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.

Chip belongs to JL, you can find referential schematic here. Upgrading language tool, phone app please also see on the page.

Additional information

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