BIOARMBAND

A wearable is a connected device that can be worn, since a component can be added to any object that will make it intelligent. The most common ones record what we cannot see with the naked eye, such as heart rate, our breathing rate, hours of sleep, well-being, or stress. Some examples of wearables are objects such as glasses, headphones, bracelets, t-shirts, belts, watches, socks, or shoes. Many often confuse them with smartphones, but the difference is that these are integrated into our bodies, in some way freeing the user's hands (Kinza Yasar & Wigmore, 2022).

The Attiny85, a small microcontroller, with which we can carry out small projects, in which we do not need a large amount of memory or inputs or outputs. We can program this micro with our Arduino desktop environment. There is a whole process where you can program your Arduino for programming your Attiny85 (“Electromaker,” 2017).

Nowadays people use the wearables for health monitoring, so they can track and receive multiple notifications of how their heart rate, or even their blood pressure, are at that exact moment.

The sensors that we were going to use for this project are the MAX30102, and a Sensor Mlx90614 M011, that's why I thought that would be nice to give a brief explanation of each sensor.

The MAX30102 is an integrated pulse oximetry and heart-rate monitor biosensor module. It includes internal LEDs, photodetectors, optical elements, and low-noise electronics with ambient light rejection. The MAX30102 provides a complete system solution to ease the design-in process for mobile and wearable devices (“MAX30102 Datasheet and Product Info | Analog Devices,” 2015).

The Sensor GY-906 MLX90614 can measure ambient temperature based on the resistance of the thermistor on the board.Connect module power line (middle) and ground (-) to 5V and GND on the Arduino respectively. Connect the module signal pin (S) to pin A0 on the Arduino.

References

• Electromaker. (2017). Retrieved October 26, 2023, from Electromaker.io website: https://www.electromaker.io/blog/article/introduction-to-the-attiny85-19
• Kinza Yasar, & Wigmore, I. (2022). wearable technology. Retrieved October 26, 2023, from Mobile Computing website: https://www.techtarget.com/searchmobilecomputing/definition/wearable-technology
• MAX30102 Datasheet and Product Info | Analog Devices. (2015). Retrieved October 26, 2023, from Analog.com website: https://www.analog.com/en/products/max30102.html#product-overview
• ‌Digital plug & play infrared thermometer in a TO-can. (2023). Retrieved October 26, 2023, from Melexis website: https://www.melexis.com/en/product/mlx90614/digital-plug-play-infrared-thermometer-to-can#:~:text=The%20MLX90614%20is%20an%20infrared,the%20same%20TO%2D39%20can.

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Supplies

In this project, these were the materials:

• Sensor MAX30102
• Sensor GY-906 MLX90614
• Attiny85
• Push Button
• Resistencia 1kohm
• Cables dupont
• Arduino UNO

Step 1: Brainstorm

For this project, as it was thought to be a device that animals and people could use, simply changing its design and the corresponding measurements depending on their system, what was done was to use three sensors that both populations could use; so it is important to mention that the three sensors that were used measure important vital signs to care for their health and well-being.

Step 2: Investigate the Data Sheet of Each Sensor

Here we colocated the datasheet of each sensor in order for you to understand the pinout and some important specifications for you to consider it.

Step 3: Colocate Them in a Protoboard

Here it's the image of how to connect them.

Step 4: Programming

It was used three sensors, but the MAX3102 has two of them, that's why there are only two programs.

Attiny Core it's important for programming both codes, here is the link:

https://github.com/SpenceKonde/ATTinyCore/blob/v2.0.0-devThis-is-the-head-submit-PRs-against-this/Installation.md

Code of the

• Hackster.io. (2019, October 29). ATtiny85 Pulse Oximeter and Photoplethysmograph. Retrieved October 26, 2023, from Hackster.io website: https://www.hackster.io/jeffreymagee/attiny85-pulse-oximeter-and-photoplethysmograph-e3f907

Step 5: Check That Everything Works Correctly

We could check that everything was working properly, because one showed the temperature and the other was showing the blood pressure and the heart beats per minute.

Step 6: PCB Design

The circuit was made in a schematic to later update it in PCB form. We also made the PCB by the "Planchado" method, in which we suggest you to follow the following video. We leave you the circuits for you to print them, if you want to do it that way.

Step 7: 3D Printing

Throughout this project, we also undertook the design of an enclosure to safeguard our circuit. Within it, we incorporated a dedicated area to display the screen, facilitate button usage, and allow for audible output from the buzzer. On the opposite side of the enclosure, provision was made for direct contact of the sensor—be it for heart rate and oxygenation or temperature—with the skin to accurately present the corresponding results.

Step 8: Final Result

After colocating the proper design, make sure the PCB and the 3D structure fits and works properly. That's it, we think with this you can have walks on the street with your pet, without it getting sunburned and at the same time you take care of your health.