Grove - Differential Amplifier v1.2

Introduction

3.3V 5.0V Digital

This Grove is designed for precise differential-input amplification. Input the differential signals of your sensor to this module through the male pins, then your Arduino will get a precisely amplified output from the Grove interface. The gain scale factor is selectable. You can get a 35 times or 1085 times amplification via a switch on the board.

Features

  • High amplifying precision
  • Selectable scale factor
  • Can be conveniently read by Arduino

Tip

More details about Grove modules please refer to Grove System

Applications

  • Data acquisition
  • Battery operated systems
  • Pressure and temperature bridge amplifiers
  • General purpose instrumentation

Specifications

Item Min Typical Max Unit
Operating Voltage 2.7 5.0 5.5 VDC
Input Voltage 0.1 \\ (Vcc-0.8)/Gain mV
Output Voltage 0 \\ Vcc-0.80 mV
Gain Select 35 / 35 / /
Select 1085 / 1085 /

Platforms Supported

Usage

1. Sensor Choosing

The amplifier can turn signals in mA scale up to A scale. Before using it, make sure the output range of your sensor is in mA scale. For example, Weight Sensor is one of them.

2. Connector Reforming

To pair the weight sensor up with the male pins on the amplifier, female connectors need to be soldered on its wires.

3. Hardware Hookup

Connect the weight sensor to the amplifier as the picture depicts below.

4. Measurement

Copy and paste the demo code below to Arduino IDE and upload it.

    void setup()
    {
      Serial.begin(9600);
      Serial.println("start");
    }

    void loop()
    {
      int i;
      int value;
      float V,Vo;
      float Sum=0;
      for(i=0;i<10;i++)
      {
        value=analogRead(4);
        V=value*5.00/1023;
        Sum+=V;
        delay(10);
      }
      Vo=Sum/10;
      Serial.print("Output score:");
      Serial.println(Vo);
      delay(1000);
    } 

You can view the amplified signals via serial monitor. For the value of the input signal, you need to use the multimeter to measure the voltage difference between VIN+ and VIN-.

Resources


ArduinoWioBeagleBoneRaspberry PiLinkIt 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

Thank you for choosing Seeed. A couple of months ago we initiated a project to improve our documentation system. What you are looking at now is the first edition of the new documentation system. Comparing to the old one, here is the progresses that we made:

  • Replaced the old documentation system with a new one that was developed from Mkdocs, a more widely used and cooler tool to develop documentation system.
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  • Reviewed and rewrote documents for hundreds of products for the system’s first edition, and will continue migrate documents from old wiki to the new one.

An easy-to-use instruction is as important as the product itself. We are expecting this new system will improve your experience when using Seeed’s products. However since this is the first edition, there are still many things need to improve, if you have any suggestions or findings, you are most welcome to submit the amended version as our contributor or give us suggestions in the survey below, Please don’t forget to leave your email address so that we can reply.

Happy hacking