ACE 6494-4 Mini MP3 Player Module for Arduino
Pin Configuration:
1: VCC: Module power input: 3. 3V—5V, 5V is recommended
2: RX: UART serial data input
3: TX: UART serial data output
4: DAC_R: Audio output right channel: Drive headphones, amplifier
5: DAC_L: Audio output left channel: Drive headphones, amplifier
6: SPK2: Connect small speaker: Drive less than 3W speakers
7: GND: Power ground
8: SPK1: Connect small speaker: Drive less than 3W speakers
9: IO1: Trigger port: Default previous song (long press volume down)
10: GND: Power ground
11: IO2: Trigger port: Default next song (long press volume plus)
12: ADKEY1: AD port 1: The first song when triggered (long press cycle first song)
13: ADKEY2: AD port 2: Fifth track when triggered (long press cycle fifth track)
14: USB+: USB+ DP: Connect U disk or USB port of computer
15: USB-: USB- DM: Connect U disk or USB port of computer
16: Busy: Playback status: With audio, output low. No audio, output high