# Analysis of Stability and Functionality of Coil and Piezoelectric Braille Modules Under Varying Temperature Conditions

## TL;DR

This study compares the performance of coil and piezoelectric Braille modules under different temperatures, finding that piezoelectric modules are more reliable in a wider temperature range.

## Contribution

The novel contribution is the systematic evaluation of Braille module stability and functionality across a broad temperature range.

## Key findings

- Piezoelectric modules showed stable operation from -30°C to +50°C.
- Coil modules experienced self-jamming and overheating above 20°C.
- Thermal expansion and lubrication issues likely caused coil module failures.

## Abstract

In this study, the performance and reliability of two different types of Braille modules, i.e., coil and piezoelectric, under varying temperature conditions were compared. The coil module works on the principle of electromagnetic forces generated by coils, while the piezoelectric module is based on the deformation of piezoelectric materials under electric voltage to move needles. The main purpose of this research was to discuss the stability and functionality of both modules within the temperature range from −30 °C to +50 °C. One thousand cycles of operation were conducted for each temperature step in 5 °C increments, focusing on the correctness of needle movement and system reliability. The results demonstrated that the piezoelectric module exhibited stable operation over the entire temperature range, while the coil module showed instabilities, such as self-jamming and overheating, above 20 °C. These problems were probably due to thermal expansion and reduced lubrication efficiency. These results underscore the piezoelectric module’s improved adaptation to high-temperature operation, making it a promising solution for applications requiring reliable operation under varying conditions.