[MAGEEC] Issue running latest interactive_graph.py

[Alex J Lennon]

Hi,

I had a problem with the interactive_graph.py in the latest commit in
branch pyusb of https://github.com/jpallister/stm32f4-energy-monitor
(354251..)

Looking back at the code on the FOSDEM workshop USB stick which works
for me the change seems to be to use a different serial number (MSP0 vs
EE00)

If I revert the call on EnergyMonitor to use the old serial number the
graph runs up,

    em = pyenergy.EnergyMonitor("EE00")

I'm not sure why this is as I'm building and using the latest discovery
firmware as per the Wiki workshop instructions.

Best Regards,

Alex