Industrial automation is evolving rapidly, and engineers are increasingly using affordable computing platforms to learn automation concepts. One such platform is the Raspberry Pi. While it is not a replacement for an industrial PLC, it can be configured as a mini PLC for learning, prototyping, and small automation projects.
In this blog, you’ll learn how a Raspberry Pi can function as a mini PLC, the components required, and why it is an excellent learning tool for students interested in industrial automation and IoT.
What is a Raspberry Pi?
A Raspberry Pi is a compact, single-board computer developed for education and embedded system projects. Despite its small size, it can run a Linux operating system, execute programs, communicate with sensors, and control external devices.
Because of its flexibility and low cost, it has become popular among engineering students, hobbyists, and automation professionals.
At CADCAMGURU, Raspberry Pi is introduced as part of the Industrial Automation and IoT curriculum, helping students understand modern smart factory technologies alongside PLC programming.
What is a PLC?
A Programmable Logic Controller (PLC) is an industrial computer designed to control machines and manufacturing processes. PLCs are built to operate reliably in harsh industrial environments and support industrial input/output modules, communication protocols, and real-time control.
Unlike a Raspberry Pi, industrial PLCs are specifically designed for factory automation, offering higher electrical protection, reliability, and long-term operation.
Can a Raspberry Pi Work as a Mini PLC?
Yes. With the right software and interface hardware, a Raspberry Pi can perform many basic PLC functions such as:
- Reading digital inputs
- Controlling digital outputs
- Executing ladder logic programs
- Monitoring sensors
- Communicating over industrial protocols
- Sending data to cloud platforms
However, it should mainly be used for education, laboratory projects, home automation, and prototype development rather than critical industrial applications. Engineers on automation forums commonly recommend Raspberry Pi for learning PLC concepts but note that industrial PLCs remain the preferred choice for production environments.
Components Required
To build a simple Raspberry Pi-based mini PLC, you will need:
- Raspberry Pi 4 or Raspberry Pi 5
- MicroSD card
- Power supply
- Relay module
- Push buttons
- LEDs
- Sensors (optional)
- Breadboard and jumper wires
- Ethernet or Wi-Fi connection
For advanced projects, industrial I/O modules can also be added.
Step-by-Step Setup
Step 1: Install Raspberry Pi OS
Download and install Raspberry Pi OS on the microSD card using the Raspberry Pi Imager.
After booting the Raspberry Pi:
- Update the operating system
- Configure network settings
- Enable SSH if remote programming is required
Step 2: Install PLC Runtime Software
A Raspberry Pi requires PLC software capable of executing control logic.
Popular options include:
- OpenPLC Runtime
- CODESYS (supported versions)
- Node-RED for automation workflows
These platforms allow students to create ladder logic or function block programs similar to industrial PLC programming.
Step 3: Connect Input and Output Devices
Connect simple hardware such as:
- Push buttons as digital inputs
- LEDs as digital outputs
- Relay modules to switch external loads
- Temperature or proximity sensors
These devices help simulate real industrial control systems.
Step 4: Write Your First PLC Program
A beginner project could include:
- Press a push button.
- Turn on an LED.
- Switch off the LED after five seconds.
- Repeat the cycle.
This introduces concepts like timers, digital inputs, and outputs that are commonly used in industrial automation.
Step 5: Test and Monitor
Run the program and monitor:
- Input status
- Output status
- Timer operation
- Communication between devices
Testing helps verify that the control logic behaves as expected before moving on to larger automation projects.
Advantages of Using Raspberry Pi as a Mini PLC
Learning with Raspberry Pi offers several benefits:
- Affordable hardware
- Easy to program
- Supports multiple programming languages
- Compatible with IoT applications
- Large online learning community
- Suitable for automation experiments
- Supports networking and cloud connectivity
It provides an excellent introduction to Industry 4.0 concepts.
Raspberry Pi vs Industrial PLC
| Feature | Raspberry Pi | Industrial PLC |
|---|---|---|
| Purpose | Learning and prototyping | Industrial automation |
| Operating System | Linux | Real-time industrial firmware |
| Reliability | Moderate | Very High |
| Industrial Protection | Limited | Designed for harsh environments |
| Cost | Low | Higher |
| Best Use | Education, IoT, prototypes | Factory automation |
For students, Raspberry Pi is an affordable platform to understand automation fundamentals before working with industrial PLCs.
Skills You Will Learn
Working with Raspberry Pi helps develop practical skills such as:
- Digital input and output control
- Basic PLC programming
- Ladder logic concepts
- Sensor interfacing
- Relay control
- Industrial communication basics
- IoT integration
- Automation troubleshooting
These skills complement industrial PLC training and improve overall understanding of automation systems.
Career Opportunities
Knowledge of Raspberry Pi and PLC programming can support careers in:
- PLC Programming
- Industrial Automation
- Control Systems Engineering
- IoT Development
- Embedded Systems
- Robotics
- Smart Manufacturing
- Industrial Maintenance
Employers increasingly value engineers who understand both traditional automation and modern connected technologies.
Learn Industrial Automation with Practical Training
Understanding Raspberry Pi is useful, but industries still rely heavily on PLCs, HMI, SCADA, VFDs, and industrial communication systems. A structured training programme should cover all these technologies with hands-on practice.
CADCAMGURU’s Automation Certified Engineer (ACE) programme includes practical training on Siemens, Allen-Bradley, Delta, and Fuji PLCs, along with HMI, SCADA, panel design, communication protocols, IoT, and Raspberry Pi-based applications.
You can also explore the Industrial Automation Short-Term Courses for focused PLC and SCADA training:
https://cadcamguru.com/industrial-automation/industrial-automation-short-term-courses/
Ready to Start Your Industrial Automation Career?
Learning with Raspberry Pi is an excellent way to understand automation concepts, but combining it with practical PLC, SCADA, HMI, and industrial hardware training prepares you for real manufacturing environments.
Apply for the CADCAMGURU Industrial Automation Course:
https://cadcamguru.com/industrial-automation/placement-courses/automation-certified-engineers-ultimate/
You can also complete your application through the CADCAMGURU Admission Page:
https://cadcamguru.com/admission/
New Industrial Automation batches begin regularly. Early registration helps you secure your preferred batch and start building practical automation skills.
Contact CADCAMGURU
- Phone / WhatsApp: +91 9168603427 / +91 9168601733
- Email: enquiry@cadcamguru.com
