Hi guys!
Finnally solved the problem! To get enought current to enable a transistor you need to do a litle electronic and risky change in cc2540!
Get current before the resistor, otherwise it will be very low and not enought to open transistor!
Its risky because you need to weld a wire before the resistor! Do a mistake and your game is over!
thanks to all that tried to help, specially YiKai Chen !
