Seeed Grove-Speaker User manual

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Grove - Speaker
Version：1.0
Release date：9/20/2015
Wiki: http://www.seeedstudio.com/wiki/Grove_-_Speaker
Bazaar: http://www.seeedstudio.com/depot/Grove-Speaker-p-1445.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

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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- Speaker is a module which consists of power amplification and voice outputs. The loudness can
be adjusted by the on-board potentiometer. With different input frequency, the loud-speaker generated
different tones. Coding the music into Arduino, DIY your own music box!

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2. Features
Volume Adjustable
Grove Interface

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3. Specifications
Item
Min
Typical
Max
Unit
Working Voltage
4.0
5.0
5.5
VDC
Voltage Gain
-
-
46
dB
Band Width
-
-
20
KHz

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4. Usage
The speaker can emit a variety of sounds like a car horn, doorbell and ignition. The different sounds are
based on the frequency of the input signal.
You can supply different frequency signal to this module with Arduino. Arduino generates these signal via
PWM or even digital write and delay. Here we are going to show you how to generate these signals using
delay (), the speaker sound bass 1~7.
/*macro definition of Speaker pin*/
#define SPEAKER 3
int BassTab[]={1911,1702,1516,1431,1275,1136,1012};//bass 1~7
void setup()
{
pinInit();
}
void loop()
{
/*sound bass 1~7*/
for(int note_index=0;note_index<7;note_index++)
{
sound(note_index);
delay(500);
}
}

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void pinInit()
{
pinMode(SPEAKER,OUTPUT);
digitalWrite(SPEAKER,LOW);
}
void sound(uint8_t note_index)
{
for(int i=0;i<100;i++)
{
digitalWrite(SPEAKER,HIGH);
delayMicroseconds(BassTab[note_index]);
digitalWrite(SPEAKER,LOW);
delayMicroseconds(BassTab[note_index]);
}
}
Note: Due to the influence of the capacitance, the module can only output the bass signal, and the treble
is unable to emit.

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5. Resource
Grove - Speaker Eagle File
How to generate different tone with MCU
Grove_-_Speaker_v1.0_brd.pdf
Grove_-_Speaker_v1.0_sch.pdf
LM386 Low Voltage Audio Power Amplifier Datasheet

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