Quote:
Originally Posted by Wzup4021
Well, this is second hand information from a mentor (my first year on the team). He said that after they got to a certain distance (I assume not to far out of range) the cone of the radio waves became big enough that it had a half second delay, along with it not being accurate enough to pin point the target, and was picking up things farther away and occasionally registering them.
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As long as you are in range of the sensor you shouldn't have much of a delay. The ultrasonic sensors use sound waves, which travel ~1116 ft/s
For the maxbotix sensors the max range is 255 inches or 21 feet, so at the max range, the sound travels a total of 42 feet for a travel time of ~37 ms.
If you look at the maxbotix datasheet they show approximate detection fields based on various targets. For long distance they use a 12" wide target and can detect it within a 2' variation side to side. For closer range they use small dowels to show the side to side bounds of where the sensor can detect. Different sensors from them have different side object detection ability.
Quote:
Originally Posted by otherguy
It's range is 1.5" to ~9.5'. Were you operating outside this window.
I've also had good luck (outside of FRC) with the Parallax PING sensors.
I haven't used them myself, but there is quite the range of options available from maxbotix. They have sensors that supposedly can measure to the cm resolution at a range of up to 35ft, which is pretty amazing. You have a $30 voucher for this company in your kit of parts. |
I would highly recommend either of these. With the maxbotix sensors you get a much wider range of sensors to choose from, and they also have a higher resolution product line which may be useful. Their standard sensors have a resolution of 1 inch, and their high resolution sensors claim to have a resolution of 1mm. Definitely use the KOP voucher at least.