Week 18 - Applications and Implications, Project Development

1. What Does It Do?

Smart Lean Cell is an educational manufacturing cell that turns Lean Manufacturing into a physical and measurable experience for children. The user does not only read about Lean; the user performs an assembly activity, moves a part through a process and receives immediate feedback from the workstation.

• Learning action: the child organizes components, assembles a product and moves it from inventory to finished goods.
• Physical feedback: colored trays, stations and LEDs show the state of the process.
• Digital feedback: the Blynk dashboard displays distance values, cycle time, average cycle time, inventory count, finished pieces and productivity.
• Educational purpose: the child understands that order, standard work and measurement can improve a process.

In practice, the system works as a small Lean dojo. It allows the facilitator to compare a chaotic process with an organized process and then with a monitored process. This makes the learning path progressive and easier to understand.

2. Who Has Done What Beforehand?

The project is based on ideas that already exist in industrial training and education: Toyota Production System simulations, 5S workstations, Lean dojos, classroom production games and STEM kits. These previous works show that people learn process improvement better when they can see the problem and test a new method.

My project adapts those ideas to a Fab Academy context. Instead of buying a commercial training kit, I fabricated the cell using CNC machining, laser cutting, 3D printing and a custom PCB. The novelty is not claiming that Lean or assembly games are new; the contribution is creating a compact, child-oriented, digitally fabricated and sensorized version that can be replicated or modified in a Fab Lab.

I also reviewed previous Fab Academy work to understand how other students approached similar technical or educational problems. These projects did not solve the same problem as Smart Lean Cell, but each one contributed a useful precedent: wireless communication with Blynk, ultrasonic sensing, child-centered tangible interfaces, time measurement and integrated IoT prototypes.

• From Lean dojos: preparation before production and practice-based learning.
• From 5S: a defined place for every component and tool.
• From STEM education: learning through manipulation, experimentation and feedback.
• From Fab Academy: integration of design, fabrication, electronics, programming and documentation.

3. What Did I Design?

I designed the Smart Lean Cell as a system, not as isolated parts. The design includes the learning sequence, the physical workstation, the organization tools, the electronic control layer and the dashboard. Each element was designed with two criteria: it had to work technically, and it had to be understandable for children.

• Mechanical design: CNC press-fit assembly module, monitor support area and work surface.
• Lean tools: laser-cut physical panel and 3D printed Kanban trays for visual organization.
• Electronics: KiCad PCB for the XIAO ESP32-C3, headers, voltage dividers, sensors and LEDs.
• Packaging: 3D printed PCB case to protect the electronics and present the system cleanly.
• Software: Arduino IDE code for sensor reading, cycle timing, LED logic and Blynk communication.
• Interface: Blynk dashboard with production indicators.
• Game logic: three levels: chaos, synchronization and data-driven optimization.

The design therefore connects physical layout, human behavior and data collection. The objective was to make the workstation itself teach the idea of flow and waste reduction.

4. What Sources Did I Use?

The project used both technical and conceptual sources. Technical sources helped me fabricate and program the prototype. Conceptual sources helped me define what the learning experience should communicate.

• Fab Academy weekly work: CAD, CNC, electronics production, input devices, output devices, networking, interface programming and system integration.
• Software tools: Fusion 360 for design, KiCad for PCB design, Arduino IDE for embedded programming and Blynk for dashboard development.
• Component references: XIAO ESP32-C3, HC-SR04 sensors, LEDs, resistors and voltage-divider logic.
• Industrial engineering concepts: TPS, Lean Manufacturing, 5S, standard work, visual management, cycle time and Therbligs.
• Local support: Industrial FabLab UCuenca infrastructure, instructor feedback and project validation with users.

These sources were not used as disconnected references. They were translated into design requirements: low-cost materials, visible process states, measurable performance, modular fabrication and a safe learning environment.

5. What Materials and Components Were Used?

The material selection followed the educational nature of the project. I selected accessible materials that can be fabricated locally and replaced easily if the prototype is replicated in another Fab Lab or classroom.

• Structural materials: plywood/MDF for the CNC workstation and laser-cut physical panel.
• 3D printing materials: PLA for trays, stations and custom supports.
• Electronic materials: copper PCB board, XIAO ESP32-C3, HC-SR04 sensors, LEDs, resistors, headers and jumper wires.
• Interface materials: monitor/computer for the Blynk dashboard and USB cable for power/programming.

The use of PLA and plywood also supports iteration. If a tray or panel dimension changes, the part can be redesigned and fabricated again quickly.

6. Where Did They Come From?

The fabricated parts came from the digital fabrication workflow at Industrial FabLab UCuenca. This includes the CNC machining of the structure, laser cutting of the panel, 3D printing of trays and fabrication of the PCB. Electronics came from laboratory stock and standard maker suppliers.

This matters because the project follows the Fab Academy principle of making as much as possible instead of buying a finished product. I bought or used stock components only where it made sense: microcontroller, sensors, LEDs, resistors and wiring. The value of the project is in the designed integration of these elements.

7. How Much Did It Cost?

The project was planned as a low-cost prototype. The largest variable costs are the wood sheet, filament, microcontroller and sensors. Since prices vary by country and supplier, the BOM includes estimated cost ranges and reference purchase links.

The cost strategy is important for future use. If the Smart Lean Cell is used in schools or workshops, the design must be affordable enough to fabricate more than one station or replace parts after repeated use. For that reason, the project avoids expensive industrial sensors or proprietary automation hardware.

8. What Parts and Systems Were Made?

The final prototype is made from several subsystems that work together. The mechanical system holds the workstation. The organization system controls the way parts are presented. The electronic system detects events. The dashboard system visualizes the process. The gamification system gives meaning to the activity.

• CNC workstation: supports the whole learning cell.
• Laser-cut panel: defines the physical organization surface.
• 3D printed trays: separate materials and support visual control.
• Custom PCB: connects sensors, LEDs and XIAO ESP32-C3.
• Sensor stations: detect inventory exit and finished product arrival.
• Dashboard: receives and displays process information.
• Learning levels: structure the activity for children.

9. What Processes Were Used?

The project integrates multiple Fab Academy processes. Each process was selected because it solved a specific need in the system. CNC machining gave structural rigidity, laser cutting gave fast 2D organization elements, 3D printing gave customized trays, PCB fabrication gave a cleaner electronic system, and programming connected the physical activity to real-time data.

• 2D design: DXF files for CNC and laser cutting.
• 3D design: trays, stations and PCB case modeled for printing.
• Subtractive fabrication: CNC machining of the assembly module.
• Additive fabrication: PLA printing of modular trays and holders.
• Electronics production: PCB design, fiber laser fabrication and soldering.
• Embedded programming: sensor logic, LED logic and cycle-time calculation.
• Networking: Wi-Fi communication with Blynk dashboard.

10. What Questions Were Answered?

The development answered questions at three levels: educational, mechanical and electronic. Educationally, it tested whether children could understand Lean concepts by playing. Mechanically, it tested whether a fabricated workstation could support the complete activity. Electronically, it tested whether simple sensors could measure the process in a meaningful way.

• Can Lean be introduced to children without using complex industrial language?
• Can a disorganized process be compared with an organized process through play?
• Can HC-SR04 sensors detect inventory exit and finished product arrival reliably enough for learning?
• Can cycle time become a visible indicator for improvement?
• Can a Fab Lab produce all main physical tools for this learning experience?

11. What Worked and What Did Not?

The main systems worked: the CNC module supported the cell, the trays organized components, the PCB connected the electronics, the sensors detected process events, the LEDs gave visual feedback and Blynk displayed live indicators. The project also worked as a learning experience because children could interact with it and understand the activity through colors, movement and feedback.

The main problems were related to refinement. Cable organization needed improvement, sensor placement required adjustment, and the dashboard indicators needed to be explained in a child-friendly way. These issues did not block the prototype, but they showed what should be improved in the next version.

12. How Was It Evaluated?

The evaluation combined technical testing and user validation. I checked whether the sensor readings changed correctly, whether the LEDs represented the system state, whether the dashboard received data and whether cycle time was calculated from the intended events: Sensor 1 stops detecting to start the cycle, and Sensor 2 detects the finished object to end the cycle.

User validation was done by observing children interacting with the workstation. This was essential because the intended users are not engineers. The prototype had to be understandable, attractive and safe enough for them to use while still communicating the industrial engineering ideas behind the activity.

13. What Are the Implications?

The main implication is educational. Smart Lean Cell shows that digital fabrication can create meaningful tools for teaching industrial engineering concepts to children. It also shows that Lean, TPS and optimization do not need to be introduced only at university or company level; they can be transformed into age-appropriate STEM experiences.

For Fab Labs, the project demonstrates a path for creating educational manufacturing cells from local resources. For schools, it offers a playful way to discuss organization, time, teamwork and improvement. For industrial engineering, it creates a bridge between professional methods and early STEM learning.