In collaboration with the 1st Year Students of the eu4m program: Ignacio, Eduardo, Mary, Nebojsca and Yi-Yong. Supervised by Prof J.Walter

This project involves work with microcontrollers, databases, and mobile applications. It is being developed as a part of the Micocontroller technology class at Hochshule Karlsruhe.

Main Idea:

A kit, to be easily integrated into any in-line skate, that helps the skater to learn faster and in a safer manner any desired trick or movement. Trough the measurement of the pressure applied in 4 pressure-points on the foot of the skater, and a comparaison with a refernce measurement, the skater will know where and when to apply more pressure while performing the trick.

How will it work?

The pressure information input of the user is recorded by 4 pressure transducers, located strategically on a hard insole additionally introduced into the skate. These sensors will be connected to an ESP32 microcontroller that will store the data on an SD card. Upon the press of a button, when the skater has finished practicing his/her tricks, several things will happen:

• The ESP32 stops recording and saving the data on the SD Card
• The Wifi module of the microcontroller is activated.
• Data will be transferred to the user’s smartphone connected to the same Wi-Fi network or trough Wifi-Direct
• When Data is transferred successfully, the file with previous data on the SD card is erased and the opti-skate kit is deactivated.
• The measuring process will restart upon device manual activation.

On the user’s smart device(i.e. smartphone)

The data package transmitted trough the Wifi network, as a txt file will contain two types of data and will be available in the following format:

Time log | Pressure log, Time log_1 | Pressure_log_1, … | …, Time log_n | Pressure log_n

This kind of notation will ease the pre-processing steps before effectively using it for comparaison with refernce values and later advice generation for the user.

Work is still on going on this part…

Detailed hardware description:

Batteries and casing, as well as insole setup will be added promptly…

Other alternatives, ideas and prototypes that were concieved during the development of this project, but eventually discarded: