The Audio Amplifier Connections:

• AMP VIN to PI 3.3V
• AMP GND to PI GND
• AMP DIN to Pi GPIO21
• AMP BCLK to Pi GPIO18
• AMP LRCLK to PI GPIO19

The LCD Connections:

• LCD BACKLIGHT to PI GPIO23
• LCD SCK to PI SCK
• LCD MISO to PI MISO
• LCD MOSI to PI MOSI
• LCD CS to PI CE0
• LCD RST to PI GPIO25
• LCD DC to PI GPIO24
• LCD VIN to PI 3.3V
• LCD GND to PI GND

PowerBoost Connections:

• PB 5V to PI 5V
• PB GND to PI GND
• Switch between GND and EN