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Post: The IO Pi Plus is a 32-channel I/O board for the larger size Raspberry Pi models and the IO Pi Zero is a 16-channel I/O board that will work on both the larger Raspberry Pis and the Zero models. Both boards use the same I2C-based MCP23017 I/O controller from Microchip, the main differences are the number of channels and the form factor. The IO Pi boards would be suitable for buttons and LEDs but they will not control servos as they can not generate pulses fast enough. Each channel on the IO Pi can source up to 20mA of current with 125mA in total on a 16-channel bus so if you use it to drive LEDs you will need to make sure your overall current stays below 125mA. For driving analogue servos you can use our Sero PWM Pi board which can control up to 16 Servos. The Sero PWM Pi would not be suitable for controlling a neopixel LED as it can not send data, only PWM signals. Your best option for controlling neopixels would be through the Raspberry Pis GPIO header. Adafruit has a [url=https://learn.adafruit.com/neopixels-on-raspberry-pi]tutorial on its website[/url] for connecting neopixels to the GPIO port.