Bluetooth BT 4.2 Audio Play Board EDA42 [Version]


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Support to play music by:

  • Bluetooth Stream, support up to Bluetooth version 4.2
  • USB portable disk file play
  • MicroSD disk file play


  • Support Bluetooth control by android APP
  • Support music file WAV, WMA, FLAC, MP3, APE.
  • Support infrared control
  • Support FM
  • Support microsd or USB disk file play, notice microsd card has highest priority.
  • Support Bluetooth phone calling.
  • Support music speed in or back
  • Support memory of stop, volume keep when power lost, music auto start on last time disconnect or stopped.
  • Support multiple EQ features.

Features of buttons:

  • EQ Switch by button – normal, class, jazz, rock, bass, pop
  • Back / Next – short press for back and next. In radio mode, long press for back /next to next station.
  • PLAY – play / pause, searching  radio station in radio mode.
  • MODE: mode section.

Board Features:

  • FM_ANT on installation hole next to microsd card slot, use antenna in package.
  • FM_ANT pin, can solder a soft wire as antenna.
  • On Board Bluetooth antenna, maximum distance up to 15 M
  • Mute – mute control, when no audio output, mute on low TTL, and vice verse. This can push amplifier board into sleep mode when not play.
  • On board Bluetooth speaker, support bluetooth call and incoming call phone number playing.
  • On board audio output – 3.5 mm jack, can drive earphone directly.
  • On board micro USB power supply – Can use power bank or phone charger, or directly use DC 5V to power up the board.
  • On board infrared receiver, can use with our infrared controller.
  • USB / microSD disk port – can play music when U disk or microsd card insert, system enter into music mode directly.
  • On board protection diode, when use 3.7V lithium battery, this should be short connected.
  • Board dimension 40×50 mm, installation hole M3.

Connection / LED mode:

  • Bluetooth mode: quick blink – pairing, constant on – paired, slow blink – playing.
  • FM mode: slow blink – normal standby, quick blink – searching station.


  • Default in Chinese language, if you need, please put the update file (get in wiki page) in U disk and plug on, power up, wait up to 10 seconds board will make beep alarm, now you can disconnect.


  • Basic main board only – include main board only.
  • Advanced – include main board, IR controller, FM antenna, and case. Magnetic bottom screws can make it easy snap on anywhere.


Documentation of APP see here.

Additional information

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