expanded with more tests and slightly improved internal code

[FloppyDisck]

No description provided.

[FloppyDisck]

@haraldkubota Do you think you could run this version and confirm that it works? I don't have an SHT31 currently.

[haraldkubota]

Tested and I cannot compile it:

$ cargo build
 Compiling rp-sht30 v0.1.0 (/home/harald/src/rust/rp2040/sht30)

error: no global memory allocator found but one is required; link to std or add `#[global_allocator]` to a static item that implements the GlobalAlloc trait

I use

#![no_std]
#![no_main]

and Cargo.toml contains

sht31 = { git = "https://github.com/FloppyDisck/SHT31-rs.git", branch = "improvement" }

Somewhere is a hidden alloc happening...

[FloppyDisck]

@haraldkubota Thanks for the help! I ended up adding an example for an esp32 for quick testing on future versions. You can always add an rp2040 example if youre interested.