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access icon free Hardware design and software development of a motion control and driving system for transradial prosthesis based on a wireless myoelectric armband

© The Institution of Engineering and Technology
Received 09/04/2018, Accepted 27/11/2018, Revised 19/10/2018, Published 03/12/2018

This research work presents the design of the electronics modules of Adam's Hand, a transradial myoelectric prosthesis based on an innovative mechanism which can actuate five three-phalanges fingers (15 degrees of freedom) with just one motor, instead of the five/six motors conventionally used in other prosthetic devices; moreover, the prosthesis uses two servomotors to actuate the wrist movements. Adam's Hand fingertips are provided with temperature and pressure sensors, while the user myoelectric signals are acquired wirelessly by means of the Myo armband, a wearable device provided with eight electromyography electrodes, a nine-axis inertial measurement unit, and a transmission module. These data are received through an HM-11 BLE module, connected to Adam's Hand custom PCB, which features an Arduino Micro board. This board processes all the data and drives the actuators by means of properly chosen drivers. A Raspberry Pi 3 board manages a touchscreen display – which can be used to visualise the gathered data – and sends them to a dedicate cloud platform, so that the orthopaedic technicians who take care of Adam's Hand users can monitor them in real time, thus improving their recovery during the rehabilitation period.

Inspec keywords: haptic interfaces; biomedical electrodes; prosthetics; patient rehabilitation; pressure sensors; orthopaedics; medical signal processing; electromyography; servomotors; microcontrollers; motion control; temperature sensors; biomedical electronics; medical control systems

Other keywords: software development; HM-11 BLE module; driving system; rehabilitation period; servomotors; temperature sensors; electronics modules; dedicated cloud platform; Adam's Hand users; hardware design; user myoelectric signals; three-phalanges fingers; nine-axis inertial measurement unit; Adam's Hand custom PCB; transradial prosthesis; wireless myoelectric armband; actuators; wrist movements; pressure sensors; transradial myoelectric prosthesis; Adam's Hand fingertips; prosthetic devices; motion control; wearable device; motors; Raspberry Pi 3 board; transmission module; electromyography electrodes; Myo armband; Arduino Microboard; touchscreen display

Subjects: Spatial variables control; Pressure measurement; Actuating and final control devices; Pressure and vacuum measurement; Electrodiagnostics and other electrical measurement techniques; Signal processing and detection; Biology and medical computing; Bioelectric signals; Prosthetic and orthotic control systems; Digital signal processing; Thermometry; Thermal variables measurement; Prosthetics and other practical applications; Sensing devices and transducers; Electrical activity in neurophysiological processes; Prosthetics and orthotics; Interactive-input devices

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