Built one of the first 3d ultrasonic scanner that works in the air to make an autonomous drone [1] [2] [1]: https://www.alextoussaint.com/2021-04-28_How-I-buil

Built one of the first 3d ultrasonic scanner that works in the air to make an autonomous drone [1] [2] [1]: https://www.alextoussaint.com/2021-04-28_How-I-built-an-ultrasonic-3d-scanner.html https://www.alextoussaint.com/2021-04-28_How-I-built-an-ultr... [2]: https://hackaday.com/2021/05/15/a-phased-array-ultrasonic-3d-scanner-from-scratch/ https://hackaday.com/2021/05/15/a-phased-array-ultrasonic-3d...