How to measure sweat using galvanic skin response?

Projects General Guidance
1

How would i measure sweat using galvanic skin response, i got some sample code online but all it does is measure the movements that i make.

2

Interesting problem. Looks like your sample code must be more than just measuring the skin DC resistance. What is your circuit and what is you code?

3

Does this involve two different metals, and if so: which metals?

4

"Electrodermal activity (EDA)" - theory of physiochemical response in the nervous system to an emotional event. "Sweatin' bullets" without physical exercise.

5

It's simply the electrical resistance between skin-placed electrodes. You can experiment with it using only a DMM.

6

all it does is measure the movements that i make

The gizmo is probably measuring a lot of things at once. The trick is to subtract off the parts of the signal that aren't interesting and focus on the part that remains.

If you were to provide details about your setup (links to parts, code, wiring), what you did to test it and examples of the signals you observed, you might get some useful responses.

7

You need to make your Arduino circuit perform just like the Ohmmeter circuit on your digital volt/Ohmeter. No AC allowed. Add some capacitors to the test leads to bypass any AC voltages.

8 
int sensor = A0;
int sensorValue = 0;

void setup() {
  Serial.begin(9600);

}

void loop() {
  sensorValue = analogRead(sensor);
  sensorValue = map(sensorValue, 0, 1023, 0, 100);
  Serial.println(sensorValue);
  delay(100);

 
}
9

And your circuit schematic is?

10

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