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Originally Posted by Gdeaver
Don,
The real test is to have the sonar on a bot executing an autonomous move and have another sonar firing at it. How bad is the interference? I only have 1 SRF04 or I would do some testing. I suspect that there will be problems with multiple sonars on the field. This could be problematic for Vex competitions given the smaller field. Because of the smaller Vex field, the Sharp 5' IR sensor is a natural if only Vexlabs would package it and make it an official VEX sensor.
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I would suspect that since they're all running on the same frequency, the error could be terrible just depending on the luckiness of when their ultrasonic pulses hit your sensor (if you get really unlucky it hits you right after your ping, giving you a reading of 6 inches when they're 20 feet away).
This is part of the reason I'm still considering IR. A newer Sharp sensor has a range of 10' and has a significantly smaller beam (5 degrees), which can be both a plus or minus. The beam is small enough and and has a shorter range that I think interference would be very uncommon from other IR sensors (considering the same type of IR sensors are used on almost all mini-sumo bots without much, if any, interference, I think there won't be much problem on the FIRST fields). If FIRST were to introduce the IR beacon back into the game (from 2004), could this potentially disrupt the Sharp sensors?