Journal
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Volume 69, Issue 9, Pages 5966-5968Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2020.3009340
Keywords
Light emitting diodes; Sun; Microcontrollers; Optical filters; Photodiodes; MOS devices; Resistors; Light-emitting diode (LED); low-power mode (LPM); microcontroller (MCU); optical wake-up circuit; photodiode
Funding
- Secretariat of University and Research of the Ministry of Business and Knowledge of the Government of Catalonia
- Spanish State Research Agency (AEI)
- European Regional Development Fund [TEC2016-76991-P]
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This article proposes, analyzes, and tests a wake-up circuit for a microcontroller (MCU) that uses a light-emitting diode (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. This article includes a theoretical analysis and experimental results that validate the proposed circuit.
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