Which from the three Sharp infrared sensors has the narrowest beam?

Community General Discussions
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1

I already have ultrasonic sensors and I want a narrow beam infrared sensor to go with them. I have found three versions. The 10-80cm short range Sharp GP2D12 and Sharp GP2Y0A21YK, from which the GP2D12 is more expensive and the 20-150cm long range Sharp GP2Y0A02YK0F sensor.

I could only find that the short range Sharp GP2Y0A21YK sensor has a beam less than 40 degrees, but I couldn't find anything about the beam width of the other two sensors!

I want the Sharp sensor to scan the object the ultrasonic sensor detected. Ideally I would use a laser scanner to be able to determine the width of the object, but laser scanners are rather expensive so an infrared sensor has to do the job. But which sensor has the narrowest beam??? Oddly enough even the datasheets of the Sharp sensors didn't supply this info so I guess you can only know which sensor works best for scanning purposes by experience, but I rather not buy three sensors when only one of them is useable.

Regards,

Paul

 

2

Another Sharp sensor

Found a 4th sensor, a short range Sharp GP2Y0A02YK. Maximum “allowable angle >40 degrees”.

3

frits made a post about using IR to estimate the size

of an obstacle.

https://www.robotshop.com/letsmakerobots/node/316

Looks like he was using an ultrasonic sensor. It really shouldn’t be any different for IR.

4

IR vs ultrasonic

From what I understand is the beam of an ultrasonic sensor too wide to do other readings than what’s in front of the sensor, no matter if it’s a mere brick or an entire wall.

5

Bought one

That solved that, a just bought a Sharp GP2Y0A02YK0F  with a range from 20-150cm. When I get this work as envisioned I can think about data logging and after I have solved that I can think of why my robot behaves that way. I still haven’t figure out a purpose for my robot. When I can’t think of anything I can always make a autonomous vacuum cleaner out of it. lol