Wiring - renaudrenaud/ArduinoLCDVumeter GitHub Wiki

So you have:

• an Arduino
• an LCD 16*2 with I2C backpack
• a 3.5 stereo jack

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On the backpack you have:

• VCC => 5V
• GND => GND
• SDA => A4
• SCL => A5

For the stero jack:

• GND => GND
• LEFT => A0
• RIGHT => A1

If you have a momentary switch:

• One side to GND
• The other side to RX0