I came up with the following simple schematic in order to amplify the EMG signal and feed it to an arduino:


simulate this circuit – Schematic created using CircuitLab

The problem is that I monitor analog pin 6 of the arduino and it's always 0.

  • \$\begingroup\$ Is this a serious question or a thanksgiving prank? \$\endgroup\$ – John D Nov 25 '16 at 0:55
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    \$\begingroup\$ Is Arduino input A6 connected directly to ground (as shown in the schematic)? That's why it measures as 0. \$\endgroup\$ – MarkU Nov 25 '16 at 1:08
  • \$\begingroup\$ @MarkU Sorry that was a mistake (and one more), just edited it. \$\endgroup\$ – DimChtz Nov 25 '16 at 1:15
  • \$\begingroup\$ @JohnD Yes it is a serious question and yes I know the schematic is probably bad. I am just trying to make it work. \$\endgroup\$ – DimChtz Nov 25 '16 at 1:17
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    \$\begingroup\$ Your schematic shows no DC path for the LM358 negative input. Also there are safety issues when connecting electronics to people. That is why there are strict regulations on medical equipment and one reason such equipment is expensive. \$\endgroup\$ – Barry Nov 25 '16 at 1:23

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