How accurate are VEX distance sensors at an angle?
I currently don’t have access to a distance sensor, but from previous testing I’d say they match up pretty accurately to the VEX website. I didn’t test the accuracy at an angle though. I know that the measurements will be pretty bad when at a large angle to the wall, but does anyone know the rough error percentage at a certain angle or an angle with the largest tolerable error?
Very accurate. In skills when we went all the way across the field it always lined up if you gave it the right coordinates
By using the Ultrasonic Distance Sensor, it will sense distance from the Output (Left Circle). If it is a normal distance sensor, it will sense directly the distance from the “eye” to the object in its way. That is how accurate these things are. (Note, Distances can be inaccurate at an angle)
Please, keep in mind that, even though you may get it to work very well in your controlled build and test lab, it may experience noisy environment in different place, for example, a school gym where competition is held.
Over the years, people reported various instances of both ultrasonic sensors not working in pretense of loud music or HVAC noise as well as optical sensors confused by solar or unusual interior light.
Examples:
After you get any sensor to work well for you, try adding some sort of noise filtering algorithm as well as start thinking about testing it in different environments and making contingency plans for backup methods of navigation if the primary becomes unusable.
That’s a good point. From my undewrstanding, you would need at least 3 noisy sensors to use a filter to reduce innaccuracies. How else would you de-noise the data? I might find the range I am sure the DR4B is using the motor encoders and absolute low and high positions to reset.