Powering microcontroller using 5v from controller

Hi,
Would it be possible to power a microcontroller (like Arduino for example) using the 5v going to the throttle twist (=the 5v powering the hall effect sensor) ? I am using a 9C controller.

Thank you !

Not sure how much power an Audrino takes but the 5v supply for the throttle can only supply about 50ma or so. Regulator heating may be a problem if the current is too high.

Yes, regulator and the pre-regulator dropper heat dissipation is a potential problem if you draw more than a few mA extra from the 5V line. The real problem is that the dropper resistor in front of the first stage voltage regulator (the 12V FET drive supply) is very load sensitive, and the 5V regulator is driven from the 12V supply. If you draw too much current from the 5V rail then you can drag down the voltage at the 12V regulator and increase the heat dissipated by the dropper resistor. Generally the dropper resistor is sized for around 50ma to 60mA , so increasing the current by more than a few percent may cause problems, depending on the controller and battery voltage.

I went for one of these for my arduino throttle controller:

http://www.ebay.nl/itm/120799147826?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649