He has the processor, of course. But everything else — clock, memory, and power — are from an Arduino Mega 2560. You could argue that’s two chips, but the board actually has several chips on it.

If you've messed with Arduino, the inexpensive micro controller, you'll know that you can run a small motor or turn an LED on and off, but anything else - powering a pump, turning on a light bulb ...

There's the 53x101 mm Mega 2560 with 54 digital I/O pins, the 53x68 mm Zero with 32-bit low-power ARM processor, and the 25x61 mm MKR1000 WIFI with built-in Wi-Fi functionality.