Hello everyone,
This is a university project. I'm required to design a smart stick for visually impaired people and it should be able to detect obstacles. I think HC-SR04 distance is a good choice since it's cheap and the detection range is longer than infrared detectors.
But i do worry about its detection accuracy. For example, what if there's a horizontal bar hanging in front of the visually impaired person? Can HC-SR04 still be able to detect it since theer's nothing below the bar.
Ps. Are there any sensors which are capable of detecting dynamic changes of objects, such as moving vehicles.
No detector is perfect, and if the "horizontal bar" is not in the sonar beam, of course it will not be detected. Do the best you can.
There are radar and sonar Doppler motion detectors, but obviously, they won't be useful if attached to a moving object or person.
It obviously doesn't exist now
Does the UltraCane not count?
LiDAR should do quite well. It can be used to scan the environment, making someone aware of not only that there is an object, but also where it is.
For this, an Arduino is out - maybe an RPi can handle it. Maybe. It's a lot of data to process, ask the self-driving car folk how they do it. It won't fit in a stick.