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I currently have a project that has integrated sensors to monitor human health and related biomarkers, my domain is human-performance so giving athletes the tools to get better at their respective game.

I have recently begun trying to gather information regarding bioimpedance in order to implement this in my embedded project. For a prototype I am using the STM32 series ( blue pill chip ) to package a sensorframe of values ( o2, pulse, gyro & acc data, temperature ) now I really want to add bioimpedance to this device - heres what I think I know so far anyways

  • We need to emit an electric current over a multi-channel ( I want to calculate bone density, muscle mass, fat mass)

  • We need an emitter and a receiver

  • there needs to be two connected components by a wire that connect the two devices that complete the circuit

My questions are this, what frequency do I need to use to calculate my targets?

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  • \$\begingroup\$ shock: a sudden upsetting or surprising event or experience. Not sure you'll have many takers on your device...other than a few masochists. \$\endgroup\$ – Aaron Jul 14 at 19:40
  • \$\begingroup\$ Welcome to EE-SE. It may be hard to get some traction here with that question. What is your background and experience with electronics? \$\endgroup\$ – P2000 Jul 15 at 5:07
  • \$\begingroup\$ my background is mostly software development with some exposure to hardware, but I have built embedded projects using various languages and understand the various communication interfaces, my weak area is EE and designing circuits at this point which is why I reached out here; although I understand high-level bioimpedance I do not know how to build the circuit with a wholistic understanding. @P2000 \$\endgroup\$ – travis haycock Jul 15 at 15:20
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Apparently, they use at least 2 frequencies with a current source and measure the voltage as impedance. The current is only 1~10uA and f1=10k~100kHz f2=1~10MHz.

You can multiplex the signals with analog Mux.

https://academic.oup.com/ajcn/article-pdf/64/3/388S/24035357/388s.pdf

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