Description:

There are several graphs which are created in excel using GSR data.You can open the File:GSR sensor data.xls to see the detail data.

Copy and paste the code below to a new Arduino sketch and upload it to Arduino.

Wear the finger sheath and relaxNow open serial monitorwe can see:

Then take a deep breath. The buzzer should buzz now. And an obvious change in the output value should be observed.

The below is a graphs which is created in Excel using the data above. X axis represents time. and Y axis GSR data.

Features:

• Input Voltage: 5V/3.3V
• Sensitivity adjustable via a potentiometer
• External measuring finger cots

Mikroelectron Code:

const int BUZZER = 3;
const int GSR = A2;
int threshold = 0;
int sensorValue;
void setup()
{ long sum = 0;
  Serial.begin(9600);
  pinMode(BUZZEROUTPUT);
  digitalWrite(BUZZERLOW);
  delay(1000);
  for (int i = 0; i < 500; i++)
  {
    sensorValue = analogRead(GSR);
    sum += sensorValue;
    delay(5);
  }
  threshold = sum / 500;
  Serial.print("threshold =");
  Serial.println(threshold);
}
void loop()
{ int temp;
  sensorValue = analogRead(GSR);
  Serial.print("sensorValue=");
  Serial.println(sensorValue);
  temp = threshold - sensorValue;
  if (abs(temp) > 50)
  {
    sensorValue = analogRead(GSR);
    temp = threshold - sensorValue;
    if (abs(temp) > 50)
    {
      digitalWrite(BUZZERHIGH);
      Serial.println("YES!");
      delay(3000);
      digitalWrite(BUZZERLOW);
      delay(1000);
    }
  }
}