TECHNICAL SPECIFICATIONS
The aim of this part of the project, is to solve the initial problems and get the objectives achieved by specifications, so hereafter you can learn about them.
MECHANICS
Hand movement and precision tracking
To analyse the capacity of the sensor to track the hand movement, we compare the full-scale range of the gyroscope and accelerometer with the cinematic equation of a hand motion.
The technology to analyse that data can achieve enough precision tracking to determine every time the movement of the prototype.
The strategy to use different type of flex sensor depending of each finger and put the motion sensor in a specific place will be the key of obtaining certain data to filter and interpret.
STRUCTURE CASE
WHY 3D PRINTING?
There are multiple reasons why we've chosen 3D printing such as:
Easy Prototyping
Cost reduction
Personalization
Functionality
Sustainability
MATERIALS
We made a research of which would be the best material for our structure case, we found two possible materials: TPU and PLA.
Although TPU had better and higher biocompatibility than PLA, we opted for PLA because the biocompatibility required in this project it’s of low degree. Furthermore, the PLA is much cheaper (the TPU costs at least twice) and we have it available in the University of Vic.
ELECTRONICS
MICROCONTROLLER
ARDUINO NANO
This microcontroller has a flash memory of 32kb and a clock speed of 16MHz. This device is better than other ones because of its small and compact size, the eight analogic inputs and the breadboard pins encapsulated. The device has 5V and 3V3 supply outputs to power our sensors.
Flex Sensor
SEN-08606
We are going to use five of this sensors (one per each finger) with a 4.5’’ length, to read the fingers flexion and then decode the position of each one separately.
Motion capture
MPU-9250
To capture the movement and oscillation of the hand we need to control at least six degrees of freedom, three of the movement and three of rotation. For this reason, we have chosen the MPU-9250 module, which can capture up to nine degrees of freedom, with an accelerometer, a gyroscope and a compass.
Electronics Preliminary scheme
After all the components are shown, in the following photo you will see the preliminary scheme of our glove.
