**SOLVED** Arduino Uno / I2C 0.56" 7-segment LED backpack troubleshooting

Other Hardware LEDs and Multiplexing
2

Are you using Library for it or you are writing codes yourself?

The I2C address range for the IO Board: 0x70 - 0x77.

So, run an Address Scanner Program (see the attached file) to know the address of the IO extender.

Address_Search.ino (715 Bytes)