One that you can not only use with your Pi, but as a stand-alone controller. The trinket is a cheap and flexible alternative to a PWM driver, or an analog to digital converter.
Generate precisely timed signals, like the one needed for WS2812 LEDs.Read cheap analog sensors, such as temperature or light intensity.Generate PWM ( Pulse-width-modulation ) signals, for Servos/Variable LED brightness.The Trinket can do many things that your Pi either can't do, or isn't great at: The Trinket and the Pi are a very complementary pair. Warning: Make sure you use the 3.3v Trinket, don't connect a 5v one directly to your Pi! Why Combine A Trinket And A Pi? Programming the Adafruit Trinket from your Raspberry Pi
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