150 degrees represents the relative zero position of the servo
right_shoulder_flexion  ( + grade ) move up
right_shoulder_flexion  ( - grade ) move down
left_shoulder_flexion  ( + grade ) move up
left_shoulder_flexion  ( - grade ) move down 
servo connection diagram
# all servo zero 0 right_shoulder_flexion(0)  left_shoulder_flexion(0)  right_shoulder_rotation(0)  left_shoulder_rotation(0)  right_elbow(0)
 left_elbow(0)
# arms up 
Servozero()
right_shoulder_flexion(40) 
left_shoulder_flexion(40)
# arms down 
Servozero()
right_shoulder_flexion(-40) 
left_shoulder_flexion(-40) 
# arms front 
Servozero()
right_shoulder_rotation(80)   
left_shoulder_rotation(80)  
# arms rear 
Servozero()
right_shoulder_rotation(-80)   
left_shoulder_rotation(-80)