Hello.
I m totally newbie to robotics. :-[
But i got this crazy idea to learn
So..here is my "dream"......
I want to create something like low range triangular "radar". The main idea is to create 3 separate radar stations. Every one will use two ultrasonic sensors to detect objects in the sky. The sensors will be able to scan 3D so i think i ll need 2 steppermotors for the motion (1 for 360 degree round and 1 for up-down)...right ???
And all the data must transmitted somehow (i belive ir transmitter) to the "base" where i want to compile them in otder to detect and "aim" the "object".
I m not sure hoh much clear i was :-/
So far i know that i ll nedd the folowing.. For each "radar"
2 steppmotors
2 ultrasonic sensors
1 Motor/Stepper/Servo Shield for Arduino
1 ir transmitter
and of caurse 1 adruino
What i want to know is witch version will be good for me ???
Arduino Duemilanove ATmega328/168 or smaller ver ?? I m missing something ???
And for the "base"
2 steppermotors
1 ir receinver
1 Motor/Stepper/Servo Shield for Arduino
1 arduino
Do you think that this project is possible ???
And the part list is completed??
Basically this should be possible although youre extremely limited with Ultrasonic and IR. I would guess you wouldnt get farther than 5m with each IR emitter from the base station, giving you 10m in total. Now depending on the Ultrasonic devices you use this would limit your three dimensional 'viewing' ability to a few metres.
Most Ultrasonic range finders i know allow you only up to 6m anyway, so taking the maximum values (that i know) this would give you an exact area of a few centimeters to 3m for three dimensional tracking on quite a small cone in front of the center module...
This might be totally far from reality, but thats based on parts that i know of..
Thnx for reply
I know that most ultrasonic sensors got a few metters range (5 to 7 max).Its not much..but ok for me (you know any other cheap way to maximize the rage ???)
The main question is IF adruino is enough to support my needs for one "radar" ??? witch version will be good for me ???
Arduino Duemilanove ATmega328/168 or smaller ver ?? to reduce the cost..???
Thnx
hm, the basic calculations are quite easy.
Each of the radar stations would have to give three values: Pan, Tilt and Distance. Three values which shouldnt be much to calculate into some three dimensional value. I guess a 168 could handle it easily although i would go for the 328 as it is simply the better version.
keep in mind the distance between the base station and the two radar stations. With IR you are still quite limited. Maybe some equally cheap (or a bit more expansive) Transmitters will do the job better than that?
Now... i had once something similar in mind and digged for the files - i found an old one discribing (for myself) the detectable area..
this looked like the best possible solution yet still it was far from something useful (for me..).
Maybe it can help you, although i guess you have already done such 'sketches'.
The pic is pretty self explainatory - the green area is where 3D positioning is possible, the areas in the circles are less perfect, yet 3D positioning is possible to some extend (you still have pan, tilt and distance, yet only from one of those things...
So.. all in all, whatever you decide to use - keep in mind that you should have at maximum half the radius of the distance measureres...
i had once something similar in mind and digged for the files
Did you finish the project ???
still it was far from something useful (for me..).
same here ;D i just decided to build something different
I never finished - or rather, i never started ;0)
My goal was more or less to have a 3D Scanner and distance measurer for outcrops to have reliable data.
Just imagine a 3D scanner to measure the height of a wall ;0)
The main downside of all this was for me that i had to juggle - either i had one ultrasonic range finder with acceptable range but higher error rate or i had two with less accaptable range yet higher precision. As i said, all i knew were like 6m range devices, nothing more ;0) And when i finally was at the site of making a map off i saw that i had to measure heights of tens of metres, at one place roundabout hilarious 170m x 70m - so my idea of measuring distance with Ultrasonic was totaly unfitting ;0)
BUT i came to think of other stuff like DIY laser range finders, but this would only work with a pc, not an arduino...
Nachtwind >>>keep in mind the distance between the base station and the two radar stations. With IR you are still quite limited. Maybe some equally cheap (or a bit more expansive) Transmitters will do the job better than that?
