Seeed studio Grove-I2C ADC Bedienungsanleitung

Grove - I2C ADC

Version：1.0

Release date：9/20/2015

Wiki: http://www.seeedstudio.com/depot/Grove-I2C-ADC-p-1580.html

Bazaar: http://www.seeedstudio.com/wiki/Grove_-_I2C_ADC

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. Interface functions·········································································································5

5. Usage······························································································································6

5.1 With Arduino····················································································································· 6

5.2 With Beaglebone Green···································································································· 9

6. Reference ·····················································································································11

6.1 I2C Address Setting ········································································································· 11

6.2 How much does the I2C ADC increase the accuracy?····················································· 12

7. Resource·······················································································································16

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

Grove - I2C ADC is a 12-bit precision ADC module based on ADC121C021. It helps you increase the

accuracy of value collected from analog sensor by providing a constant reference voltage. Because its

address is changeable, you can use up to 9 I2C ADC at the same time at most. At the other hand, this

module provides auto sleep function which lowers the power consumption considerably.

2. Features

Low power consumption

High precision

Automatic power-down mode

Address changeable

3. Specifications

Item

Typical

Unit

Working Voltage

5.0

VDC

Resolution

Bit

Sample Rate

188.9

ksps

Dimension

40X20

4. Interface functions

J1: used to connect Arduino IIC Interface as Grove - I2C ADC output interface.

J2: used to connect analog sensor as Grove - I2C ADC input interface.

U1: ADC121C021 IC, 12-Bit Analog-to-Digital Converter

The black line area is used to set the IIC address. ADDR0 and ADDR1 are shipped connected to L. You can

change them to "H" or floating by a little modification on the board (floating is neither connecting "H" nor

connecting "L"). Find details in the Reference.

5. Usage

5.1 With Arduino

Grove - I2C ADC has two interfaces: input socket (J2) and output socket (J1). Connect an analog sensor to

its input socket and connect the I2C ADC to Arduino or Seeeduino also via Grove cables.

Take Grove - Gas Sensor as an example, and now we learn how to read sensor data using Grove - I2C ADC.

The hardware installation should be like this:

Now you can read the gas sensor value using the code below.

#include <Wire.h>

#include <Streaming.h>

#define ADDR_ADC121 0x55

#define V_REF 3.00

#define REG_ADDR_RESULT 0x00

#define REG_ADDR_ALERT 0x01

#define REG_ADDR_CONFIG 0x02

#define REG_ADDR_LIMITL 0x03

#define REG_ADDR_LIMITH 0x04

#define REG_ADDR_HYST 0x05

#define REG_ADDR_CONVL 0x06

#define REG_ADDR_CONVH 0x07

unsigned int getData;

float analogVal=0;// convert

void init_adc()

{

Wire.beginTransmission(ADDR_ADC121); // transmit to device

Wire.write(REG_ADDR_CONFIG); // Configuration Register

Wire.write(0x20);

Wire.endTransmission();

}

void read_adc() //unsigned int *data

{

Wire.beginTransmission(ADDR_ADC121); // transmit to device

Wire.write(REG_ADDR_RESULT); // get result

Wire.endTransmission();

Wire.requestFrom(ADDR_ADC121,2); // request 2byte from

device

delay(1);

if(Wire.available()<=2)

{

getData =(Wire.read()&0x0f)<<8;

getData |= Wire.read();

}

Serial.print("getData:");

Serial.println(getData);

delay(5);

Serial.print("The analog value is:");

Serial.print(getData*V_REF*2/4096);

Serial.println("V");

}

void setup()

{

Serial.begin(9600);

Wire.begin();

init_adc();

}

void loop()

{read_adc();//adcRead);

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