Grove Recorder v2.0

Grove - CRecorder v2.0 is a upgraded recorder with enriched features. It can record 8-20 seconds[1] audio with high-quality and natural voice. In addition, it also gets sound volume control and playback functions. With MCU such as Seeeduino or Arduino board, you can prototype various applications quickly with user-friendly interfaces.

[1] Recording time could be customized(if you require) by replacing different resistor the solution to do this will be described in later sections.

Version Tracker

Product revision	Release date	Support status	Notes
V1.0	Apr 2014	Supported	-
V2.0	Oct 2015	Mainstream support	Add speaker volume controller. Add NS8002 amplifier to enhance power. Add Rec pin Switch for switch Rec pin.

Features

• Easy-to-use with sound volume control, record, playback functions and grove interfaces.

• Easy to be programmed for plenty of applications with MCU.

• Automatic power down mode, variable recording and playback duration, non-volatile storage.

• Low power consumption.

• Shipped with a speaker (8Ω/2W).

!!!Tip More details about Grove modules please refer to Grove System

Application ideas

• Toys.

• Alarm.

• Short-duration-echo required applications.

Specifications

Parameter	Value
Operating voltage	3.3~5.0V(DC)
Ripple(at Max power)	≤ 50mV
Recording duration(default)	12 seconds(MAX value)[2].
Playback duration(default)	12 seconds(MAX value).
Sample rate	53 kHz
Chip	ISD1820PY(Datasheet), NS8002(Volume Amplifier)

Platforms Supported

[2]You can replace the resistor shows as following to change recording duration.

Red rectangle marked area

Note Playback duration will be same with Recording duration as it changes. Different kinds of resistor will lead different Recording duration as the following table shows.

ROSC	Duration	Sampling Frequency	Input Bandwidth
80 KΩ	8 secs	8.0 KHz	3.4 KHz
100 KΩ (default)	10 secs	6.4 KHz	2.6 KHz
120 KΩ	12 secs	5.3 KHz	2.3 KHz
160 KΩ	16 secs	4.0 KHz	1.7 KHz
200 KΩ	20 secs	3.2 KHz	1.3 KHz

Hardware Overview

Grove interface

Connect main control board such as Seeeduino board with Grove - Recorder.

Speaker interface

Connect Grove - Recorder with speaker.

Rec shaft

Start recording.

Volume control interface

Control volume for speaker.

MIC

Microphone for recording.

IDS 1820PY

Microcontroller.

Running indicator

Light on while you are recording. Light out as you stop recording or recording time exceeds record duration.

Rec pin Switch

You can switch Rec pin ON/OFF, so you can disable or enable MCU controlled recording.

Grove wire

Connect main control board with driver board.

Speaker

Parts list

Parts name	Quantity
Grove - Recorder v2.0	1 PC
Grove wire	1 PC
Speaker	1 PC

Get started

Materials required

• Seeeduino x 1

• Grove - Button x 1

• Grove wire x 1

Preparations

Refer to the following guides to build a appropriate IDE:

Note We have used Seeeduino in this case.

Getting Started on Windows

Getting Started on Mac OS X

Hardware connections

• Connect all modules as above figure shows.

  • Grove - Button > D2

  • Grove - Recorder > D7

Software Work

Test code as below, copy to your Arduino IDE, then click Upload(CTRL+U) to upload code to your Arduino.

// demo for Grove - Recorder

const int pinButton = 2;
const int pinRec    = 7;


void setup()
{
    pinMode(pinButton, INPUT);
    pinMode(pinRec, OUTPUT);
}

void loop()
{
    if(digitalRead(pinButton))      // button pressed
    {
        digitalWrite(pinRec, HIGH);
        delay(200);
        digitalWrite(pinRec, LOW);
        while(digitalRead(pinButton));  // until button release
    }

    delay(10);
}

Test it

• After connection works and software works finished, press shaft Rec to start recording.

• Then press button on Grove - Button to playback.

• You can also adjust volume with Philip screw driver.

Resources

• Schematic file in Eagle format

• Schematic file in PDF format