IR Navigation
Wombax
Posts: 19
Hi, I'm just starting with BS. I use IR for navigation as described in chapter 7. IR reception is ok but I'd like to know if any improvement is possible in order to have a better response ("obstacle detected" or "no obstacle" without intermediate situations).
Using the SSIR module will improve for better obstacle detection ?
Can anyone help ?
Thx, Luca.
Using the SSIR module will improve for better obstacle detection ?
Can anyone help ?
Thx, Luca.
Comments
However, all of these ranges are very limited -- around a few inches. For a longer range 'ping' you could go to the SRF-04 or SRF-08 ultra-sound module.
The range with the Parallax infrared emitters and detectors should be more like a couple of feet - almost up to three feet if the surface detected is reflective of infrared. You can increase the distance detection by using smaller resistors on the LEDs - 220 Ohms or even smaller. The SSIR is the same circuit as what you are using except all of the components are built onto a small PCB.
The Robotics text includes a simple detect/no detect example of PBASIC code.
Ken Gracey
Parallax, Inc.
Since IR is usually used as a 'whisker' collision avoider, I assumed its range was close. Since you're outputting a signal from the IR LED, and reading its 'bounce' with an IR-Decoder, I assumed the range was shorter than that. Thanks.
The latest style of IR emitters and detectors can do over two feet. We recently switched suppliers and got a heck of a lot more range. The range varies significantly depending on the surface reflecting the IR. Our office has black baseboards and they trigger about 6-12" from the walls (duh, we should have used a colored baseboard!). But on a light-colored wood surface or painted drywall it detects at a couple of feet.
I'm pretty certain the SSIRs do the same, unless we've changed the circuit. We have a fish robot (that's right, a robot driven by a Saimese Fighting Fish) in our office which uses SSIRs and they work well with our black baseboard.
Ken