I've been trying this today and it almost works.

The adc in works as does the serial out and i can see the data on my scope, but the serial lcd does not recognise it. I'll get my logic probe on it and see what values it thinks are arriving.

I believe the problem is that the lcd is expecting N9600 (idle high)

however when you switch from the adc to serial output the pin goes low and it won't come back up even if I send a high pin command? As soon as the serial data has been sent it then idles high. So the false low at the start is corrupting the data i believe.

I'll keep trying. Any thoughts. I tried serout and debug out same result.