Arduino library for reading an array of photocell (LDR) sensors with a sliding-window moving average and configurable threshold detection. Supports multiple sensors with individual sample rates.

Non-blocking, interrupt-driven Arduino library for the VLSI VS1053 audio decoder chip. Streams MP3, AAC, Ogg Vorbis, FLAC, WMA, and WAV from SD card over SPI.

Arduino library for measuring free RAM at runtime. Critical for debugging out-of-memory crashes on AVR boards with as little as 2 KB of RAM.

The original non-blocking, interrupt-driven Arduino library for the SparkFun MP3 Player Shield (VS1053). Superseded by the generalized vs1053_for_SdFat library.