To aid rescue operations for victims trapped under rubble in the aftermath of an earthquake, a wristband will be used, which upon activation, will measure the pulse of the victim and transmit it through a set of drones hovering over the affected areas to a central database. Based on this information, rescue teams will be directed to the worst hit areas faster and save more lives.

The steps involved are:

1. Activation:
The wristband requires activation when a victim gets trapped under rubble. Drones will do this. Consider a single drone hovering over an area affected by an earthquake. It will emit a 13-bit ID sequence, which will be converted to an ultrasonic frequency using a Digital to Analog ...

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