Sometimes you need an Arduino for a project, and sometimes you need a Teensy — but why not both? 1bit created this Teensy/Due-ette Carrier Board to house a Teensy 3.2 and an Arduino Due (or Mega 2560), connected via I2C, plus a whole bunch of other stuff!

In addition to the two aforementioned MCUs, the Due-ette contains two A4988 stepper motor drivers, a socket for an ESP8266, two RS-485 drivers, two ADS1115 16-bit, 4-channel ADCs, a WIZnet W5100 Ethernet controller, and two HX711 Load Cell Amplifiers. It can be used for a peristaltic pump as well as all manner of other applications.