After 18 days wait, I have received no response from Paul so I assume he must be away or otherwise distracted.
I have come to the conclusion that the problem is a lack of serial communication between the EmonPi board and the RPI3 as I can see pulsing on the TxD lead from the ATMega328 and nothing on the RxD.
I am aware of the need to change the Uart over from UART1 to UART0 and have done the requisite steps except when I enter the last step:
sudo systemctl disable hciuart
I get an error message - see below
looking at the config.txt file I see:
Disable Pi3 BT (Not used EMONSD Nov 2017) (Note there is no hashtag at the start of the line??)
#dtoverlay=Pi3-disable-bt
# Switch Pi3 Bluetooth function to use the mini-UART (ttys0) and restore UART0/ttyAMA0 over GPIO 14 & 15.
Note This may reduce the maximum useable baudrate.
dtoverlay = pi3-miniuart-bt
After exiting and trying to stop BT modem trying to use UART by entering the following command
sudo systemctl disable hciuart
I get: failed to disable unit: No such file or directory.
I think I am getting closer to resolving the issues (caused mainly due to my lack of experience), so once again, I would like some assistance and guidance to resolve this issue. (Note I have loaded emonpi Build - EmonSD-13Jun18)
Paul, Glyn, Trystan and anyone else, can you offer any guidance please?
Dave