Beginners: please read this post and this post before posting to the forum.
0 Members and 1 Guest are viewing this topic.
Received signal strength indication -
we can determine distance of an object through the strength of the return signal.. like for our case, IR.. the attenuation of signal by the distance it traveled assuming no other interference.. this was the suggestion of our adviser. wherein the returned modulated frequency will be used to assume distance.. that the robot will stop if the calculated distance(considering noise here) is like for example less than 1m.
Aha, it helps writing it out in full the firsst time when usin self invented acronyms.
So... not so self invented. Either that or 'fate' help write the indicator panels on all the radios with RSSI indicators I have ever seen.
Apparently not, just obscure enough that it ought to have been spelled out, so as not to waste peoples time Gogling stuff.Glad you enjoyed your time spend searching and your "field day"
the robot wouldnt be able to detect if its the user or an obstacle is up in front
Don't worry fate, Soeren is a wise old man and I had to get my jab in when I could, as the opportunities come few and far between. Quotethe robot wouldnt be able to detect if its the user or an obstacle is up in frontI wouldn't say that is such definite terms, because like i said before, you could get fancy with your code such that if there's an object in front and the IR beacon is being received, object = user. If there's an object in front and beacon isn't being received, object = obstacle.
Quote from: necxz on September 04, 2010, 09:18:48 PM What do you mean either sides?The red is the IR beacons and path, the blue is a forward looking ultrasonic that is used to maintain distance, and the yellow are side looking ultrasonics to avoid hitting someone. Quote from: necxz on September 04, 2010, 09:18:48 PMwhat if b/w the robot and the user suddenly a person blocks his path? There is no simple answer to this problem. Any range sensor won't be able to make out a obstacle versus the person it is suppose to be following. The only thing I can think of, is if that IR beacon tells you it lost the other beacon completely. If the IR beacon lost signal, and there's something close in front of the robot, you can assume it's an obstacle and not the person to follow.
What do you mean either sides?
what if b/w the robot and the user suddenly a person blocks his path?
Instead of using IR Rangefinders, you could use an IR emitter on the master (the person who the robot should follow) and a IR camera on the slave.
are IR really used in line-of-sight communications only? that blocking the signal could mean a signal loss? it's quite a puzzle to me where in this video, obstacles are present (such as the sofa) and still the beacons were able to detect each other. I mean did i miss something here? Beacon Robot
You are comparing apple to oranges here. First, they are using an IR beacon for bearing, not an IR rangefinder.