IncluSim: An Accessible Educational Electronic Circuit Simulator for Blind and Low-Vision Learners

Research Background and Problem

• Problem and Challenges
  Traditional electronic circuit simulators primarily rely on visual interaction, including dragging and dropping components, drawing digital connections, and representing simulation results through graphical outputs. This approach is highly unfriendly to blind and low-vision (BLV) learners. BLV learners often face unjust barriers related to visual design, spatial annotation, and the operation of complex instruments, making it difficult for them to effectively engage in electronic circuit simulation practices.

• Significance
  Circuit simulation is a critical component of electronic engineering education, allowing students to quickly explore circuit behavior through theoretical simulations before implementing real hardware. However, the limitations of existing tools prevent BLV learners from equally benefiting from this type of learning, significantly restricting educational equity and the development of technical skills.

• Research Motivation and Related Work
  Although existing research has improved accessibility in electronics education through tactile circuit diagrams and audio feedback, there is a lack of solutions specifically designed for BLV individuals in the development of electronic circuit simulation tools. To address this gap, the authors propose IncluSim, a hardware-digital hybrid circuit simulation tool, developed through a 2.5-year co-design process.

Solution

• Main Approach and Solution
  IncluSim is an open-source, BLV-friendly circuit simulation toolset that includes tactile hardware components (such as touchpads and circuit modules with braille labels) and a voice-supported digital interface. This combination enables learners to complete circuit design, simulation, and debugging through a grid-based design process.

• Innovations

  • Integration of tactile hardware (braille labels, grid boards) with an accessible digital interface.
  • Use of co-design, involving both BLV and sighted researchers to ensure the tool meets community needs.
  • Introduction of low-cost and scalable hardware design (hardware costs reduced from $247 in the prototype phase to $8.5 in later stages), making it easy for educators to replicate.

• Implementation Steps and Techniques

  1. Needs Discovery Phase: Analyze the barriers BLV learners face in circuit education, such as the visual dependency of existing tools.
  2. Low-Fidelity Prototype Development: Build initial hardware and software prototypes, including tactile modules and a digital interface.
  3. Co-Design (RAD Program):
     • First round of design research (RAD 1.0) to identify key improvement areas through user feedback.
     • Second round of design research (RAD 2.0) to introduce an interactive tutorial and improved hardware design.
  4. Comprehensive Refinement: Use LTSpice simulation software as backend support, while integrating keyboard shortcuts, tactile enhancements, and screen reader-friendly content.

Research Outcomes

• Key Results

  • Successfully developed IncluSim, a BLV-friendly circuit simulation tool.
  • BLV learners were able to design, simulate, and debug circuits, as well as verify theoretical calculations.
  • The introduction of hardware grids and a digital interface significantly simplified navigation and reduced the cognitive load of complex circuits.

• Advantages

  • Compared to existing tools, IncluSim addresses major educational technology barriers faced by BLV individuals through its comprehensive accessibility and hardware-digital integration.
  • User feedback indicates that it not only reduces the learning curve but also provides instant error prompts and simulation results to support learning.

• Experiments and Evaluation

  • Two rounds of experiments were conducted: RAD 1.0 and RAD 2.0. RAD 2.0 incorporated user feedback-driven improvements, such as reducing hardware size, increasing color contrast, and introducing targeted tutorials.
  • BLV participants rated the "tool accessibility" of RAD 2.0 on a 5-point scale, with the average score increasing from 2.75 to 4.33.

• Limitations and Future Directions

  • The current digital tool is optimized only for MacOS and the VoiceOver screen reader; future work should expand support to more operating systems and assistive technologies.
  • The tool has not yet been tested in full classroom settings; future plans include validating its applicability in group teaching environments.
  • Explore the potential for advanced simulations (e.g., AC analysis) and audio waveform visualization.
  • Investigate the development of a fully digital version to enable broader dissemination while maintaining cognitive offloading capabilities.

IncluSim significantly enhances the participation and comprehension of BLV learners in electronics education by presenting circuit content through multi-tactile and multi-data channels. This not only addresses a critical gap in technology development but also provides a sustainable new pathway for educational equity.