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The noise pollution is still a troubling problem for us, especial in hospital, library, baby-care center, etc. Although many decibel-meters are applied to those environment, which indeed must be kept quit, but the decibel-meters can only detect the noise pollution limited to nearest area around the device. We will face the incorrect measuring data from the decibel-meters in bigger space like library...
This study was based on the Internet of Things (IoT) architecture to propose an ultrasonic Morse code electronic lock for a home access control and safety system. Audio components of a smartphone were employed for ultrasonic Morse coding. Once the password of the receiver is confirmed to be correct through a microphone and micro-controller decoding, the details about the unlocking personnel and unlocking...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.