Grove - Voltage Divider

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.

Feature

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• Extern Voltage Interface and Grove Interface
• Easy to use
• Can adjust the gain

Specification

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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
Extern Voltage Range (Select 10)	1.0	/	43	V
Dimension	/	24X20	/	mm

Usage

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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);
}

Resource

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• Grove - Voltage Divider Eagle File
• LMV358ID Datasheet

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