The full write-up is in the included PDF file, and describes the set-up of an Arduino Nano sitting between throttle and controller, and taking feedback from a current sensor.

In terms of the hardware, this robot uses an Arduino Nano as the brain, two motor drivers to control the DC motors, a wireless transceiver module to receive signals from the transmitter device ...

For his MPPT, [Debasish] is using an Arduino Nano for all the math, a DC to DC buck converter, and a few MOSFETs. Extremely simple, but [Debasish] is connecting the entire controller to the ...