Simple voltage logger

[semicolo]

Hi there, I put my first digispark to good use as a simple voltage logger, recording analog values in eeprom.
Data can then be transferred to a pc by connecting the digispark to an usb port.
I'm using it to record the discharge characteristics of li-ion cells.
You need a push button between P2 and Gnd, connect the voltage you want to monitor to P5.
After a quick press, the digispark starts sending the recorded values as keyboard presses
After a long press, the eeprom is reset to 0xff and a sample is recorder at a fixed interval.

I then used gnuplot to draw the discharge characteristics.

[semicolo]

Oh yeah some may want the sketch

I've noticed something, when I press the button to dump the data, some of the first values are lost, maybe it needs a delay before starting.

[semicolo]

I've got 14 different characteristics now, I can clearly see the cells that I can use together (and the ones that lost half their capacity)
10 more to test!