Pin
| Description
|
1 VCC
| Input voltage 3.2V to 5V
|
2 RX
| UART serial receive
|
3 TX
| UART serial transmit
|
4 DAC_R
| Audio output right channel drive earphone and amplifier
|
5 DAC_L
| Audio output left channel drive earphone and amplifier
|
6 SPK_1
| Speaker
|
7 GND
| Ground
|
8 SPK_2
| Speaker
|
9 IO_1
| Short GND to play previous song. Long GND to decrease volume
|
10 GND
| Ground
|
11 IO_2
| Short GND to play next song. Long GND to increase volume
|
12 ADKEY_1
| Trigger play first segment
|
13 ADKEY_2
| Trigger play fifth segment
|
14 USB+
|
|
15 USB-
|
|
16 Busy
| Output playing status: low=playing; high=stopped
|