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Powering Pixy.

Hi,
I face another issue with the power. When I connect pixy to arduino uno via ribbon cable provided, it seems that my computer cannot give enough current. so the arduino uno and pixy stopped working. I have to connect USB to PIXY and UNo for both set to work.
I did try to supply 350mA of current to arduino uno, but it seems PIXY consume quite a high current and both did not work.

Arduino Uno is rated at about 200mA only from the sources I get.

SO now my only solution is to connect to the 2 pin power supply.

Am I only able to supply 11.1 V or a 5V to the 2 pin power supply ? Which one is more Ideal ?
I can supply 7.2 V but I have to fix another battery which is not ideal.