The SeeSaw, a new unique $5 microcontroller can be used to give your Raspberry Pi more real-time inputs and outputs along with controlling addressable LED's such as ws2812's aka adafruit's NeoPixel.
The board contains a standard 32bit atmel microcontroller, but what makes the board unique and affordable is the fact that there is no USB connection, in fact the board has to be controled via i2c from another microcontroller. This tutorial will use a raspberry pi for this task although you can easily sub in an esp8266 or whichever board turns you on most this week.
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