Seeed Grove User manual

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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

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Document Revision History
Revision
Date
Author
Description
1.0
Sep 21, 2015
Victor.He
Create file

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Contents
Document Revision History···································································································2
1. Introduction ··················································································································· 2
2. Features··························································································································3
3. Specifications ·················································································································4
4. Usage······························································································································5
5. Resource·························································································································7
6. Support···························································································································8

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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.
Copyright
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.

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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.

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2. Features
Extern Voltage Interface and Grove Interface
Easy to use
Can adjust the gain

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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
V
Select 10
1.0
/
43
Dimension
24X20
mm

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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);
}

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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);
}

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5. Resource
Grove - Voltage Divider Eagle File
LMV358ID Datasheet

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6. Support
If you have questions or other better design ideas, you can go to our forum or wish to discuss.

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