Hi, thanks for posting the images inline, will do that in future.
I'm not sure that is the problem only because originally I was using the +5V pins and last minute switched to the Vin in case it changed everything. But now I know what the +5V is correct!
I was using a phone power bank for the 5V, but I'm not sure it was required because the Mega was hooked up to USB for the serial monitor.
Should I ditch the power-bank and just link [Nano 5v <----- Mega 5v] and keep common ground?
I have been studying the datasheet for hours, I don't understand the timing stuff but at the end there is a code example so perhaps I might have an attempt at coding from scratch using that as a template? But first I'm going to try and debug what I have because I don't have masses of time because of all the other stuff that needs doing.
I will receive an oscilloscope in this week to test I'm getting the clock signal.
Any other ideas? Should I try pulling down or pull up any of the unused pins? Will this need a resistor not to fry the chip?
I have a suspicion that the Index pin should not have been left floating.
Thanks
Yan