Rainbow HAT has a buffet of sensors, inputs and displays to explore Android ThingsTM. Use it as a weather station, a clock, a timer or stopwatch, a mood light, or endless other things.
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Rainbow HAT also has a full Python API for use on Raspbian just like all of our other HATs that you know and love!
The MagPi said that "Rainbow HAT has an impressive number of features crammed into it, making it useful for all sorts of projects" in their four-star review.
Please note that if you're using Rainbow HAT with a Raspberry Pi 3B+, then you'll need to use a set of stand-offs to ensure that the new PoE pins do not contact components on the underside of Rainbow HAT.
The board is designed specifically to show off the wide range of protocols available on the Raspberry Pi, including SPI (the APA102 LEDs), I2C (the BMP280 sensor and 14-segment displays), GPIO (the capacitive touch buttons and LEDs), and PWM (the piezo buzzer).
Notes: Temperature readings are affected by heat radiated from your Pi’s CPU and the onboard LEDs; calibration can help to correct temperature readings. bstrobl, on the Raspberry Pi forums, suggests to use the formula: corrected temp. = measured temp. - (CPU temp. - measured temp.) / 2. Using a Mini Black HAT Hack3r can also help.