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I would say, ultrasound is perfect FPGA application. One ultrasound channel can be replicated many times. FPGA size is the limit. Especially now when Raspberry Pis are unobtainium.

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This is basically the case for any digitally controlled effector/sensor. Need a serial bus to get data from some ADCs? An FPGA can do N buses in parallel. Need a PWM to control a motor? An FPGA can do N PWMs in parallel.

The problem of course is that the effector/sensor is usually still a physical object that has a cost to replicate, even though the control circuitry in the FPGA is free to replicate. As is the case with ultrasonic transducers.

Well, not many people know verilog/vhdl

Chisel is a Scala DSL and can be easier to learn for some people.

1. I find Verilog 10x easier than Scala.

2. I have never managed to finish a Chisel project. Every time some language oddity or tool issue makes me switch back to the good old HDLs

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