Decoding methods in LED-to-smartphone bidirectional communication for the IoT

Duque, Alexis; Stanica, Razvan; Rivano, Hervé; Desportes, Adrien

doi:10.23919/glc.2018.8319118

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…4 shows the resulting waveforms. Pulses are not perfectly periodic but they slightly vary from pulse to pulse; this is a limitation of the Android Operating System since it is not possible to keep accurate track on short times [13]. The waveforms are still similar to those in Fig.…”

Section: Smartphone Testmentioning

confidence: 79%

LED-Based Wake-Up Circuit for Microcontrollers

Ripoll-Vercellone¹,

Reverter

Gasulla

2020

IEEE Trans. Instrum. Meas.

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This paper proposes, analyzes, and tests a wake-up circuit for a microcontroller (MCU) that uses a LED, operating as a photodetector, illuminated by a smartphone flashlight. The wake-up circuit consists of a high-pass filter and a voltage level translator that interfaces the LED, with a suitable resistor in parallel, to the MCU. When illuminated by a switching flashlight, the LED generates a square voltage that is conveniently converted in logic levels at the output of the wake-up circuit. A firmware embedded into the MCU additionally checks that a predetermined sequence of logic pulses at a given rate is accomplished to activate the MCU. The paper includes a theoretical analysis and experimental results that validate the proposed circuit.

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Section: Smartphone Testmentioning

confidence: 79%

LED-Based Wake-Up Circuit for Microcontrollers

Ripoll-Vercellone¹,

Reverter

Gasulla

2020

IEEE Trans. Instrum. Meas.

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“…The studies [4]- [6] are focused on applications where a transmitter is represented as an LED light bulb, which illuminates the whole room and has a light distribution close to uniform. Duque et al in several of his studies [7], [8] conduct the research on LED-tocamera communication, where an LED is a part of an IoT device or a sensor node and its brightness is concentrated only in a small spot of the image. When the preview mode of the Android camera application is enabled, the resulting images are stored in the buffer.…”

Section: Software Implementation and Related Workmentioning

confidence: 99%

“…For this purpose, we have to define the threshold level. In [8] and [6] this procedure is implemented by computing the average values of the one-dimensional array obtained in step 2. In [5] this value is set empirically and in [4] it is equal to 0 as a result of polynomial regression.…”

Section: Software Implementation and Related Workmentioning

confidence: 99%

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Optical autonomous sensor module communicating with a smartphone using its camera

Dudko

Pflieger

Overmeyer

2019

Smart Photonic and Optoelectronic Integrated Circuits XXI

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Wireless optical communication is a viable alternative to conventional RF technology. Our novel design combines optical communication and energy harvesting in one device with a size of 30 x 10 x 5 mm using the latest innovations in lowpower electronics and solar cell technology. In our study, we implement visible light communication between a sensor module and a smartphone. The proposed system design and a communication protocol are specifically developed for environments with illumination levels of 100 -500 lux, like industrial halls. The sensor integrated into the module can vary according to application requirements. As an example, in our work, we use a temperature and pressure sensor and an accelerometer. A bright flash from a smartphones build-in LED activates the module. The module takes measurements and sends the result in form of an optical data signal, which is then received by the smartphone camera. This technique is able to provide reliable communication despite low-power restrictions of energy harvesting. By using a smartphone this approach offers more convenience to a user and enables flexible deployment of the modules in industrial machinery.

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Power Management in Autonomous Optical Sensor Nodes

Dudko

Overmeyer

2019

Cyber-Physical Systems and Control

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Decoding methods in LED-to-smartphone bidirectional communication for the IoT

Cited by 8 publications

References 13 publications

LED-Based Wake-Up Circuit for Microcontrollers

LED-Based Wake-Up Circuit for Microcontrollers

Optical autonomous sensor module communicating with a smartphone using its camera

Power Management in Autonomous Optical Sensor Nodes

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