OT - Bluetooth serial comms issues

[Scampy]

I've just scoped the output from the logic shifter, seems the signals are swinging from 5v to 3.3v rather than 5v to 0v

[Scampy]

Seems the logic level shifter is the cause. Using simple voltage dividers on both RX and TX lines it worked fne

[Dave]

Are you VCCA and VCCB are connected to the correct voltages? Also are you sure you have the correct logic level inputs/outputs connected to the correct level shift pins?

[Scampy]

Hi Dave,

Yes, 3.3v and 5v sides are correct voltages, and I tried all the pins A1-B1, A2-B2 etc