Development of a Smartwatch with Gas and Environmental Sensors for Air Quality Monitoring
<p>Permeation tube diffusion process.</p> "> Figure 2
<p>Smartwatch design and its main menu.</p> "> Figure 3
<p>Smartwatch block diagram (<b>left</b>) and electronic board (<b>right</b>).</p> "> Figure 4
<p>Experimental setup for gas bottles.</p> "> Figure 5
<p>Permeation tube measurement setup.</p> "> Figure 6
<p>SGP40 response: (<b>a</b>) SGP40 CO<sub>2</sub> response; and (<b>b</b>) SGP40 CH<sub>4</sub> response.</p> "> Figure 7
<p>BME688 response: (<b>a</b>) BME688 CO<sub>2</sub> response; and (<b>b</b>) BME688 CH<sub>4</sub> response.</p> "> Figure 8
<p>ENS160 response: (<b>a</b>) ENS160 CO<sub>2</sub> R<sub>4</sub> response; and (<b>b</b>) ENS160 CH<sub>4</sub> R<sub>4</sub> response.</p> "> Figure 9
<p>Lineal regression on CO<sub>2</sub> response.</p> "> Figure 10
<p>Lineal regression on CH<sub>4</sub> response.</p> "> Figure 11
<p>PCA analyses when ethylbenzene, toluene, and xylene are measured.</p> "> Figure 12
<p>Load plots.</p> ">
Abstract
:1. Introduction
2. Materials and Methods
2.1. Gas Samples
2.2. Description of the Smartwatch
2.3. Measurement Setup
2.3.1. Gas Bottle Measurement Setup
2.3.2. Permeation Tube Measurement Setup
2.4. Limit of Detection Measurements
2.5. Discrimination Capabilities Measurements
2.6. Data Analysis
3. Results and Discussion
3.1. Limit of Detection Measurements
3.2. Discrimination Capabilities Measurements
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Chemical Agent | ELV-DE (ppm) | ELV-SE (ppm) |
---|---|---|
Toluene | 50 | 100 |
Xylene | 50 | 100 |
Ethylbenzene | 100 | 200 |
Carbon dioxide | 5000 | - |
Methane | 1000 | - |
AQI Value | Color | Hygienic Rating | Exposure Limit |
---|---|---|---|
5 | Red | Situation not acceptable | hours |
4 | Orange | Major objections | <1 month |
3 | Yellow | Some objections | <12 months |
2 | Green | No relevant objections | No limit |
1 | Blue | No objections | No limit |
Sensor | Manufacturer | Dimensions (mm3) | Signals | |
---|---|---|---|---|
BME688 | Bosch | 3.0 × 3.0 × 0.9 | Temperature (°C), relative humidity (%), pressure (mmHg), gas resistance (Ω) | |
SGP40 | Sensirion | 2.44 × 2.44 × 0.85 | Gas resistance (Ω) | |
ENS160 | ScioSense | 3.0 × 3.0 × 0.9 | Gas resistances (Ω), TVOCs (ppm), eCO2 (ppm), AQI |
Gas | Concentration (ppm) | Temperature (°C) |
---|---|---|
Toluene | 6 | 61 |
Xylene | 8 | 81 |
Ethylbenzene | 10 | 95 |
Sensor | Variables |
---|---|
ENS160 | Resistance (Var3, Var4, Var5), AQI (Var6), TVOC (Var7), eCO2 (Var9) |
SGP40 | Resistance (Var8) |
BME688 | Temperature (Var1), Relative Humidity (Var2), Resistance (Var10) |
Sensor | Equation | R2 | LOD (ppm) |
---|---|---|---|
R4 ENS160 | R = 0.0051103C + 0.1279 | 0.941 | 576.96 |
SGP40 | R = 0.00031215C − 0.0098129 | 0.991 | 94.38 |
BME688 | R = 0.0076506C − 0.74995 | 0.979 | 93.59 |
R1 ENS160 | R = 0.00011446C − 0.01644 | 0.976 | 358.2911 |
R3 ENS160 | R = 0.0001677C − 0.0096597 | 0.985 | 571.043 |
Sensor | Equation | R2 | LOD (ppm) |
---|---|---|---|
R4 ENS160 | R = 0.035108 − 0.035317 | 0.982 | 101.74 |
SGP40 | R = 0.0006708C + 0.00016605 | 0.974 | 52.0404 |
BME688 | R = 0.024595C + 1.1585 | 0.94 | 44.67 |
R1 ENS160 | R = 0.00019115C − 0.0098562 | 0.961 | 295.80 |
R3 ENS160 | R = 0.00043565C − 0.025474 | 0.959 | 222.55 |
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González, V.; Godoy, J.; Arroyo, P.; Meléndez, F.; Díaz, F.; López, Á.; Suárez, J.I.; Lozano, J. Development of a Smartwatch with Gas and Environmental Sensors for Air Quality Monitoring. Sensors 2024, 24, 3808. https://doi.org/10.3390/s24123808
González V, Godoy J, Arroyo P, Meléndez F, Díaz F, López Á, Suárez JI, Lozano J. Development of a Smartwatch with Gas and Environmental Sensors for Air Quality Monitoring. Sensors. 2024; 24(12):3808. https://doi.org/10.3390/s24123808
Chicago/Turabian StyleGonzález, Víctor, Javier Godoy, Patricia Arroyo, Félix Meléndez, Fernando Díaz, Ángel López, José Ignacio Suárez, and Jesús Lozano. 2024. "Development of a Smartwatch with Gas and Environmental Sensors for Air Quality Monitoring" Sensors 24, no. 12: 3808. https://doi.org/10.3390/s24123808