Seeed Grove-Encoder User manual

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Grove - Encoder
Version：1.0
Release date：9/22/2015
Wiki: http://www.seeedstudio.com/wiki/Grove_-_Encoder
Bazaar: http://www.seeedstudio.com/depot/Grove-Encoder-p-1352.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. Resources ·······················································································································8
6. Support···························································································································9

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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
This module is an incremental rotary encoder. It encodes the rotation signal from the axis and output the
signal by electronic pulse. The Grove –Encoder is one of the Grove series and has a standard Grove interface.
When you need to add a rotary knob to your project, for example a volume knob for a speaker, a selection
panel or a digital input, this will be your first choice.

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2. Features
Incremental encoder
Grove Interface.
360 degree rotary

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3. Specifications
Item
Min
Typical
Max
Unit
Voltage
4.5
5
5.5
VDC
Current
10
20
30
mA
Dimension
20x 20
mm
Net Weight
12
Gram

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4. Usage
This Grove-Encoder is very easy to use with the Encoder Lib designed by seeedstudio. Simply connect this
module to the D2 connector of Base Shield and you can start using. The following is a introduction of how
to make a Circular LED bar (the idea came from seeedstudio wish）.
This Circular LED bar consists of an Encoder and a Grove-CircularLED module. Connect the two modules
to Base shield as the following picture:
In the project, the TimeOne Lib and Encoder Lib and CircularLED Library are needed. Download all the
librarys and install them to your Arduino IDE.
Restart the Arduino IDE and open the example by the
path :File->Examples->Encoder->EncodeCircuiBar.
#include <CircularLED.h>
#include <Encoder.h>
#include <TimerOne.h>
CircularLED circularLED;
unsigned int LED[24];
int index_LED;
void setup()
{
encoder.Timer_init();
}

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void loop()
{
if (encoder.rotate_flag ==1)
{
if (encoder.direct==1)
{
index_LED++;
if (index_LED>23)
index_LED=24;
SenttocircularBar(index_LED);
}
else
{
index_LED--;
if(index_LED<0)
index_LED=0;
SenttocircularBar(index_LED);
}
encoder.rotate_flag =0;
}
}
void SenttocircularBar(int index)
{
for (int i=0;i<24;i++)
{
if (i<index)
{
LED[i]=0xff;
}
else
LED[i]=0;
}
circularLED.CircularLEDWrite(LED);
}
Upload it to your Arduino/Seeeduino, please refer to here to learn how to upload sketches. You can see:

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Note: It is able to generate another signal when it’s being pressed down. However due to the limitation of
the number of Grove signal cable, the module is made without output of this signal.

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5. Resources
Encoder Spec
Demo in Arduino forum
TimeOne Lib
Encoder Lib
Grove-Encoder Eagle files

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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.