connecting 3 sonar onto pixhawk

hi , im wanted to add obstacle avoidance function of the drone to pixhawk . Im using 3 sonar , however i dont know how to connect them and how to write the code to display each of the sonar value , can someone please help me ? 

im using pixhawk , mission planner 1.3.37 , AC3.3.3 , sonar EZ0 . 

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