Analog Data Acquisition

Configure analog input channels and acquire data from your device

Before you use analog input channels, see Hardware Discovery and Setup.

Functions

`addinput`	Add input channel to device interface (Since R2020a)
`read`	Read data acquired by hardware (Since R2020a)
`readwrite`	Simultaneously read and write device channel data (Since R2020a)
`start`	Start DataAcquisition background operation (Since R2020a)
`stop`	Stop background operation (Since R2020a)
`removechannel`	Remove channel from device interface (Since R2020a)
`flush`	Flush DataAcquisition input and output buffers (Since R2020a)

Apps

Analog Input Recorder

Acquire and visualize analog input signals

Topics

Basic Workflows

Acquire Data in the Foreground
Acquire data from a device while MATLAB^® waits.
Acquire Data in the Background with Live Plot Updates
Acquire data from a device while MATLAB continues to run.
Generate and Measure Signals with Analog Devices ADALM1000
Program a DataAcquisition for ADALM1000 input and output.

Tools Workflows

Acquire Data with Analog Input Recorder
Use the Analog Input Recorder app to visualize and record analog input signals.

Multiple Channels and Measurement Types

Acquire Data from Multiple Channels
This example shows how to acquire data from multiple channels, and from multiple devices on the same chassis.
Acquire Bridge Measurements
This example shows how to acquire and plot data from an NI USB-9219 device.
Acquire Sound Pressure Data
This example shows how to acquire sound data from an NI 9234.
Acquire IEPE Data
This example shows how to acquire IEPE data using an NI 9234.
Acquire Data and Generate Signals Simultaneously
Acquire and generate data at the same time.

Related Information

Featured Examples

Getting Started with NI Devices

Get started with National Instruments devices from the command line.

Open Script

Getting Started with MCC Devices

Get started with MCC devices from the command line.

Open Script

Getting Started Acquiring Data with Digilent Analog Discovery

Acquire voltage data at a rate of 300 kHz. The input waveform is a sine wave (10 Hz, 2 Vpp) provided by an external function generator.

Open Script

Acquire Data Using NI Devices

Acquire data from a National Instruments™ device.

Open Script

Acquire Data Using NI FieldDAQ Device

Acquire data from an NI FieldDAQ device.

Open Live Script

Acquire Continuous and Background Data Using NI Devices

Acquire analog input data using non-blocking commands. This allows you to continue working in the MATLAB command window during the acquisition. This is called background acquisition. Use foreground acquisition to cause MATLAB to wait for the entire acquisition to complete before you can execute your next command.

Open Script

Acquire Data from Multiple Channels using an MCC Device

Acquire data from multiple analog input channels with an MCC device.

Open Script

Acquire Data from an Accelerometer

Acquire and display data from an accelerometer attached to a vehicle driven under uneven road conditions.

Open Script

Measure Strain Using an Analog Bridge Sensor

Acquire bridge circuit voltage ratio data using a CompactDAQ module, then compute and plot strain values. This example does not apply to USB devices such as the NI USB-9219.

Open Script

Acquire Temperature Data From a Thermocouple

Read data from NI devices that support thermocouple measurements.

Open Script

Acquire Temperature Data From an RTD

Acquire temperature data from a Resistive temperature device (RTD) and display the readings. The device is attached inside a PC case to monitor the internal temperature changes.

Open Script

Acquire and Analyze Sound Pressure Data From an IEPE Microphone

Acquire and display sound pressure data from a PCB® IEPE array microphone, Model 130E20. The sensor is recording sound pressure generated by a tuning fork at Middle C (261.626 Hz) frequency.

Open Script

Acquire and Analyze Noisy Clock Signals

Acquire clock signals and analyze transitions, pulses, and compute metrics including rise time, fall time, slew rate, overshoot, undershoot, pulse width, and duty cycle. This example uses Data Acquisition Toolbox in conjunction with the Signal Processing Toolbox.

Log Analog Input Data to a File Using NI Devices

Save data acquired in the background to a file.

Open Script

Capture Data with Software-Analog Triggering

Implement a triggered data capture based on a trigger condition defined in software. Data Acquisition Toolbox provides functionality for hardware triggering a data acquisition object, for example starting acquisition from a DAQ device based on an external digital trigger signal (rising or falling edge). For some applications however, it is desirable to start capturing or logging data based on the analog signal being measured, allowing for capturing only the signal of interest out of a continuous stream of digitized measurement data (such as an audio recording when the signal level passes a certain threshold).

Open Script