I want to design a wearable gadget for elderly to detect falling. This gadget should work by energy harvesting. Now I want to find the best effitient way of power consumtion to send data to a station for emergency alert. Does anyone have any experience to help me choose the best way to communicate? I myself think about ultra-low power bluetooth module but I don't know the best ultra-low power bloutooth module. Can anyone help me? Thanks in advance.

  • \$\begingroup\$ With long term battery powered or energy harvesting the most important thing to consider is the constant energy consumption. In your case, how to reliably detect a fall. The RF TX part is easy since it's such a low duty cycle (one time). \$\endgroup\$ – Aaron Mar 12 '19 at 21:03
  • \$\begingroup\$ How much power do you think you can harvest? How much energy will you have stored when it is time to make a transmission? You are asking only about the best way to communicate, so I assume you have worked out these other critical details. \$\endgroup\$ – Elliot Alderson Mar 12 '19 at 23:02
  • \$\begingroup\$ @ElliotAlderson Thanks for your reply. I haven't test anything yet, But according to an article, I think I can harvest bout hundreds of micro-Watts power and 1.1uJ energy per day from the kinetic energy of user. I don't know how to relate these numbers to different part of the device such as the sensor, microcontroller, and other parts. Would you please explain it for me? \$\endgroup\$ – nrt Mar 15 '19 at 13:20

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