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Driving interface based on tactile sensors for electric wheelchairs or trolleys.

Trujillo-León A, Vidal-Verdú F - Sensors (Basel) (2014)

Bottom Line: When the user interacts with the handle of the chair or trolley, he or she exerts a pressure pattern that depends on the intention to accelerate, brake or turn to the left or right.These signals are equivalent to those provided by a joystick.This proposal aims to help disabled people and their attendees and prolong the personal autonomy in a context of aging populations.

View Article: PubMed Central - PubMed

Affiliation: Department of Electronics, University of Málaga, Málaga 29071, Spain. atrujilloleon@uma.es.

ABSTRACT
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 that requires little or no training, so its usability is high. This is achieved by a tactile sensor located on the handlebar of the chair or trolley and the processing of the information provided by it. When the user interacts with the handle of the chair or trolley, he or she exerts a pressure pattern that depends on the intention to accelerate, brake or turn to the left or right. The electronics within the device then perform the signal conditioning and processing of the information received, identifying the intention of the user on the basis of this pattern using an algorithm, and translating it into control signals for the control module of the wheelchair. These signals are equivalent to those provided by a joystick. This proposal aims to help disabled people and their attendees and prolong the personal autonomy in a context of aging populations.

No MeSH data available.


Control electronics scheme.
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f5-sensors-14-02644: Control electronics scheme.

Mentions: Figure 5 shows the schematic of the control electronics. The rows of the matrix are connected to analog switches (ADG734, Analog Devices, Norwood, MA, USA) and the columns to transimpedance amplifiers (based on LMV324 operational amplifiers, Texas Instruments, Dallas, TX, USA). A microcontroller (PIC18F4680) scans the array by closing the switches sequentially through general purpose I/O ports. The addressed row is grounded while the other rows remain connected to a reference voltage (Vref). This is also the voltage at the non-inverting input of the amplifiers. In this way parasitic resistive paths are short circuited and crosstalk is canceled. The output voltage of the transimpedance amplifiers provides the force exerted on the tactels of the selected row. This voltage is digitalized by the analog-to-digital converter of the microcontroller and the force map is stored.


Driving interface based on tactile sensors for electric wheelchairs or trolleys.

Trujillo-León A, Vidal-Verdú F - Sensors (Basel) (2014)

Control electronics scheme.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3958251&req=5

f5-sensors-14-02644: Control electronics scheme.
Mentions: Figure 5 shows the schematic of the control electronics. The rows of the matrix are connected to analog switches (ADG734, Analog Devices, Norwood, MA, USA) and the columns to transimpedance amplifiers (based on LMV324 operational amplifiers, Texas Instruments, Dallas, TX, USA). A microcontroller (PIC18F4680) scans the array by closing the switches sequentially through general purpose I/O ports. The addressed row is grounded while the other rows remain connected to a reference voltage (Vref). This is also the voltage at the non-inverting input of the amplifiers. In this way parasitic resistive paths are short circuited and crosstalk is canceled. The output voltage of the transimpedance amplifiers provides the force exerted on the tactels of the selected row. This voltage is digitalized by the analog-to-digital converter of the microcontroller and the force map is stored.

Bottom Line: When the user interacts with the handle of the chair or trolley, he or she exerts a pressure pattern that depends on the intention to accelerate, brake or turn to the left or right.These signals are equivalent to those provided by a joystick.This proposal aims to help disabled people and their attendees and prolong the personal autonomy in a context of aging populations.

View Article: PubMed Central - PubMed

Affiliation: Department of Electronics, University of Málaga, Málaga 29071, Spain. atrujilloleon@uma.es.

ABSTRACT
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 that requires little or no training, so its usability is high. This is achieved by a tactile sensor located on the handlebar of the chair or trolley and the processing of the information provided by it. When the user interacts with the handle of the chair or trolley, he or she exerts a pressure pattern that depends on the intention to accelerate, brake or turn to the left or right. The electronics within the device then perform the signal conditioning and processing of the information received, identifying the intention of the user on the basis of this pattern using an algorithm, and translating it into control signals for the control module of the wheelchair. These signals are equivalent to those provided by a joystick. This proposal aims to help disabled people and their attendees and prolong the personal autonomy in a context of aging populations.

No MeSH data available.