Grove - GSR Sensor

Introduction

3.3V 5.0V Analog

GSR stands for galvanic skin response, is a method of measuring the electrical conductance of the skin. Strong emotion can cause stimulus to your sympathetic nervous system, resulting more sweat being secreted by the sweat glands. Grove - GSR allows you to spot such strong emotions by simple attaching two electrodes to two fingers on one hand. It is an interesting to create emotion related projects like sleep quality monitor.

Warning

Grove-GSR Sensor measures the resistance of the people, NOT Conductivity!

Version

Product Version	Changes	Released Date
Grove - GSR_Sensor V1.0	Initial	June 19, 2013
Grove - GSR_Sensor V1.2	Add C3 100nf between M324PW-TSSOP14 and GND	July 31, 2014

Specification

Parameter	Value/Range
Operating voltage	3.3V/5V
Sensitivity	Adjustable via a potentiometer
Input Signal	Resistance, NOT Conductivity
Output Signal	Voltage, analog reading
Finger contact material	Nickel

Tip

More details about Grove modules please refer to Grove System

Platforms Supported

Getting Started

Hardware

Step 1. We need to prepare the below stuffs:

Seeeduino V4.2	Base Shield	Grove - GSR

Get ONE Now	Get ONE Now	Get ONE Now

Step 2. Connect the Grove-GSR to A0 on Base Shield.
Step 3. Plug the base Shield into Seeeduino-V4.2.
Step 4. Connect Seeeduino-V4.2 to PC by using a USB cable.

Note

If we don’t have a Base Shield, don’t worry, the sensor can be connected to your Arduino directly. Please follow below tables to connect with Arduino.

Seeeduino	Grove-GSR Sensor
GND	Black
5V	Red
NC	White
A0	Yellow

Software

Step 1. Copy the code into Arduino IDE and upload.

const int GSR=A0;
int sensorValue=0;
int gsr_average=0;

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

void loop(){
  long sum=0;
  for(int i=0;i<10;i++)           //Average the 10 measurements to remove the glitch
      {
      sensorValue=analogRead(GSR);
      sum += sensorValue;
      delay(5);
      }
   gsr_average = sum/10;
   Serial.println(gsr_average);
}

Step 2. Wear the GSR sensor
Step 3. Click the Tools-> Serial Plotter from Arduino IDE
Step 4. We will see the below graph. Please deep breath and see the trends.

Human Resistance = ((1024+2Serial_Port_Reading)10000)/(512-Serial_Port_Reading), unit is ohm, Serial_Port_Reading is the value display on Serial Port(between 0~1023)

FAQ

Please click here to see all Grove - GSR sensor FAQs.

Tech Support

Please do not hesitate to contact techsupport@seeed.cc if you require further information.

Resources

Arduino	Wio	BeagleBone	Raspberry Pi	LinkIt ONE

Caution

The platforms mentioned above as supported is/are an indication of the module's hardware or theoritical compatibility. We only provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library / demo code for all possible MCU platforms. Hence, users have to write their own software library.

Help us make it better

Welcome to the new documentation system of Seeed Studio. We have made a lot of progress comparing to the old wiki system and will continue to improve it to make it more user friendly and helpful. The improvement can't be done without your kindly feedback. If you have any suggestions or findings, you are most welcome to submit the amended version as our contributor via Github or give us suggestions in the survey below, it would be more appreciated if you could leave your email so that we can reply to you. Happy Hacking!