generic circular buffer implementation in C
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circbuf/meanbuf/README.md

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Averaging float buffer
======================
*(You can adjust it to use doubles, if you prefer.)*
The `meanbuf_create()` function allocates a buffer.
You can then call `meanbuf_add()` to add a new value into the buffer (and remove the oldest).
This function returns the current average value.
This buffer can be used for **signal smoothing** (such as from an analogue sensor).