Me audio player

1. Overview

Me Audio Player module, compatible with the entire series of MakeBlock control boards, is able to play music and records with a built-in voice decoding chip. This module’s connector is marked in white, meaning that it is controlled by I2C signals, and must be connected to main board’s white-marked port. Insert the TF memory card to feel the joy of music and it is very convenient to use.

2. Technological Specifications:

Working voltage: 5V DC
Microphone sensitivity (1Khz): 50-54dB
Microphone impedance: 2.2 kΩ
Microphone signal to noise ratio: 58 db
Speaker rated power: 1W
Speaker rated impedance: 8±15%Ω
Communication method: I2C
Largest electric current: 500mA
Module size: 56 x 41 x 28 mm (LxWxH)

3. Characteristics

Onboard blue LED solid on means music playback mode, flashing means recording mode;
High sensitivity to sound;
The module’s metal hole area is the reference area in contact with the metal beam;
With reverse polarity protection, reverse power supply will not damage the IC;
Supports mBlock graphical programming, suitable for all ages users;
Convenient connection by using the RJ25 port;
Modular installation, compatible with LEGO series;
Module supports Micro USB to copy audio files directly without the need for a card reader;
Module directly supports MP3, WMA, and WAV files.

4. Connection Method

● RJ25 connection

Since the Me Audio Player module’s connector port is marked in white, when using the RJ25 port, it needs to be connected to the port marked in white on the main control board as well. Taking MakeBlock Orion as an example, you can connect it to ports 3, 4, 6, 7 and 8, as shown.

5. Programming Guide

● Arduino programming

If you are using Arduino programming, you must call the Makeblock-Library-master to control the audio playback module.
This program controls Me Audio Player module through buttons through Arduino programming, achieving the playback, pausing, start recording, and stop recording.

Me Audio Player module-function list

Function	Instruction
MeAudioPlayer(uint8_t port)	Choose a port
playMusicFileIndex(uint16_t music_index)	Specify audio file index playback	Numbers：1.2.3……
pauseMusic()	Pause playback
stopMusic()	stop playback
playNextMusic()	Next
playPrevMusic()	Previous
setMusicVolume(uint8_t vol)	Set the volume	Range0~100
setMusicPlayMode(uint8_t mode)	Set playback mode	0.Single play 1.Single cycle 2.Playlist loop 3.Random play
startRecordingFileName(char *str)	Select a file name to begin
stopRecording()	Stop recording

● mBlock programming

Me Audio Player module supports the mBlock programming, and the following is an introduction to the module instructions.

Code	Description
	Choose a port
	Specify audio file index playback
	Specify the audio file name playback
	Set playback mode: Single play, single cycle, playlist loop, random play
	Play previous audio
	Play next audio
	Pause/resume playback
	Stop playback
	Volume setting
	Increase volume
	Decrease volume
	Begin recording with the name “T001”
	Stop recording

The following is an example of how to use mBlock to control the Me Audio Player module：

This program can control Me Audio Player through the Me 4 button module. To achieve playback, pause, start recording, and stopping recording audio files, the following are the results:

6. Audio file format instructions:

Please add an appropriate delay after After the volume setting blocks, and wait for it to take effect;
Using external memory TF card to store audio files, support MP3, WAV, WMA high quality audio format files;
Using FAT and FAT32 file systems;
The audio file naming format supports English naming (case-insensitive). English letters and numbers are mixed and the length of the naming is recommended to be less than 8 characters. For example: Hello.MP3, T002.MP3, and R000001.MP3. (It is not recommended to use pure number naming);
Sorting of audio files in TF card: It is recommended to sort by file name;
This module does not support Chinese naming of audio files;
Do not use special character names such as: v1.0″, o_o0, … ( not support).