Button

• Board pin A0 to button input
• Board GND to button GND

Potentiometer

• Board GND to potentiometer pin 1
• Board pin A1 to potentiometer wiper
• Board 3.3V to potentiometer output

Switch

• Board 5V to switch input

L9110 IC

• Cassette motor wire 1 to L9110 pin 1
• Switch output to L9110 pin 2
• Switch output to L9110 pin 3
• Cassette motor wire 2 to L9110 pin 4
• Board GND to L9110 pin 5
• Board pin A3 to L9110 pin 6
• Board pin A2 to L9110 pin 7
• Board GND to L9110 pin 8

Cassette Power Terminal Block

• Board 3.3V to cassette player positive terminal
• Board GND to cassette player negative terminal