanted_voltage)
self.filament['voltage'] = self.read_filament_voltage()
self.filament['current'] = self.read_filament_current()
self.bias['grid_voltage'] = self.read_grid_voltage()
self.bias['grid_current'] = self.read_grid_current()
if self.datasocket is not None:
self.datasocket.set_point_now('emission', self.emission_current)
self.looptime = time.time() - t
self.setpoint = 0
self.set_filament_voltage(0)
self.set_bias(0)
