DAQ control using National Instruments DAQmx framework
Project description
Purpose
To create a python API for working with National Instruments NIDAQmx.
Installation
python -m pip install daqmx
Usage
You must first import the package:
from ni import NIDAQmxInstrument
You can then allocate the hardware without any further specifiers. Note that, if there is more than one DAQmx instrument available on your PC, the hardware allocated may not be the one you are expecting! Be sure to specify the device name, model number, or serial number to make the hardware acquisition process more deterministic.
daq = NIDAQmxInstrument() # hardware with no specifiers
daq = NIDAQmxInstrument(device_name='Dev3') # hardware specified by the device name
daq = NIDAQmxInstrument(model_number='USB-6001') # hardware specified by model number
daq = NIDAQmxInstrument(serial_number=1234) # hardware specified by serial number
Once you have the NIDAQmxInstrument
instance, then you can use it to operate
the instrument. See the examples directory for complete examples.
Some snippets to demonstrate common usages:
daq = NIDAQmxInstrument() # automatic acquisition of hardware
daq.ao0 = 2.7V # set the analog out 0 to 2.7V
daq.ao1 = 1.3V # set the analog out 1 to 1.3V
print(f'daq.ai0.value: {daq.ai0.value:.3f}V') # print a single sample
# from analog input 0
values = daq.ai1.capture(
sample_count=10, rate=100,
max_voltage=10.0, min_voltage=-10.0,
mode='differential', timeout=3.0
) # capture 10 samples from ai1 at a rate of 100Hz in differential mode
print(values)
daq.port0.line2 = True # set the daq.<port>.<line> to True or False to write
print(daq.port0.line3) # read the daq.<port>.<line> to read state of line
Project details
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