Initializing SimpleSDAudio V1.02 ...initialization failed. Things to check:
* is a card is inserted?
* Is your wiring correct?
* maybe you need to change the chipSelect pin to match your shield or module?
Error code: 3
Using amplifier / active speaker / line-in etc.:(音频输入均是3根线啊 R GND L 我们的单片机才2根线)
Audio-Pin --||--------------[10k resistor]----+----[1k resistor]---- GND
100nF capacitor to amp