Thank you.  I am very excited about your fast response.

Thank you so much for your response.  The issue is that in your wiki tutorial and any other tutorial online the VCC (red wire) is connected to 5V Arduino which works fine.  When you try to connect the red wire to an external power supply (with a common ground), either with UART  or I2C it does not communicate properly (junk characters appear in the serial monitor) with any baud rate.

Thanks