Added /altitude_node/enable topic to disable PID
Also, added node_control.cpp and Velocity2D.msg, which should have beencommited before but apparently weren't.
Added altitude_node and node_control
node_control listens to /mikrokopter/thrust, yaw, and velocity, andpublishes control messages using nav_lib. altitude_node publishes to/mikrokopter/thrust using PID_control on barometer values.
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