Seeed Grove User manual

Grove - Voltage Divider

Version：1.0

Release date：9/20/2015

Wiki: http://www.seeedstudio.com/wiki/Grove_-_Voltage_Divider

Bazaar: http://www.seeedstudio.com/depot/Grove-Voltage-Divider-p-1472.html

Document Revision History

Revision

Date

Author

Description

1.0

Sep 21, 2015

Victor.He

Create file

Contents

Document Revision History···································································································2

1. Introduction ··················································································································· 2

2. Features··························································································································3

3. Specifications ·················································································································4

4. Usage······························································································································5

5. Resource·························································································································7

6. Support···························································································································8

Disclaimer

For physical injuries and possessions loss caused by those reasons which are not related to product quality,

such as operating without following manual guide, natural disasters or force majeure, we take no

responsibility for that.

Under the supervision of Seeed Technology Inc., this manual has been compiled and published which

covered the latest product description and specification. The content of this manual is subject to change

without notice.

The design of this product (including software) and its accessories is under tutelage of laws. Any action to

violate relevant right of our product will be penalized through law. Please consciously observe relevant local

laws in the use of this product.

1. Introduction

The Grove –Voltage Divider provides an interface for measuring external voltage, eliminating the need to

connect a resistance to input interface. Besides, the voltage gain can select by dial switch. They are easy to

use.

2. Features

Extern Voltage Interface and Grove Interface

Easy to use

Can adjust the gain

3. Specifications

Item

Min

Typical

Max

Unit

Working Voltage

4.7

5.0

5.3

VDC

Measurement Accuracy

<=1

Extern Voltage Range

select 3

0.3

12.9

Select 10

1.0

Dimension

24X20

4. Usage

When measuring the external voltage, connect the external voltage to J1 and then connect the on-board

Grove connector to analog port of Arduino/Seeeduino:

Connect the module to A0 port of Grove - Base Shield with a universal Grove Cable.

Connect Grove - Base Shield to Arduino/Seeeduino.

In order to test the precision of this module, I tested some voltage inputs and get the following data:

As you can see, when the inputs were in the measuring range, the voltage divider has a high

accuracy(<1%, that i marked an "OK"). But as the inputs were not in the range, the accuracy gets

low(i marked a "NO") Please see Specification about the specific measurement range.

And When voltage divider output voltage is higher than VCC (The Grove Operating Voltage and

reference of analog read), an indicator will light up to show you the error.

Using the serial monitor of Arduino, you can measure the input voltage value. Demo code as

show below:

void setup(){

Serial.begin(9600);

}

void loop(){

long sensorValue=analogRead(A0);

long sum=0;

for(int i=0;i<1000;i++)

{

sum=sensorValue+sum;

sensorValue=analogRead(A0);

delay(2);

}

sum=sum/1000;

Serial.print("if you set the Gain to 10,the input voltage:");

Serial.println(10*sum*4980/1023.00);

Serial.print("if you set the Gain to 3,the input voltage:");

Serial.println(3*sum*4980/1023.00);

delay(1000);

}

5. Resource

Grove - Voltage Divider Eagle File

LMV358ID Datasheet

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