Getting Started with the Octasonic Breakout and Rust
Follow the instructions at http://rustup.rs/ to install Rust.
I have noticed that some releases fail to install on the Raspberry Pi. You can install a specific version instead (1.25.0 works great).
Testing the Board
The source code for the Octasonic library for Rust is available here and includes examples for blinking the LED on the board and for displaying measurements from the sensors.
For example, to make the LED on the board blink, run this command:
cargo run --example blink