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JerZ's picture

You could also mount the sensors on servos to scan the area in front of and around the bot. They could be pointed towards the direction of an intended path and could be used to help eliminate blind spots. This approach adds to the complexity of the software but could reduce the total number of actual sensors. Nice design, looking forward to seeing what you come up with.

Duane Degn's picture

I was about to suggest mounting sensors on the arm itself. The arm could be used to look around.

@AouTeam, there are many different ways to mount ultrasound sensors. You can get sensor pretty cheap on ebay, just get a bunch and try them out.

i need exactly the places where i shall put my ultrasonic sensors 

TeleFox's picture

Try using the LMR Search Page (the link is above the Shout Box, top right corner) and search for things like "ultrasonic obstable avoidance".

You'll find many, many examples of different numbers of ultrasonic sensors used in different configurations. You can compare your robot to some of the other projects here to get an idea of what sort of arrangement will work best for you.

i know that i can find alot of examples but i am asking for advice bro :) 
as this site is full of experts
so plz help me and show me where can i put my ultra sonic sensors and how many sensors i will need  

TeleFox's picture

Does your robot ever move backwards or move forward while turning at the same time?

If you only need to check a wide area in front of your robot you should try using 2 ultrasonic sensors that are crossed like this:
Cerberus v2 

If the robot has to detect objects to the side and back you can just add more sensor pairs. Because your robot is quite large compared to the sensor beam width, using crossed pairs of sensors will make sure you don't miss thin objects like chair legs.

may be in some circumstances it should act like the following 
when it discovers an object infont of it  in this case it has to calculate the distance on the left side and th right side and then go backward for 2 seconds and turn and move in the direction of the bigger number 
left distance > right distance  

TeleFox's picture

Yeah that's a fairly common way of doing obstacle avoidance.

by the way thanks for your help bro 

this robot is our final year graduation project so we have to do it well

 waiting for more replies and more advices from you and from every one :)