The RX line was already used by the uC on the Re:Load Pro, and I didn't wanted to interrupt any communication from the load to the PC. And the idea I got was to make the control variables customizable via the USB interface. This expansion slot have both power and TX and RX from the FTDI chip, and it got me to thinking whether the UART interface could be used to something useful.
It uses the expansion slot on the PCB, so no need to hack to get the fan controller PCB connected to the Re:Load Pro pcb.
This project is a guide or inspiration to make your own fan controller to your Re:Load Pro.
