According to the World Health Organization, ergonomics is the science aiming to obtain maximum performance by reducing risks of human and technological errors, as well as potential hazards to the worker, while trying to reduce fatigue. Under this context, the present work is intended to develop an ergonomic pencil device capable of capturing graphological features that will help analyze psychological factors and to identify personality traits in individuals in the business or mental health environments. To validate the work with respect to the ergonomic perspective, 3 main aspects were studied: 1. Mathematical modeling for the analysis of deformations and tensions in the structure of a pencil, 2. Statistical validations to define sensor location sections where fingers will be placed, 3. Simulation of the geometry to verify results of established parameters. The results obtained from simulations will serve to define personality traits, and the statistical validations indicated whether the finger position average distance is adequate.