Hi am tryin to prepare a biped robot.. am using sg5010 rc servos to drive the linkages.. the problem is like am not able to rotate the motor bi directional using a micro controller.. am usin pic 16f877a and ive simulated my code succesfully to obtain varying pulse like 1ms,1.5ms,2ms but yet irrespective of the pule given the motor rotates frm -90 to +90 and stops... help me wat to do.. do i need to connect any drivin ckt between micro controller n motor?? if yes wat ckt do i need to connect??