Abstract
Automated home applications are to ease the use of technology and devices around the house. Most of the electronic devices, like shutters or entertainment products (Hifi, TV and even WiFi), are constantly in a standby mode, where they consume a considerable amount of energy. The standby mode is necessary to react to commands triggered by the user, but the time the device spends in a standby mode is considered long. In our work, we present a receiver that is attached to home appliances that allows the devices to be activated while they are completely turned off in order to reduce the energy consumed in the standby mode. The receiver contains a low power wake-up module that reacts to an addressable acoustic 20-kHz sound signal that controls home devices that are connected to it. The acoustic wake-up signal can be sent by any kind of speaker that is available in commercial smartphones. The smartphones will operate as transmitters to the signals. Our wake-up receiver consists of two parts: a low power passive circuit connected to a wake-up chip microcontroller and an active micro-electromechanical system (MEMS) microphone that receives the acoustic signal. A duty cycle is required to reduce the power consumption of the receiver, because the signal reception occurs when the microphone is active. The current consumption was measured to be 15 μA in sleep mode and 140 μA in active mode. An average wake-up range of 10 m using a smartphone as a sender was achieved.
Highlights
Smart homes are one of the new trends for integrating technology in people’s daily life.In general, many household devices employ electronics that are in standby mode most of the time
We optimized the active phase of the duty cycle so that the wake-up signal can be transmitted within a period of 60 ms
We presented a 16-bit addressable acoustic wake-up receiver, which can be used to operate home devices by powering them on and off from the main power
Summary
Smart homes are one of the new trends for integrating technology in people’s daily life. We consider an unconventional method to wake up the receiver that is attached to a device in order to power it on or off This method does not need any infrastructure, like an access point similar to WiFi, and it is based on the acoustic wave signals generated by the smartphone, where these acoustic waves form the wake-up signal are required to wake-up the electronic device. A thorough implementation of an ultrasound wake-up receiver consuming 4 μW of current and working at 40 kHz is presented in [11] It uses off-the-shelf ultrasonic transducers, where a wake-up distance up to 8.6 m is achieved. The aim of integrating wake-up receivers in sensor nodes is to reduce the power consumption by operating on low power modes. In our previous work [17], we considered an approach of acoustic wake-up receivers without considering any filter for noise cancellation and signal amplification, which resulted in a limited functionality, where a wake-up distance up to 5 m is achieved
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