Society of Robots - Robot Forum

General Misc => Misc => Topic started by: Razor Concepts on October 24, 2009, 05:40:16 PM

Title: How does the iRobot create IR beacon work?
Post by: Razor Concepts on October 24, 2009, 05:40:16 PM
I have worked with the iRobot create, a plain version of the roomba. Like the roomba, the create has some kind of 360 degree IR sensor:
(http://electronicdesign.com/Files/29/14970/14970_Fig.2.jpg)

That little disc has a inverted cone-shaped mirror to presumably deflect the horizontal IR beam down vertically. But how does it detect around 360 degrees? Is there just a circle of small IR receivers?
Title: Re: How does the iRobot create IR beacon work?
Post by: waltr on October 24, 2009, 06:05:09 PM
What I recall reading is that there are four small mirrors that reflect the beacon light down to four photodetectors one for each direction.