Rate & section control to replace raven 440

Hardware PCB
1

Howdy from the Midwest.
I have been doing some reading trying to figure out what I need to order for the rate control portion.
What would be the best RC PCB to use? I already have a separate relay board, cytron MD13S, voltage converter, nano, nano shield.
Do I understand correctly that I need 2 separate nanos? one for rate and one for section control.
The smaller the PCB is the better, as my goal is to put this in the 440 case.

Auto steer setup is V2 board, f9p ardusimple running with nano shields to ethernet switch.

Thank You for any input.

2

The smallest and least expensive is the RC12-2. It is all through-hole parts so it needs to be hand soldered. It can do rate control and section control using another small board mounted on a 8 or 16 sections relay module. Here is an overview of the boards: GitHub - AgHardware/Rate_Control

3

The relay module I have is Amazon.com: NOYITO 6-Channel Relay Module 5V 12V 24V High Low Level Trigger with Optocoupler Isolation Relay Load AC 250V 10A DC 30V 10A (DC 5V, Blue) : Industrial & Scientific will this work or do I need to get an 8 section?

4

It needs dupont pins to work with the relay driver board. One like this: Amazon.com: ELEGOO 8 Channel DC 5V Relay Module with Optocoupler Compatible with Arduino UNO R3 MEGA 1280 DSP ARM PIC AVR STM32 : Electronics

The relay driver board is connected to RC12-2 with a qwiic to dupont cable like the ones on this page: I2C Qwiic Cable Kit Stemma QT Wire for SparkFun Development Boards Sensor Board Breakout Breadboard 4 Pin Sh1.0 Connector : Amazon.ca: Electronics