Electronics > Electronics
Ultrasonic VS Sharp IR
Rebelgium:
Ultrasonic is a bit more expensive, but is it worth it?
I want to use a 180? rotating servo with two Sharp IR sensors on top, and use this to navigate and later on even make maps.
What is best for this application? 2 ultrasonic sensors (= sonar?) or two IR sharps?
I know the range is better, but what about the speed? I want to ratate that servo asap, to have a higher map-refresh rate. Which is faster, IR or US?
Any other things I should know?
Steve Joblin:
Different sensors are made for different conditions. As you might imagine, IR sensors work faster than Ultrasonic sensors (light travels faster than sound).
Admin:
--- Quote ---As you might imagine, IR sensors work faster than Ultrasonic sensors (light travels faster than sound).
--- End quote ---
Although true, there is another bigger reason why IR is faster. US must have a significant time delay between bursts so that there is no 'noise' (literally sound noise) echoing from previous bursts.
--- Quote ---use this to navigate and later on even make maps
--- End quote ---
For accurate map making, IR is by far best. For basic object avoidance, US is best :P
If you really really need speed, consider using multiple sharp IR simultaneously. Ive used up to 3 with good success.
Rebelgium:
I am going to use 2 IR Sharp sensors on top of my rotating servo, This should give me 180? front view.
I'll use these to avoid objects and to make a map. For the object avoidance I'll also use basic IR proximity sensors.
Does this sound like a solid plan to you?
I want to buy this so I can start simple (2 IR Sharp sensor that don't move), and advance later on when I'm more experienced, without having to buy new stuff.
Admin:
Sounds good to me. :)
For my 2 IR robot, the left sensor scanned 0 to -50 degrees, while the right sensor scanned 0 to +50 degrees. A full scan was about ~.8 seconds on an HS-311 servo.
In the future, if you want to get more complicated to increase speed and stay accurate . . . do slow high accuracy scan just in the direction of movement, then do a faster low accuracy scan on the sides . . .
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