Introduction to Data Acquistion Systems (DAQ)

From analog signals to actionable data - a closer look at DAQ systems.

DAQ, short for Data Acquisition, refers to the process of collecting, measuring, and analyzing physical signals from the real world and converting them into digital data that can be used by a computer or microcontroller. It’s a cornerstone technology in engineering, automation, scientific research, and embedded systems.

Image generated with OpenAI’s DALL·E.

What Does a DAQ System Do?

At its core, a DAQ system bridges the gap between the physical world and digital systems. It typically performs the following steps:

1. Sensing

   • Captures signals like temperature, pressure, force, or voltage using sensors (e.g., load cells, thermocouples, strain gauges).

2. Signal Conditioning

   • Amplifies, filters, or converts signals to a suitable form.

3. Analog-to-Digital Conversion (ADC)

   • Converts analog signals into digital data.

4. Processing & Storage

   • The data is processed, displayed, logged, or sent to another system for analysis.

Key Components of a DAQ System

• Sensors

  • Detect physical changes (e.g., strain, temperature, motion).

• Signal Conditioning Circuits

  • Amplifiers, filters, isolation circuits.

• Analog-to-Digital Converter (ADC)

  • Converts signals to digital form.

• Microcontroller / Processor

  • Handles data collection and communication.

• Software Interface

  • Used for configuration, visualization, and logging.

Where is DAQ Used?

• Industrial automation and test benches

• Automotive diagnostics and validation

• Scientific research and lab instrumentation

• Aerospace and defense testing

• Energy systems and environmental monitoring

Whether you're measuring the braking force of a truck or logging temperature changes in a climate chamber, DAQ is what makes accurate, repeatable measurement possible.

Why It Matters?

Modern systems are data-driven. A DAQ system enables engineers and researchers to:

• Monitor system performance in real-time

• Detect faults or trends

• Validate product functionality

• Automate testing and reporting

DAS-882: A Purpose-Built DAQ Example

The DAS-882 board featured in this blog is a real-world example of a compact, purpose-built DAQ platform. It collects both analog and digital inputs from sensors like load cells, proximity switches, and pressure transducers, and streams the data over RS-422.

With 8 analog channels and 8 digital inputs, it serves applications like roller brake testers, force measurement rigs, and embedded monitoring systems.

In the next post, I'll give a brief introduction to the Roller Brake Tester - a diagnostic instrument and measuring device, and explain the role of the DAS-882 in this context.

Stay tuned!