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Is it possible to use mobile phone as sensor for measuring conductivity of a medium? My aim is to avoid any external hardware. The two input channels can be used as 3.5mm microphone jack or USB.

Vinayak Kumar
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  • What type of conductivity? – Andy aka Mar 02 '15 at 11:22
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    If it's a fluid: 1. Start a timer on the phone. 2. Drop the phone into the fluid. 3. Use the length of time before the phone dies to calculate the conductivity. 4. Buy a new phone. – Majenko Mar 02 '15 at 11:23
  • conductivity of water for measurement of TDS (total dissolved solid). – Vinayak Kumar Mar 02 '15 at 11:23
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    Play some old classical music from your phone at a very high volume, if someone in a crowd stands up and begins swinging their arm wildly they might be a good Conductor..... – Nedd Mar 02 '15 at 11:30
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    @VinayakKumar: It may take quite a while until your phone totally dissolves in water... – PlasmaHH Mar 02 '15 at 11:50
  • By any external hardware i meant, boards like arduino, IOIO or other microcontroller. :) – Vinayak Kumar Mar 02 '15 at 12:03

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Use the headphone output and the microphone input together. Send a signal on the output and check on the input if the same signal appears.