John Doe

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John Doe

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Author's posts

Arrival of ESP32

This week marked an important milestone for our project: after several delays and hardware issues, our new ESP32 finally arrived.

Arrival of ESP32

This week marked an important milestone for our project: after several delays and hardware issues, our new ESP32 finally arrived.

From Connectivity Issues to a Functional App

During the past few days, we focused on improving the mobile application and its communication with the system. One of the main challenges we faced was ensuring a stable transmission and reception of data between the sensors and the application itself. After several debugging sessions and connection tests, we were finally able to achieve a fully functional version of the app.

From Connectivity Issues to a Functional App

Are You Doing the Right Way

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Batteries

We chose 3.7V lithium cells instead of standard batteries (such as alkaline or 9V) because the ESP32 requires high current peaks for Wi-Fi communication, which conventional batteries cannot reliably support.

Batteries

Bosch BMV080 with Shuttle Board

For monitoring fine particulate matter, we selected the Bosch BMV080 solid-state sensor mounted on the Shuttle Board 3.1. This device uses a high-precision laser to measure PM2.5 concentrations—microscopic particles that the World Health Organization identifies as critical for cardiovascular and respiratory health.

Bosch BMV080 with Shuttle Board

Power Module (5V Boost Converter)

We selected this specific 5V output module instead of a basic charger because our particulate sensor requires a stable 5V supply to ensure its internal fan operates reliably. Since the batteries can only provide up to 4.2V, this module boosts the voltage to the required 5V.

Power Module (5V Boost Converter)

Radon Monitoring (Future Considerations)

Although measuring radon gas was one of the initial objectives of the project—due to its high risk in indoor environments and its significant presence in the northern and central regions of Portugal—we decided not to integrate this type of sensor in the current version of the prototype due to economic feasibility constraints.

Radon Monitoring (Future Considerations)

SCD41

The integration of the SCD41 sensor by Sensirion is essential to our project, as it uses photoacoustic spectroscopy to measure actual CO₂ concentration—unlike low-cost sensors that only provide estimated values (eCO₂).

SCD41

Sensor BME690

We chose the Bosch BME690 instead of using multiple separate components because it is a 4-in-1 sensor capable of measuring temperature, humidity, pressure, and harmful gases (such as VOCs and carbon monoxide). We preferred this model over other common gas sensors due to its strong cost-effectiveness and low power consumption.

Sensor BME690

Simple Blog Post

Simple Blog Post

Simple Blog Post

Simple Blog Post

Simple Blog Post

Simple Blog Post

Choosing of the Equipment

With the support of the researchers we had the opportunity to meet and interview, combined with our own research and exploration of the topic, we selected the following sensors for our project: the Bosch BME690, the Bosch BMV080 with Shuttle Board, the Sensirion SCD41, along with 3.7V lithium cells.

Choosing of the Equipment

Meeting with Pedro Oliveira from eNGN Technologies

Recently, we met with Pedro Oliveira from eNGN Technologies, whose contribution was essential to the development of our project. This meeting allowed us to rule out radon measurement at this stage and make more informed decisions regarding the selection of sensors.

Meeting with Pedro Oliveira from eNGN Technologies

Meeting with INEGI

On March 16th, we met with Edite Vale, a spokesperson and researcher at INEGI, for an insightful discussion about our project. We presented our ideas, explored key questions, and gained valuable perspectives on some of the biggest challenges currently faced in the industry.