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A Low-Cost Luxometer Benchmark for Solar Illuminance Measurement System Based on the Internet of Things
Omar Guillán Lorenzo1, Andrés Suárez-García2, David González Peña1
1Research Group Solar and Wind Feasibility Technologies (SWIFT), Electromechanical Engineering Department, University of Burgos, Avda. Cantabria s/n, 09006 Burgos, Spain.
Sensors (Basel, Switzerland)
|October 14, 2022
Summary
Low-cost illuminance sensors show good precision but can have up to 60% bias in direct sunlight. Mathematical correction may improve accuracy for home automation applications.
Area of Science:
- Environmental Science
- Sensor Technology
- Home Automation
Background:
- Natural illumination is crucial for energy savings and visual health in smart homes.
- Accurate illuminance measurement is key for effective home automation.
- Low-cost sensors are desirable but require validation against professional standards.
Purpose of the Study:
- To compare the performance of low-cost commercial illuminance sensors against a professional-grade sensor.
- To evaluate sensor accuracy and precision under outdoor summer conditions.
- To assess the feasibility of using low-cost sensors in home automation systems.
Main Methods:
- Deployed four illuminance sensors (VEML 7700, TSL2591, OPT3001, ML-020S-O) outdoors.
- Utilized an Internet of Things (IoT) platform for data collection and processing.
- Recorded solar illuminance data every minute during summer months.
Main Results:
- Low-cost sensors exhibited precision but showed a bias dependent on solar height, reaching up to 60% in adverse conditions.
- The bias generally remained below 40% under most tested circumstances.
- The systematic deviation suggests potential for mathematical correction.
Conclusions:
- Low-cost illuminance sensors offer a precise yet potentially biased measurement solution for outdoor applications.
- Mathematical correction strategies could enhance the accuracy of these sensors.
- Further research incorporating more sensors and data is recommended for system improvement.
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