Evaluating ambient conditions for solar chargers with the help of sensors on smartphones

Schuss, Christian; Huikari, Jaakko; Leikanger, Tore; Eichberger, Bernd; Rahkonen, Timo

doi:10.1109/i2mtc.2015.7151248

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…In this work, the decision was made to obtain measurement results with the help of portable light spectrum meters. Alternatively, the light intensity could also be obtained with ambient light sensors (ALS) within smartphones or interfaced with smartphones for example through near field communication (NFC) [8]- [10]. Generally speaking, it can be challenging for humans to determine the exact light intensity.…”

Section: A Purpose Of Measurementsmentioning

confidence: 99%

Classroom Quality: On the Amount of Ambient Light in Today's Classroom - A Field Study

Schuss

Fabritius

2021

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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In this paper, we investigate the given ambient lighting conditions in today's schools. On the example of Oulu University Teacher Training School, the classroom quality in terms of the available amount of ambient lighting is analysed. In particular, attention is paid to the available illuminance of the pupils' desks. Commonly, light is produced artificially by light sources installed on the classroom's ceiling and obtained from the outside through windows. However, due to the use of digital blackboards, window blinds are often closed and lights are often switched off, thereby, reducing the available light in the classroom significantly. Furthermore, our results reveal that each pupil's desk receives a different light intensity. It is worth noting that low levels of ambient lighting can result into a degradation of learning performances and, therefore, requiring pupils more time solve different types of activities assigned by the teacher.

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Section: A Purpose Of Measurementsmentioning

confidence: 99%

Classroom Quality: On the Amount of Ambient Light in Today's Classroom - A Field Study

Schuss

Fabritius

2021

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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“…In previous studies, we have analysed the performance of ambient light sensors (ALSs) in smartphones [9]- [11] in addition to presenting the opportunity to enable external sensors for smartphones [4], [12]. The focus lied on sensors which are not available on smartphones on the one hand [4] and the calibration of existing sensors in smartphones on the other [12].…”

Section: A Research Backgroundmentioning

confidence: 99%

Efficient external sensors for smartphones through near field communication (NFC)

Schuss

Leikanger

Häkkinen

2018

2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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This paper evaluates the opportunity to utilise external sensors through near field communication (NFC) for smartphones, both, in terms of energy consumption from the smartphones' battery and time consumption of the smartphones' user. Our developed sensor card enables external sensors to obtain information, for example, on the current temperature level, humidity level, UV level, and amount of ambient light. We demonstrate that our approach requires significantly less energy and time compared to alternatives which users of smartphones have. Furthermore, we analyse the impact of heat sources present in smartphones on the readings of temperature and humidity level sensors. We propose to externalise sensors in order to minimise the negative impact of temperature on sensors readings and, thereby, improving the accuracy of the measurements and the acquired sensor data.

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“…However, the problem with the internal light sensor is the large uncertainty in the ambient light measurements [2]. The differences in the measured ambient light intensities (E v ) are not only due to different smart phone models, also large differences between the same smart phone models have been shown [3].…”

Section: Introductionmentioning

confidence: 99%

Calibration of smartphone light sensors with a near field communication enabled reference

2016

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Abstract-This paper describes a technique for calibrating the internal ambient light sensor (ALS) in smart phones. The calibration process depends on Near-Field Communication (NFC). The system consists of an NFC core implemented in an Field-Programmable Gate-Array (FPGA) development platform featuring the NFC analog front end circuit. In the proposed system, the smart phone interacts directly with a reference ALS through the NFC device The direct communication is possible with the help of a custom NFC command that controls an InterIntegrated Circuit (I2C) master core in the FPGA. After the calibration process of the ALS in a smart phone is completed, the accuracy of the measurement is greatly improved. This is helpful to obtain precise information on the light intensity in indoor surroundings.

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Evaluating ambient conditions for solar chargers with the help of sensors on smartphones

Cited by 3 publications

References 13 publications

Classroom Quality: On the Amount of Ambient Light in Today's Classroom - A Field Study

Classroom Quality: On the Amount of Ambient Light in Today's Classroom - A Field Study

Efficient external sensors for smartphones through near field communication (NFC)

Calibration of smartphone light sensors with a near field communication enabled reference

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