Wearable Device for Breast Self-Examination: Palpreast

Wearable Device for Breast Self-Examination: Palpreast

Purposely designed parts

The acquisition electronics, based on Arduino DUE board (Figure 1), is designed to sequentially select all the taxels of the matrix and to measure their electrical resistance: rows are selected by sequentially providing the Vcc (3.3 V) using the Digital Ports of the microcontroller, while the 4 columns are identified through 4 different Analog Ports.

The resistive change related to the applied force, is converted to voltage by a resistive voltage divider, with the fixed resistance of 10 kOhm, and the voltage signal is digitised by an analogue-to-digital converter (12-bit ADC) integrated in an Arduino DUE board Figure 2.

Figure 1 - Electronic scheme: the matrix rows are connected to digital pins 9, 10, 11, 12; The matrix columns are connected to analogic pins: A0, A1, A2, A3 through a voltage divider with R=10 kOhm.

Figure 2 - Read-out circuit for the taxels

A firmware (Figure 3) designed with Arduino IDE is uploaded on the Arduino board and the digital values of the matrix are transmitted through the Serial Port.

Figure 3 - - Palpreast algorithm implemented in the firmware