• capacitor sensor
• UV sensor
• NFC

The objective of this thesis is the creation of an integrated bracelet with NFC technology and a UV sensor, through which we aim to prevent burns caused by the UV rays of the sun that cause an increased risk of melanoma to the skin, and a sensor of capacity able to detect the degree of sweating of the patient's skin, declaring if he is in a state of dehydration, a parameter particularly useful for those suffering from ailments such as diabetes or cardiovascular diseases.The innovation presented by this thesis project is the communication method that occurs through the wireless short-range information exchange of NFC (near-field communication), which is an evolution of RFID (Radio Frequency Identification) which operates at frequency of 13.56 MHz and can reach a maximum transmission speed of 424 kbit/s. In batteryless mode, the tag is completely passive. In this mode, the NFC-enabled sensor collects energy from incoming RF emissions (from a mobile device) to power the sensor interface and RF transmissions.
The electronic part consists of a PE plate on which the NFC loops are printed that connect to a microprocessor (ST85), which is activated when a device activates the NFC loops, and this to a microcontroller (ATtiny85) which regulates the flow of information to be sent to the two sensors, one for capacity and one for detecting UV rays (ML8511).
The casing is the external part of the technology that serves to protect the electrical part from erosion or falls. It is made up of two parts which, by slipping through two lateral channels positioned on the side of the main casing, prevent the chip from coming out and breaking, however leaving the two sensors uncovered for their purposes.
The entire enclosure is designed with Fusion360 software and made by molding PLA with a 3D printer.
Others software created are:
Arduino: To program the ATtiny85 microcontroller.
Appinventor: To create the interface with the user.
A capacitive sensor is a particular type of sensor that measures the variation of the electrical capacity, an essential tool if we wanted to check the dryness of a layer.
The CapacitiveSensor library transforms two or more Arduino pins into a capacitive sensor, which can detect the electrical capacity of the human body.
The ML8511UV sensor is an easy to use ultraviolet light sensor. The MP8511 UV sensor emits an analog signal in relation to the amount of UV light it detects. This can be useful in creating devices that warn the user of sunburn or detect the UV index.
The interconnection between the device and the patient is represented by an application which, easy to use, shows the patient the various values.
The application was created by me through the Appinventor software, an open source software for creating Android applications used in this project to create a simple interface through which the user can view and save the parameters.
It consists of a graphic part and a logic. The first one is the part which we will see when we will open the app and the second one is the command for the user when he's clicking on the app.