This unit is connected to a POWERTECH MP-3750 via the usb (for a power supply to the UNO board)
The voltage divider is connected to the POWERTECH 'load side' positive and negative so I can read the voltage
The ACS is in series with the 'battery connection' positive of the POWERTECH to read the amps.
When I disconnect the usb the OLED display and board is still 'ON' The OLED display then dims to about half illuminance.
My question is where is it draining power from?
What are the resistor values of the voltage divider.
If too low, then the divider could phantom-power the Uno through the analogue pin.
Leo..
Hi,
A circuit diagram would be easier to understand your project.
If the USB is the ONLY power source to your entire project, do the LED eventually go out?
Thanks.. Tom... 
The values are as follow:
R1=910 & R2=470
No, as WAWA suggested, I think it's a back feed from the battery. I'll increase the resistor values and see if that solves the issue.
Thanks
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