Abstract
In this paper, we propose an implementation of machine-type communications by combining a novel hardware-accelerated serial interface and a conventional Internet of things (IoT) gateway. Even all home appliances with an infrared (IR) remote controller can be operated through the Internet. In the future, application paradigms will transfer from human-type communications to machine-type communications to provide services such as health care and smart-home control systems. Therefore, commercial IoT gateways are required for intranet-Internet bridging of various wireless access services. Home appliances that are currently used or will foreseeably be used in the future lack network capabilities but can be controlled by an IR remote controller. Accordingly, to leverage existing IR control capabilities, we implemented a smart-home control system, which enables an IR signal to be remotely controlled to emit through the Internet. The implemented system provides a hardware-accelerated serial interface to sample IR signals—including extremely high-frequency signals—and includes a hardware-based data compression mechanism able to reduce the size of oversampled data and save flash memory space. A more intelligent control style can thus be realized by leveraging existing home appliances for the smart-homes of the future.
Highlights
We introduce characteristics, protocols, relevant studies, and application problems related to IR signals. e descriptions follow on from those in the work of Tsai et al [15].2.1
E leader code contains a high-level signal 9 ms in length and a low-level signal 4.5 ms in length (Figure 1). e second 8 bit custom code is bit inverse to the first 8 bit custom code for the purpose of data integrity checks used by the signal receiver; this applies to data code pairs
The IoT home gateway can be set to operate in the study mode to record the specified IR signal emitted by pressing an IR remote controller button for a home appliance. e user can use a smartphone to choose a prerecorded signal. e control message is subsequently transmitted to the IoT home gateway through the wireless network
Summary
We introduce characteristics, protocols, relevant studies, and application problems related to IR signals. e descriptions follow on from those in the work of Tsai et al [15]. For the application of IR signals for remote appliance control, the carrier frequency used could range from 20 to 80 kHz. the carrier frequency applied by the NEC IR protocol is 38 kHz (i.e., cycle time 26.3 μs) and the duty cycle factor is one of three. (1) Signal carriers with different frequencies: most IR remote controllers of home appliances apply the carrier frequency of 38 kHz as defined by NEC.
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