• Wide range calibration method for direct interface circuits and application to resistive force sensors 

  Hidalgo-López, José Antonio; Oballe-Peinado, Óscar; Castellanos-Ramos, Julián; Tejero-Calado, Juan Carlos; Vidal-Verdú, Fernando (Institute of Electrical and Electronics Engineers, 2021-10-15)

  A novel approach to interface resistive sensors directly to a Field Programmable Gate Array (FPGA) is presented in this paper. The circuit is based on Direct Interface Circuits (DICs), which make the sensor reading through ...

• Two-capacitor direct interface circuit for resistive sensor measurements 

  Hidalgo-López, José Antonio; Oballe-Peinado, Óscar; Castellanos-Ramos, Julián; Sánchez-Durán, José Antonio (MDPI, 2021-02-22)

  Direct interface circuits (DICs) avoid the need for signal conditioning circuits and analog- to-digital converters (ADCs) to obtain digital measurements of resistive sensors using only a few passive elements. However, such ...

• Reducing measurement time in direct interface circuits for resistive sensor readout 

  Hidalgo-López, José Antonio; Sánchez-Durán, José Antonio; Oballe-Peinado, Óscar (MDPI, 2020-05-02)

  Direct Interface Circuits (DICs) carry out resistive sensor readings using a resistance-to-time-to-digital conversion without the need for analog-to-digital converters. The main advantage of this approach is the simplicity ...

• Quasi single point calibration method for high-speed measurements of resistive sensors 

  Botín-Córdoba, Jesús Alberto; Oballe-Peinado, Óscar; Sánchez-Durán, José Antonio; Hidalgo-López, José Antonio (MDPI, 2019-09-30)

  Direct interface circuits are a simple, inexpensive alternative for the digital conversion of a sensor reading, and in some of these circuits only passive calibration elements are required in order to carry out this ...

• Tri-axial tactile sensing element. 

  Castellanos-Ramos, Julián; Navas-González, Rafael Jesús; Vidal-Verdú, Fernando (2013)

  A 13 x 13 square millimetre tri-axial taxel is presented which is suitable for some medical applications. Finite Element Analysis is carried out to determine what structure is the best to obtain a uniform distribution of ...

• Fast Calibration Methods for Resistive Sensor Readout Based on Direct Interface Circuits 

  Hidalgo-López, José Antonio; Botín-Córdoba, Jesús Alberto; Sánchez-Durán, José Antonio; Oballe-Peinado, Óscar (MDPI, 2019-09-07)

  A simple method to measure the resistance of a sensor and convert it into digital information in a programmable digital device is by using a direct interface circuit. This type of circuit deduces the value of the resistor ...

• Practice Projects for an FPGA-Based Remote Laboratory to Teach and Learn Digital Electronics 

  Navas-González, Rafael Jesús; Oballe-Peinado, Óscar; Castellanos-Ramos, Julián; Rosas-Cervantes, Daniel; Sánchez-Durán, José Antonio (MDPI, 2023-10-12)

  This work presents examples of practice sessions to teach and learn digital electronics using an FPGA-based development platform, accessible either through the on-campus laboratory or online using a remote laboratory ...

• Uso de IA para fomentar el estudio de teoría en asignaturas de Instrumentación Electrónica 

  Vidal-Verdú, Fernando; Navas-González, Rafael Jesús (TAEE, 2024-06-26)

  Este trabajo propone el uso de las herramientas de Inteligencia Artificial (IA) para hacer más atractivo el aprendizaje de conceptos fundamentales o llamados teóricos y la memorización de información en estudios de ingeniería. ...

• Explorando Chat-GPT para su uso en las asignaturas de Instrumentación Electrónica y Biomédica. 

  Navas-González, Rafael Jesús; Vidal-Verdú, Fernando (TAEE, 2024)

  En este trabajo se explora el uso de la Inteligencia Artificial Generativa (Chat-GPT) en las asignaturas Instrumentación Electrónica e Instrumentación Biomédica como herramienta para introducir y afianzar conceptos teóricos, ...

• Texture Detection With Feature Extraction on Embedded FPGA 

  Lora Rivera, Raúl; Oballe-Peinado, Óscar; Vidal-Verdú, Fernando (Institute of Electrical and Electronics Engineers Inc., 2023-04-25)

  A feature extraction algorithm for texture detection oriented to its implementation on embedded electronics based on a field-programmable gate array (FPGA) is proposed in this article. Local preprocessing with smart tactile ...

• Equilibration device for tactile sensors on curved surfaces 

  Castellanos-Ramos, Julián; Carrasco-García, Álvaro; Navas-González, Rafael Jesús; Trujillo-León, Andrés; Vidal-Verdú, Fernando (IEEE, 2017)

  Tactile sensors are arrays of force sensing units called taxels and equilibration is necessary to normalize their response. This is commonly done by applying uniform pressure while the sensor lies on a flat surface. However, ...

• Assistive Handlebar Based on Load Cells as Attendant Steering Device 

  Trujillo-León, Andrés; Sánchez-Sánchez, Cristina; Castellanos-Ramos, Julián; Vidal-Verdú, Fernando (IEEE, 2018)

  The increase in the life expectancy has pushed the interest in developing assistive technologies to extend the autonomy of the elderly. Mobility is a major concern for this population, and aids should be designed to be ...

• Evaluation of tactile sensors as an alternative to force sensors in an assistive haptic handlebar 

  Trujillo-León, Andrés; Bachta, Wael; Vidal-Verdú, Fernando (IEEE, 2017)

  This paper shows experimental results that confirm that tactile sensors are appropriate to provide information about the caregiver intention in an assistive haptic handlebar. Preliminary tests have been performed to identify ...

• A tactile handle for cane use monitoring 

  Trujillo-León, Andrés; Ady, Ragou; Vidal-Verdú, Fernando; Bachta, Wael (IEEE, 2015)

  Assistive ambulatory devices are used for gait rehabilitation and assistance. In both cases, their benefit is greater when they are used properly. As for canes, embedded sensors can be used for monitoring purposes. In this ...

• Tactile Sensor-Based Steering as a Substitute of the Attendant Joystick in Powered Wheelchairs 

  Trujillo-León, Andrés; Bachta, Wael; Vidal-Verdú, Fernando (IEEE Transactions on Neural Systems and Rehabilitation Engineering, IEEE, 2018)

  Attendant joysticks of powered wheelchairs are devices oriented to help caregivers. Diseases and disabilities such as dementia, spinal cord injuries or blindness make the user unable to drive the chair by his or her own. ...

• Assistive handlebar based on tactile sensors: control inputs and human factors 

  Trujillo-León, Andrés; Bachta, Wael; Castellanos-Ramos, Julián; Vidal-Verdú, Fernando (Sensors, MDPI, 2018)

  Tactile sensors can be used to build human-machine interfaces, for instance in isometric joysticks or handlebars. When used as input sensor device for control, questions arise related to the contact with the human, which ...

• Driving Interface Based on Tactile Sensors for Electric Wheelchairs or Trolleys 

  Trujillo-León, Andrés; Vidal-Verdú, Fernando (MDPI, 2014)

  This paper introduces a novel device based on a tactile interface to replace the attendant joystick in electric wheelchairs. It can also be used in other vehicles such as shopping trolleys. Its use allows intuitive driving ...

• Interface for tactile sensors based on direct connection to a FPGA 

  Oballe-Peinado, Óscar; Castellanos-Ramos, Julián; Hidalgo-López, José Antonio; Vidal-Verdú, Fernando; Macicior, Haritz; Ochoteco, Estíbalitz[et al.] (IEEE, 2009)

  Many artificial skins for robotics are based on piezoresistive films that cover an array of electrodes. Local preprocess- ing is a must in these systems to reduce errors and interferences and cope with the large amount of ...

• FPGA-Based Tactile Sensor Suite Electronics for Real-Time Embedded Processing 

  Oballe-Peinado, Óscar; Hidalgo-López, José Antonio; Castellanos-Ramos, Julián; Sánchez-Durán, José Antonio; Navas-González, Rafael Jesús; Herrán, Jaime; Vidal-Verdú, Fernando[et al.] (IEEE, 2017)

  Dexterity in robotic hands is not enough to cover the demands for more flexibility in the manufacturing process. Specifically, processes that involve cooperation or learning from humans, slippage detection and tactile ...

• Creep and Hysteresis Compensation in Pressure-Sensitive Mats for Improving Center-of-Pressure Measurements 

  Martínez-Cesteros, Javier; Medrano-Sánchez, Carlos; Castellanos-Ramos, Julián; Sánchez-Durán, José Antonio; Plaza-García, Inmaculada; martinez cesteros[et al.] (IEEE, 2023)

  Large-area tactile sensors are used to image the pressure exerted by human body parts. More specifically, they can be used to measure plantar pressure on human stability tests. The center-of-pressure (CoP) trajectory is ...

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